Apollo - Blog Posts

One Giant Leap for Mankind

Millions of people around the globe will come together for the Paris 2024 Olympic Games later this month to witness a grand event—the culmination of years of training and preparation.

Fifty-five years ago this July, the world was watching as a different history-changing event was unfolding: the Apollo 11 mission was landing humans on the surface of another world for the first time. An estimated 650 million people watched on TV as Neil Armstrong reached the bottom of the ladder of the lunar module on July 20, 1969, and spoke the words, “That’s one small step for [a] man, one giant leap for mankind.”

While the quest to land astronauts on the Moon was born from the space race with the Soviet Union during the Cold War, this moment was an achievement for the whole of humanity. To mark the world-embracing nature of the Moon landing, several tokens of world peace were left on the Moon during the astronauts’ moonwalk.

“We came in peace for all mankind”

These words, as well as drawings of Earth’s western and eastern hemispheres, are etched on a metal plaque affixed to a leg of the Apollo 11 lunar lander. Because the base of the lander remained on the Moon after the astronauts returned, it is still there today as a permanent memorial of the historic landing.

Microscopic messages from kings, queens, and presidents

Another artifact left on the Moon by the Apollo 11 astronauts is a small silicon disc etched with goodwill messages from leaders of 74 countries around the world. Each message was reduced to be smaller than the head of a pin and micro-etched on a disc roughly 1.5 inches (3.8 cm) in diameter. Thailand’s message, translated into English, reads: "The Thai people rejoice in and support this historic achievement of Earth men, as a step towards Universal peace."

Curious to read what else was inscribed on the disk? Read the messages.

An ancient symbol

The olive branch, a symbol of peace and conciliation in ancient Greek mythology, also found its way to the Moon in July 1969. This small olive branch made of gold was left on the lunar surface during Neil Armstrong and Buzz Aldrin’s 2.5-hour moonwalk. The olive branch also featured on the Apollo 11 mission patches sewed on the crew’s spacesuits. Designed in part by command module pilot Michael Collins, the insignia shows a bald eagle landing on the Moon holding an olive branch in its talons.

We go together

As NASA’s Artemis program prepares to again land astronauts on the Moon, including the first woman and the first person of color, this time we’re collaborating with commercial and international partners. Together we will make new scientific discoveries, establish the first long-term presence on the Moon, and inspire a new generation of explorers.

Is aerospace history your cup of tea? Be sure to check out more from NASA’s past at www.nasa.gov/history.

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Moonbound: One Year Since Artemis I

On this day last year, the Artemis I rocket and spacecraft lit up the sky and embarked on the revolutionary mission to the Moon and back. The first integrated flight test of the rocket and spacecraft continued for 25.5 days, validating NASA’s deep exploration systems and setting the stage for humanity’s return to the lunar surface.

On Nov. 16, 2022, the Space Launch System (SLS) rocket met or exceeded all expectations during its debut launch on Artemis I. The twin solid rocket booster motors responsible for producing more than 7 million pounds of thrust at liftoff reached their performance target, helping SLS and the Orion spacecraft reach a speed of about 4,000 mph in just over two minutes before the boosters separated.

Quite a few payloads caught a ride aboard the Orion spacecraft on the Artemis I mission: In addition to a number of small scientific satellites called CubeSats, a manikin named Commander Moonikin Campos sat in the commander’s seat. A Snoopy doll served as a zero-gravity indicator — something that floats inside the spacecraft to demonstrate microgravity. 

During the mission, Orion performed two lunar flybys, coming within 80 miles of the lunar surface. At its farthest distance during the mission, Orion traveled nearly 270,000 miles from our home planet, more than 1,000 times farther than where the International Space Station orbits Earth. This surpassed the record for distance traveled by a spacecraft designed to carry humans, previously set during Apollo 13.

The Orion spacecraft arrived back home to planet Earth on Dec. 11, 2022. During re-entry, Orion endured temperatures about half as hot as the surface of the Sun at about 5,000 degrees Fahrenheit. Within about 20 minutes, Orion slowed from nearly 25,000 mph to about 20 mph for its parachute-assisted splashdown. 

Recovery teams successfully retrieved the spacecraft and delivered it back to NASA’s Kennedy Space Center for de-servicing operations, which included removing the payloads (like Snoopy and Commander Moonikin Campos) and analyzing the heat shield.  

With the Artemis I mission under our belt, we look ahead to Artemis II — our first crewed mission to the Moon in over 50 years. Four astronauts will fly around the Moon inside Orion, practicing piloting the spacecraft and validating the spacecraft’s life support systems. The Artemis II crew includes: NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, and CSA astronaut Jeremy Hansen. 

As we look ahead to Artemis II, we build upon the incredible success of the Artemis I mission and recognize the hard work and achievements of the entire Artemis team. Go Artemis!

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The Adventures of Commander Moonikin Campos

Artemis I will be an enormous step toward humanity’s return to the Moon. This mission will be the first flight test of the integrated Space Launch System rocket and the Orion spacecraft — the same system that will send future Artemis astronauts to the Moon. That’s why NASA needs someone capable to test the vehicle. Someone with the necessary experience. Someone with the Right Stuff. (Or... stuffing).

Meet Commander Moonikin Campos. He is a manikin, or a replica human body. Campos is named after Arturo Campos, a trailblazing NASA employee who worked on Apollo missions. Arturo Campos’ skill as an electrical engineer was pivotal in the rescue efforts to help guide the Apollo 13 astronauts home.

As the leader of the mission, Commander Campos will be flying in the pilot’s seat for the length of the mission: a journey of 1.3 million miles (~2 million km) around the Moon and back to Earth. He's spent years training for this mission and he loves a challenge. Campos will be equipped with two radiation sensors and will have additional sensors under his headrest and behind his seat to record acceleration and vibration data throughout the mission.

Traveling with Campos are his quirky companions, Zohar and Helga. They’re part of a special experiment to measure radiation outside of the protective bubble of Earth’s atmosphere. Together with their commander, they’re excited to play a role in humanity’s next great leap. (And hopefully they can last the entire flight without getting on each other's nerves.)

Will our brave explorers succeed on their mission and ensure the success of future Artemis operations? Can Commander Moonikin Campos live up to the legacy of his heroic namesake?? And did anyone remember to bring snacks??? Get the answers in this thrilling three-part series!

In the first part of Commander Moonikin Campos’ journey, our trailblazing hero prepares for liftoff from NASA’s spaceport at Kennedy Space Center  in Florida, gets acquainted with the new hardware aboard the Orion spacecraft, and meets his crewmates: Helga and Zohar!

In the second part of the trio’s adventure, Campos, Helga, and Zohar blast out of the Earth’s atmosphere with nearly 8.8 million pounds (4 million kg) of thrust powering their ascent. Next stop: the Moon!

In the final chapter of the Artemis I mission, Campos and friends prepare for their return home, including the last and most dangerous part of their journey: reentering Earth’s atmosphere at a screeching 25,000 miles per hour (40,000 kph).

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Congratulations to the Winner of the Name the Artemis Moonikin Challenge!

Congratulations to Campos! After a very close competition among eight different names, the people have decided: Commander Moonikin Campos is launching on Artemis I, our first uncrewed flight test of the Space Launch System rocket and Orion spacecraft around the Moon later this year.

The name Campos is a dedication to Arturo Campos, electrical power subsystem manager for the Apollo 13 lunar module. He is remembered as not only a key player instrumental to the Apollo 13 crew’s safe return home, but as a champion for equality in the workplace. The final bracket challenge was between Campos and Delos, a reference to the island where Apollo and Artemis were born, according to Greek mythology.

The Moonikin is a male-bodied manikin previously used in Orion vibration tests. Campos will occupy the commander’s seat inside and wear a first-generation Orion Crew Survival System — a spacesuit Artemis astronauts will wear during launch, entry, and other dynamic phases of their missions. Campos' seat will be outfitted with sensors under the headrest and behind the seat to record acceleration and vibration data throughout the mission. Data from the Moonikin’s experience will inform us how to protect astronauts during Artemis II, the first mission around the Moon with crew in more than 50 years.

The Moonikin is one of three passengers flying in place of crew aboard Orion on the mission to test the systems that will take astronauts to the Moon for the next generation of exploration. Two female-bodied model human torsos, called phantoms, will also be aboard Orion. Zohar and Helga, the phantoms named by the Israel Space Agency and the German Aerospace Center respectively, will support an investigation called the Matroshka AstroRad Radiation Experiment to provide data on radiation levels during lunar missions.

Campos, Zohar, and Helga are really excited to begin the journey around the Moon and back. The Artemis I mission will be one of the first steps to establishing a long-term presence on and around the Moon under Artemis, and will help us prepare for humanity's next giant leap — sending the first astronauts to Mars.

Be sure to follow Campos, Zohar, and Helga on their journey by following @NASAArtemis on Facebook, Twitter, and Instagram. Make sure to follow us on Tumblr for your regular dose of space!

Name the Artemis Moonikin!

Choose your player!

As we gear up for our Artemis I mission to the Moon — the mission that will prepare us to send the first woman and the first person of color to the lunar surface — we have an important task for you (yes, you!). Artemis I will be the first integrated test flight of the Space Launch System (SLS) rocket and the Orion crew capsule. Although there won’t be any humans aboard Orion, there will be a very important crewmember: the Moonikin!

The Moonikin is a manikin, or anatomical human model, that will be used to gather data on the vibrations that human crewmembers will experience during future Artemis missions. But the Moonikin is currently missing something incredibly important — a name!

There are eight names in the running, and each one reflects an important piece of NASA’s past or a reference to the Artemis program:

1. ACE

ACE stands for Artemis Crew Explorer. This is a very practical name, as the Moonikin will be a member of the first official “crew” aboard Artemis I.

The Moonikin will occupy the commander’s seat inside Orion, be equipped with two radiation sensors, and wear a first-generation Orion Crew Survival System suit—a spacesuit astronauts will wear during launch, entry, and other dynamic phases of their missions. The Moonikin will also be accompanied by phantoms, which are manikins without arms or legs: Zohar from the Israel Space Agency and Helga from the German Aerospace Center. Zohar and Helga will be participating in an investigation called the Matroshka AstroRad Radiation Experiment, which will provide valuable data on radiation levels experienced during missions to the Moon.

2. Campos

Campos is a reference to Arturo Campos, an electrical engineer at NASA who was instrumental to bringing the Apollo 13 crew safely back home.

Apollo 13 was on its way to attempt the third Moon landing when an oxygen tank exploded and forced the mission to abort. With hundreds of thousands of miles left in the journey, mission control teams at Johnson Space Center were forced to quickly develop procedures to bring the astronauts back home while simultaneously conserving power, water, and heat. Apollo 13 is considered a “successful failure,” because of the experience gained in rescuing the crew. In addition to being a key player in these efforts, Campos also established and served as the first president of the League of United Latin American Citizens Council 660, which was composed of Mexican-American engineers at NASA.

3. Delos

On June 26, 2017, our Terra satellite captured this image of the thousands of islands scattered across the Aegean Sea. One notable group, the Cyclades, sits in the central region of the Aegean. They encircle the tiny, sacred island of Delos.

According to Greek mythology, Delos was the island where the twin gods Apollo and Artemis were born.

The name is a recognition of the lessons learned during the Apollo program. Dr. Abe Silverstein, former director of NASA’s Glenn Research Center, said that he chose the name “Apollo” for the NASA's first Moon landing program because image of "Apollo riding his chariot across the Sun was appropriate to the grand scale of the proposed program." Between 1969 and 1972, we successfully landed 12 humans on the lunar surface — providing us with invaluable information as the Artemis program gears up to send the first woman and the first person of color to the Moon.

4. Duhart

Duhart is a reference to Dr. Irene Duhart Long, the first African American woman to serve in the Senior Executive Service at Kennedy Space Center. As chief medical officer at the Florida spaceport, she was the first woman and the first person of color to hold that position. Her NASA career spanned 31 years.

Working in a male-dominated field, Long confronted — and overcame — many obstacles and challenges during her decorated career. She helped create the Spaceflight and Life Sciences Training Program at Kennedy, in partnership with Florida Agricultural and Mechanical University, a program that encouraged more women and people of color to explore careers in science.

5. Montgomery

Montgomery is a reference to Julius Montgomery, the first African American ever hired at the Cape Canaveral Air Force Station to work as a technical professional. After earning a bachelor's degree at Tuskegee Institute in Alabama, Montgomery served in the U.S. Air Force, where he earned a first class radio-telescope operator's license. Montgomery began his Cape Canaveral career in 1956 as a member of the “Range Rats,” technicians who repaired malfunctioning ballistic missiles.

Montgomery was also the first African American to desegregate and graduate from Brevard Engineering College, now the Florida Institute of Technology in Melbourne, Florida.

6. Rigel

Rigel is one of the 10 brightest stars in Earth's sky and forms part of the familiar constellation Orion. The blue supergiant is about 860 light-years from Earth.

The reference to Rigel is a nod toward the Orion spacecraft, which the Moonikin (and future Artemis astronauts!) will be riding aboard. Built to take humans farther than they’ve ever gone before, the Orion spacecraft will serve as the exploration vehicle that will carry crew into space and provide safe re-entry back to Earth.

7. Shackleton

Shackleton Crater is a crater on the Moon named after the Antarctic explorer, Ernest Shackleton. The interior of the crater receives almost no direct sunlight, which makes it very cold — the perfect place to find ice. Our Lunar Reconnaissance Orbiter spacecraft (LRO) returned data that ice may make up as much as 22% of the surface material in Shackleton!

Shackleton Crater is unique because even though most of it is permanently shadowed, three points on the rim remain collectively sunlit for more than 90% of the year. The crater is a prominent feature at the Moon’s South Pole, a region where NASA plans to send Artemis astronauts on future missions.

8. Wargo

Wargo is a reference to Michael Wargo, who represented NASA as the first Chief Exploration Scientist for the Human Exploration and Operations Mission Directorate at NASA Headquarters. He was a leading contributor to the Lunar Reconnaissance Orbiter and the Lunar Crater Observation and Sensing Satellite (LCROSS), which launched together on to the Moon and confirmed water existed there in 2009.

Throughout his time as an instructor at MIT and his 20-year career at NASA, Wargo was known as a science ambassador to the public, and for his ability to explain complex scientific challenges and discoveries to less technical audiences. Following his sudden death in 2013, the International Astronomical Union posthumously named a crater on the far side of the Moon in his honor.

Want to participate in the naming contest? Make sure you are following @NASAArtemis on Twitter, Facebook, and Instagram to get notified about the bracket challenges between June 16 and June 28! Learn more about the Name the Artemis Moonikin Challenge here.

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From Apollo to Commercial Crew: Get To Know Historic Launch Pad 39A

Originally built for the massive Saturn V rockets that sent astronauts on Apollo missions to the Moon, Launch Complex 39A also served as one of the two launch pads used by the space shuttle. Between Apollo, Skylab, Apollo-Soyuz and the space shuttle, this launch pad has been the starting point for many of the nation’s most challenging and inspiring missions.

In 2014, SpaceX signed a property agreement with NASA for use and operation of the launch complex for 20 years, and the company modified the facility to prepare for the processing and launch of its Falcon 9 and Falcon Heavy rockets.

The SpaceX Falcon 9 rocket carrying the company’s Crew Dragon on its Demo-2 flight test to the International Space Station with NASA astronauts Robert Behnken and Douglas Hurley will lift off from the same historic site where astronauts first launched to the moon. Launch Complex 39A at NASA’s Kennedy Space Center in Florida is also the site of dozens of space shuttle launches that helped build the orbital laboratory.

Launch Complexes 39A and B were constructed in the 1960s. Both launch pads have a long history of supporting launches for the Apollo and Space Shuttle Programs. Launch Pad 39A was the launch site for 11 Saturn V Apollo missions, including Apollo 11, the first Moon landing. The pad also was the launch site for 82 space shuttle missions, including STS-1, the first shuttle launch, the STS-125 final servicing mission for the Hubble Space Telescope, and STS-135, the final shuttle mission.

After the space shuttle was retired in 2011, we began the process to transform Kennedy Space Center from a historically government-only launch facility into a multi-user spaceport for both government and commercial use. On April 14, 2014, the agency signed a property agreement with SpaceX for use of the launch site for the next 20 years.

SpaceX upgraded and modified the launch pad to support its Falcon 9 and Falcon Heavy rockets. The company also built a horizontal processing hangar at the base of the pad to perform final vehicle integration prior to flight. The first SpaceX launch from the pad was the company’s 10th commercial resupply services (CRS-10) mission for us. A SpaceX Falcon 9 launched a Dragon cargo spacecraft on CRS-10 on Feb. 19, 2017. The Dragon delivered about 5,500 pounds of supplies to the space station, including the Stratospheric Aerosol and Gas Experiment (SAGE) III instrument to further study ozone in the Earth’s atmosphere. Combined with SpaceX, we’ve launched more than 100 missions from Pad 39A.

Because of our partnership with SpaceX within our agency’s Commercial Crew Program, Launch Complex 39A will once again be the site of crewed missions to the space station.

🚀 TUNE IN starting at 12:15 p.m. EDT on Wednesday, May 27 as NASA and SpaceX launch astronauts Robert Behnken and Douglas Hurley to the International Space Station aboard the Crew Dragon spacecraft: www.nasa.gov.live.

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Mathematician. Leader. Heroine. Remembering Hidden Figure Katherine Johnson

Tonight, count the stars and remember a trailblazer. 

We're saddened by the passing of celebrated #HiddenFigures mathematician Katherine Johnson. She passed away at 101 years old. 

An America hero, Johnson's legacy of excellence broke down racial and social barriers while helping get our space agency off the ground.

Once a "human computer", she famously calculated the flight trajectory for Alan Shepard, the first American in space.

And when we began to use electronic computers for calculations, astronaut John Glenn said that he’d trust the computers only after Johnson personally checked the math.

As a girl, Katherine Johnson counted everything. As a mathematician, her calculations proved critical to our early successes in space travel.

With slide rules and pencils, Katherine Johnson’s brilliant mind helped launch our nation into space. No longer a Hidden Figure, her bravery and commitment to excellence leaves an eternal legacy for us all.

"We will always have STEM with us. Some things will drop out of the public eye and will go away, but there will always be science, engineering and technology. And there will always, always be mathematics." - Katherine Johnson 1918 -2020 

May she rest in peace, and may her powerful legacy inspire generations to come! What does Katherine Johnson’s legacy mean to you? Share in the comments. 

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Apollo 12: The Next Step after the Giant Leap

Launched less than four months after Apollo 11 put the first astronauts on the Moon, Apollo 12 was more than a simple encore. After being struck by lightning on launch -- to no lasting damage, fortunately -- Apollo 12 headed for a rendezvous with a spacecraft that was already on the Moon. The mission would expand the techniques used to explore the Moon and show the coordination between robotic and human exploration, both of which continue today as we get return to return astronauts to the Moon by 2024. 

Launch Day

Apollo 12 lifted off at 11:22 a.m. EST, Nov. 14, 1969, from our Kennedy Space Center. Aboard the Apollo 12 spacecraft were astronauts Charles Conrad Jr., commander; Richard F. Gordon Jr., command module pilot; and Alan L. Bean, lunar module pilot.

Barely 40 seconds after liftoff, lightning struck the spacecraft. Conrad alerted Houston that the crew had lost telemetry and other data from the mission computers. As the Saturn V engines continued to push the capsule to orbit, ground controllers worked out a solution, restarting some electrical systems, and Apollo 12 headed toward the Moon.

Cameras at the Kennedy Space Center captured this image of the same lightning bolt that struck Apollo 12 striking the mobile platform used for the launch.

On the Moon

Apollo 12 landed on the Moon on Nov. 19, and on the second moonwalk Conrad and Bean walked approximately 200 yards to the Surveyor 3 spacecraft. One of seven Surveyor spacecraft sent to land on the Moon and to gather data on the best way to land humans there, Surveyor 3 had been on the Moon for more than two years, exposed to cosmic radiation and the vacuum of space. Scientists on the ground wanted to recover parts of the spacecraft to see what effects the environment had had on it.

Apollo 12 commander Pete Conrad examines the Surveyor 3 spacecraft before removing its camera and other pieces for return to Earth. In the background is the lunar module that landed Conrad and lunar module pilot Alan Bean on the Moon.

Splashdown

Apollo 12 splashed down on Nov. 24. When Artemis returns astronauts to the Moon in 2024, it will be building on Apollo 12 as much as any of the other missions. Just as Apollo 12 had to maneuver off the standard “free return” trajectory to reach its landing site near Surveyor, Artemis missions will take advantage of the Gateway to visit a variety of lunar locations. The complementary work of Surveyor and Apollo -- a robotic mission preparing the way for a crewed mission; that crewed mission going back to the robotic mission to learn more from it -- prefigures how Artemis will take advantage of commercial lunar landers and other programs to make lunar exploration sustainable over the long term.

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High (Like 240,000 Miles) Fashion: What Astronauts Wear to the Moon

We call it a spacesuit, almost as if it’s something an astronaut pulls out of the closet. It’s more accurate to think of it as an astronaut’s personal spacecraft: self-contained and functional, with a design focused on letting astronauts work safely in space. Just as we’ve been able to improve rockets, satellites and data systems over 60 years, we’ve made great improvements to spacesuits.

When the first woman and next man step foot on the Moon in 2024, they will be wearing the next generation of spacesuit, called the Exploration Extravehicular Mobility Unit, or xEMU for short. The new suit can be used under different conditions for various tasks, including walking, driving rovers or collecting samples. The design will also allow the suits to be used for spacewalks on the space station, or Gateway – our upcoming spaceship that will orbit the Moon. Future missions to Mars can build on the core suit technologies with additional upgrades for use in the Martian atmosphere and greater gravity.

60 Years of Improvements

Even before we had astronauts, pilots were using pressurized suits to fly at high speeds at altitudes where the air was too thin to breathe. Our first spacesuits – shown here worn by the first NASA astronauts in 1959 – were variations of the suit used by Navy test pilots.

The Gemini spacesuit – shown here in a photo of astronaut Ed White making the first American spacewalk in 1965  – added a line that could connect the astronaut to the spacecraft for oxygen, and which also served as a tether when they left the capsule for a spacewalk.

The Apollo astronauts had to completely separate themselves from the lunar module, so we added a portable life support unit, which the astronauts carried on their backs. The photo above shows the life support system on the suit of Apollo 11 astronaut Buzz Aldrin as he deploys lunar experiments in 1969.

Though the bulky suits weren’t exactly easy to maneuver, astronauts still managed to get their jobs done and enjoy themselves doing it.

A Great Moment in Spacesuit History: Singing on the Moon

What, you wouldn’t sing if you were on the moon?

Different Suits for Different Functions

We have used different suits for different purposes. During the Space Shuttle program, astronauts inside the shuttle wore these orange “pumpkin” suits, which were designed to be worn within the cabin. 

On spacewalks, special suits – made to be worn only outside the spacecraft – provided high mobility, more flexibility and life support as the astronauts worked in zero gravity.

During construction of the International Space Station, we should have issued a hard hat and a pair of steel-toed boots with each suit. Astronauts conducted more than 200 spacewalks as part of building the station, which took place from 1998 until 2011. Above, an astronaut at the end of the shuttle’s robotic arm is maneuvered back into the shuttle’s payload bay with a failed pump during the shuttle’s final flight in 2011.

#MissionAccomplished

Spacesuits are rarely the story themselves, but they make it possible for our astronauts to get their jobs done, even when they have to improvise. In the picture above, astronauts on a 1992 space shuttle mission are conducting a spacewalk they hadn’t originally planned on. The crew was originally supposed to use a specially designed grab bar to capture the INTELSAT VI satellite. Two attempts to use the grab bar on two-person spacewalks failed, so we improvised a plan to add a third spacewalker and have all three go outside and literally grab the satellite.

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10 Ways to Observe the Moon for International Observe the Moon Night

On Saturday, October 5, we will host the 10th annual International Observe the Moon Night. One day each year, everyone on Earth is invited to observe and learn about the Moon together, and to celebrate the cultural and personal connections we all have with our nearest celestial neighbor! This year is particularly special as we mark the 50th anniversary of the Apollo 11 Moon landing while looking forward to our Artemis program, which will send the first woman and next man to the Moon.

There are many ways to participate in International Observe the Moon Night. You can attend an event, host your own or just look up! Here are 10 of our favorite ways to observe the Moon.

1. Look up

Image Credit: NASA’s Scientific Visualization Studio/Ernie Wright

The simplest way to observe the Moon is simply to look up. The Moon is the brightest object in our night sky, the second brightest in our daytime sky and can be seen from all around the world — from the remote and dark Atacama Desert in Chile to the brightly lit streets of Tokyo. On October 5, we have a first quarter Moon, which means that the near side of the Moon will be 50 percent illuminated. The first quarter Moon is a great phase for evening observing. Furthermore, the best lunar observing is typically along the Moon's terminator (the line between night and day) where shadows are the longest, rather than at full Moon. See the Moon phase on October 5 or any other day of the year!

2. Peer through a telescope or binoculars

Image Credit: NASA/Molly Wasser

With some magnification help, you will be able to focus in on specific features on the Moon. In honor of this year’s 50th Anniversary of the Apollo 11 Moon Landing, see if you can find Mare Tranquillitatis (Sea of Tranquility)! Download our Moon maps for some guided observing on Saturday.

3. Photograph the Moon

Image Credit: NASA/GSFC/Arizona State University

Our Lunar Reconnaissance Orbiter (LRO) has taken more than 20 million images of the Moon, mapping it in stunning detail. You can see featured, captioned images on LRO’s camera website, like the crater seen above. And, of course, you can take your own photos from Earth. Check out our tips on photographing the Moon!

4. Relax on your couch

Image Credit: NASA’s Scientific Visualization Studio/Ernie Wright

Is it cloudy? Luckily, you can observe the Moon from the comfort of your own home. The Virtual Telescope Project will livestream the Moon from above the Roman skyline. Or, you can take and process your own lunar images with the MicroObservatory Robotic Telescopes. Would you prefer a movie night? There are many films that feature our nearest neighbor. Also, you can spend your evening with our lunar playlist on YouTube or this video gallery, learning about the Moon’s role in eclipses, looking at the Moon phases from the far side and seeing the latest science portrayed in super high resolution.

5. Touch the topography

Image Credit: NASA GSFC/Jacob Richardson

Observe the Moon with your hands! If you have access to a 3D printer, you can peruse our library of 3D models and lunar landscapes. This collection of Apollo resources features 3D models of the Apollo landing sites using topographic data from LRO and the SELENE mission. The 3D printed model you see above is of the Ina D volcanic landform.

6. Make and admire Moon art

Image Credit: LPI/Andy Shaner

Enjoy artwork of the Moon and create your own! For messy fun, lunar crater paintings demonstrate how the lunar surface changes due to frequent meteorite impacts.

7. Listen to the Moon

Image Credit: NASA Explorers: Apollo/System Sounds

Treat your ears this International Observe the Moon Night. Our audio series, NASA Explorers: Apollo features personal stories from the Apollo era to now, including yours! You can participate by recording and sharing your own experiences of Apollo with us. Learn some lunar science with the second season of our Gravity Assist podcast with NASA Chief Scientist, Jim Green. Make a playlist of Moon-themed songs. For inspiration, check out this list of lunar tunes. We also recommend LRO’s official music video, The Moon and More, featuring Javier Colon, season 1 winner of NBC’s “The Voice.” Or you can watch this video featuring “Clair de Lune,” by French composer Claude Debussy, over and over.

8. Take a virtual field trip

Image Credit: NASA/SSERVI

Plan a lunar hike with Moon Trek. Moon Trek is an interactive Moon map made using NASA data from our lunar spacecraft. Fly anywhere you’d like on the Moon, calculate the distance or the elevation of a mountain to plan your lunar hike, or layer attributes of the lunar surface and temperature. If you have a virtual reality headset, you can experience Moon Trek in 3D.  

9. See the Moon through the eyes of a spacecraft

Image Credit: NASA/GSFC/MIT

Visible light is just one tool that we use to explore our universe. Our spacecraft contain many different types of instruments to analyze the Moon’s composition and environment. Review the Moon’s gravity field with data from the GRAIL spacecraft or decipher the maze of this slope map from the laser altimeter onboard LRO. This collection from LRO features images of the Moon’s temperature and topography. You can learn more about the different NASA missions to explore the Moon here.

10. Continue your observations throughout the year

Image Credit: NASA’s Scientific Visualization Studio/Ernie Wright

An important part of observing the Moon is to see how it changes over time. International Observe the Moon Night is the perfect time to start a Moon journal. See how the shape of the Moon changes over the course of a month, and keep track of where and what time it rises and sets. Observe the Moon all year long with these tools and techniques!

However you choose to celebrate International Observe the Moon Night, we want to hear about it! Register your participation and share your experiences on social media with #ObserveTheMoon or on our Facebook page. Happy observing!

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Celebrating Women’s Equality Day Across NASA

August 26 is celebrated in the United States as Women’s Equality Day. On this day in 1920, the Nineteenth Amendment was signed into law and American women were granted the constitutional right to vote. The suffragists who fought hard for a woman’s right to vote opened up doors for trailblazers who have helped shape our story of spaceflight, research and discovery. On Women’s Equality Day, we celebrate women at NASA who have broken barriers, challenged stereotypes and paved the way for future generations. This list is by no means exhaustive. 

Rocket Girls and the Advent of the Space Age

In the earliest days of space exploration, most calculations for early space missions were done by “human computers,” and most of these computers were women. These women's calculations helped the U.S. launch its first satellite, Explorer 1. This image from 1953, five years before the launch of Explorer 1, shows some of those women on the campus of the Jet Propulsion Laboratory (JPL).

These women were trailblazers at a time when most technical fields were dominated by white men. Janez Lawson (seen in this photo), was the first African American hired into a technical position at JPL. Having graduated from UCLA with a bachelor's degree in chemical engineering, she later went on to have a successful career as a chemical engineer.

Katherine Johnson: A Champion for Women’s Equality

Mathematician Katherine Johnson, whose life story was told in the book and film "Hidden Figures," is 101 years old today! Coincidentally, Johnson’s birthday falls on August 26: which is appropriate, considering all the ways that she has stood for women’s equality at NASA and the country as a whole.

Johnson began her career in 1953 at the National Advisory Committee for Aeronautics (NACA), the agency that preceded NASA, one of a number of African-American women hired to work as "human computers.” Johnson became known for her training in geometry, her leadership and her inquisitive nature; she was the only woman at the time to be pulled from the computing pool to work with engineers on other programs.

Johnson was responsible for calculating the trajectory of the 1961 flight of Alan Shepard, the first American in space, as well as verifying the calculations made by electronic computers of John Glenn’s 1962 launch to orbit and the 1969 Apollo 11 trajectory to the moon. She was awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by President Barack Obama on Nov. 24, 2015.

JoAnn Morgan: Rocket Fuel in Her Blood 

JoAnn Morgan was an engineer at Kennedy Space Center at a time when the launch room was crowded with men. In spite of working for all of the Mercury, Gemini and Apollo programs, and being promoted to a senior engineer, Morgan was still not permitted in the firing room at liftoff — until Apollo 11, when her supervisor advocated for her because of her superior communication skills. Because of this, Morgan was the instrumentation controller — and the only woman — in the launch room for the Apollo 11 liftoff. 

Morgan’s career at NASA spanned over 45 years, and she continued to break ceiling after ceiling for women involved with the space program. She excelled in many other roles, including deputy of Expendable Launch Vehicles, director of Payload Projects Management and director of Safety and Mission Assurance. She was one of the last two people who verified the space shuttle was ready to launch and the first woman at KSC to serve in an executive position, associate director of the center.

Oceola (Ocie) Hall: An Advocate for NASA Women 

Oceola Hall worked in NASA’s Office of Diversity and Equal Opportunity for over 25 years. She was NASA’s first agency-wide Federal Women’s program manager, from 1974 – 1978. Hall advanced opportunities for NASA women in science, engineering and administrative occupations. She was instrumental in initiating education programs for women, including the Simmons College Strategic Leadership for Women Program.

Hall’s outstanding leadership abilities and vast knowledge of equal employment laws culminated in her tenure as deputy associate administrator for Equal Opportunity Programs, a position she held for five years. Hall was one among the first African-American women to be appointed to the senior executive service of NASA. This photo was taken at Marshall during a Federal Women’s Week Luncheon on November 11, 1977 where Hall served as guest speaker.

Hall was known for saying, “You have to earn your wings every day.”

Sally Ride: Setting the Stage for Women in Space

The Astronaut Class of 1978, otherwise known as the “Thirty-Five New Guys,” was NASA’s first new group of astronauts since 1969. This class was notable for many reasons, including having the first African-American and first Asian-American astronauts and the first women.

Among the first women astronauts selected was Sally Ride. On June 18, 1983, Ride became the first American woman in space, when she launched with her four crewmates aboard the Space Shuttle Challenger on mission STS-7. On that day, Ride made history and paved the way for future explorers.

When those first six women joined the astronaut corps in 1978, they made up nearly 10 percent of the active astronaut corps. In the 40 years since that selection, NASA selected its first astronaut candidate class with equal numbers of women and men, and women now comprise 34 percent of the active astronauts at NASA.

Charlie Blackwell-Thompson: First Female Launch Director 

As a part of our Artemis missions to return humans to the Moon and prepare for journeys to Mars, the Space Launch System, or SLS, rocket will carry the Orion spacecraft on an important flight test. Veteran spaceflight engineer Charlie Blackwell-Thompson will helm the launch team at Kennedy Space Center in Florida. Her selection as launch director means she will be the first woman to oversee a NASA liftoff and launch team.

"A couple of firsts here all make me smile," Blackwell-Thompson said. "First launch director for the world's most powerful rocket — that's humbling. And I am honored to be the first female launch director at Kennedy Space Center. So many amazing women that have contributed to human space flight, and they blazed the trail for all of us.”

The Future of Women at NASA

In this image, NASA astronauts Anne McClain and Christina Koch pose for a portrait inside the Kibo laboratory module on the International Space Station. Both Expedition 59 flight engineers are members of NASA's 2013 class of astronauts.   

As we move forward as a space agency, embarking on future missions to the Moon, Mars and beyond, we reflect on the women who blazed the trail and broke glass ceilings. Without their perseverance and determination, we would not be where we are today.

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5 Out-of-this-world Facts About Our Iconic Vehicle Assembly Building!

The Vehicle Assembly Building, or VAB, at our Kennedy Space Center in Florida, is the only facility where assembly of a rocket occurred that carried humans beyond low-Earth orbit and on to the Moon. For 30 years, its facilities and assets were used during the Space Shuttle Program and are now available to commercial partners as part of our agency’s plan in support of a multi-user spaceport. To celebrate the VAB’s continued contribution to humanity’s space exploration endeavors, we’ve put together five out-of-this-world facts for you!

1. It’s one of the largest buildings in the world by area, the VAB covers eight acres, is 525 feet tall and 518 feet wide.

Aerial view of the Vehicle Assembly Building with a mobile launch tower atop a crawler transporter approaching the building. 

2. The VAB was constructed for the assembly of the Apollo/Saturn V Moon rocket, the largest rocket made by humans at the time.

An Apollo/Saturn V facilities Test Vehicle and Launch Umbilical Tower (LUT) atop a crawler-transporter move from the Vehicle Assembly Building (VAB) on the way to Pad A on May 25, 1966. 

3. The building is home to the largest American flag, a 209-foot-tall, 110-foot-wide star spangled banner painted on the side of the VAB.

Workers painting the Flag on the Vehicle Assembly Building on January 2, 2007.

4. The tallest portions of the VAB are its 4 high bays. Each has a 456-foot-high door. The doors are the largest in the world and take about 45 minutes to open or close completely.

A mobile launcher, atop crawler-transporter 2, begins the move into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018.

5. After spending more than 50 years supporting our human spaceflight programs, the VAB received its first commercial tenant – Northrop Grumman Corporation – on August 16, 2019!

A model of Northrop Grumman’s OmegA launch vehicle is flanked by the U.S. flag and a flag bearing the OmegA logo during a ribbon-cutting ceremony Aug. 16 in High Bay 2 of the Vehicle Assembly Building.

Whether the rockets and spacecraft are going into Earth orbit or being sent into deep space, the VAB will have the infrastructure to prepare them for their missions.  

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“I felt I was an accepted team member. It was a great experience and a unique opportunity.”

Ruth Ann Strunk, a math major, was hired in 1968 at NASA’s Kennedy Space Center as an acceptance checkout equipment software engineer. She monitored the work of contractors who wrote the computer programs designed to check out the command module, lunar module and the Apollo J mission experiments. These experiments were conducted aboard the service modules on Apollo 15, 16 and 17 by the command module pilots. 

“I am proud of the advancement and the number of women who are working and enjoy working here,” Strunk said. “It was a wonderful opportunity NASA afforded me during Apollo that I have been able to use ever since.”

Remember the women who made #Apollo50th possible.

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Out of the Lab and Into the Air

As we celebrate the 50th anniversary of the first Apollo Moon landing, remember that many Apollo astronauts, including Neil Armstrong, the first person on the Moon, were test pilots who flew experimental planes for NASA in our earliest days. Since long before we landed on the Moon, aeronautics has been a key piece of our mission.

The U.S. founded the National Advisory Committee on Aeronautics (NACA), our predecessor, in 1914. NACA, collaborating with the U.S. Air Force, pioneered the X-1 aircraft, the first crewed plane to achieve supersonic speeds. NACA was largely responsible for turning the slow, cloth-and-wood biplanes of the early 1900s into the sleek, powerful jets of today.

When NACA was absorbed by the newly formed NASA in 1958, we continued NACA’s mission, propelling American innovation in aviation. Today, our portfolio of aeronautics missions and new flight technologies is as robust as ever. Below are seven of our innovations flying out of the lab and into the air, getting you gate-to-gate safely and on time while transforming aviation into an economic engine!

1. X-59 QueSST

Our X-59 Quiet SuperSonic Technology (QueSST) flies faster than the speed of sound without the window-shattering sonic boom. This innovation may kick off a new generation of quiet, supersonic planes that can fly over land without disturbing those below. Once adopted, QueSST’s technologies could drastically reduce the time it takes to fly across the U.S. and even to other countries worldwide!

2. X-57 Maxwell 

Our X-57 Maxwell will be the first all-electric X-plane, demonstrating the benefits distributed electric propulsion may have for future aviation. The Maxwell is named for Scottish physicist James Clerk Maxwell, who is known for his theories on electricity and electromagnetism. The name is also a play on words because, as X-57 engineer Nick Borer said, “It has the maximum number of propellers.”

3. Airborne Science

Our airborne science program provides Earth scientists and astrophysicists with the unique insights that can be gleaned from the air and above the clouds. By flying aircraft with Earth science instruments and advanced telescopes, we can gather high resolution data about our changing Earth and the stars above. Airborne science outreach specialist (and champion aerobatics pilot) Susan Bell highlights Fire Influence on Regional to Global Environments Experiment – Air Quality (FIREX-AQ), a joint mission with the National Oceanic and Atmospheric Administration (NOAA).

“FIREX-AQ will investigate the impact of wildfires and agricultural fires on air quality,” Susan said. “Living in the Western U.S., I witness firsthand the impact that smoke can have on the communities we live in and up in the air as a pilot.”

4. Search and Rescue

Our Search and Rescue (SAR) office serves as the technology development arm of the international satellite-aided search and rescue program, Cospas-Sarsat. Recently, the Federal Aviation Administration adopted SAR’s guidance regarding the testing and installation of the NASA-developed beacons required for planes. These recommendations will greatly improve aviation beacon performance and, ultimately, save more lives.

SAR developed the recommendations through crash test research at our Langley Research Center’s gantry in Hampton, Virginia, where Neil Armstrong and Buzz Aldrin trained for the Apollo Moon landing!

5. MADCAT

Our Mission Adaptive Digital Composite Aerostructure Technologies (MADCAT) team at our Ames Research Center in California’s Silicon Valley uses strong, lightweight carbon fiber composites to design airplane wings that can adapt on the fly. The composite materials are used to create “blocks,” modular units that can be arranged in repeating lattice patterns — the same crisscrossing patterns you might see in a garden fence!

6. RVLT

Our Revolutionary Vertical Lift Technology (RVLT) project leverages the agency’s aeronautics expertise to advance vertical flight capabilities in the U.S. The RVLT project helps design and test innovative new vehicle designs, like aircraft that can take off like a helicopter but fly like a plane. Additionally, the project uses computer models of the complex airflow surrounding whirring rotors to design vehicles that make less noise!

7. Moon to Mars

We’re with you when you fly — even on Mars! The 1958 law that established the agency charged us with solving the problems of flight within the atmosphere… but it didn’t say WHICH atmosphere. We’re applying our aeronautics expertise to the thin atmosphere of Mars, developing technologies that will enable flight on the Red Planet. In fact, a small, robotic helicopter will accompany the Mars 2020 rover, becoming the first heavier-than-air vehicle to fly on — err, above — Mars!

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History Made: Apollo 11 Splashes Down Today in 1969

The Apollo 11 Command Module “Columbia” is hoisted onto its recovery ship the USS Hornet, following splashdown on July 24, 1969. Credit: NASA

Four days after their historic achievement, Apollo 11 astronauts Neil Armstrong, Buzz Aldrin and Michael Collins splashed down in the Pacific Ocean at 12:49 p.m. EDT, about 900 miles from Hawaii. The crew was recovered by the crew of the USS Hornet where President Richard Nixon was waiting to greet them. 

Watch a replay of the original live broadcast of the recovery on NASA TV starting at 12:45 p.m. EDT. 

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5 Ways the Moon Landing Changed Life on Earth

When Neil Armstrong took his first steps on the Moon 50 years ago, he famously said “that’s one small step for a man, one giant leap for mankind.” He was referring to the historic milestone of exploring beyond our own planet — but there’s also another way to think about that giant leap: the massive effort to develop technologies to safely reach, walk on the Moon and return home led to countless innovations that have improved life on Earth.

Armstrong took one small step on the lunar surface, but the Moon landing led to a giant leap forward in innovations for humanity.

Here are five examples of technology developed for the Apollo program that we’re still using today:

1. Food Safety Standards

As soon as we started planning to send astronauts into space, we faced the problem of what to feed them — and how to ensure the food was safe to eat. Can you imagine getting food poisoning on a spacecraft, hundreds of thousands of miles from home?

We teamed up with a familiar name in food production: the Pillsbury Company. The company soon realized that existing quality control methods were lacking. There was no way to be certain, without extensive testing that destroyed the sample, that the food was free of bacteria and toxins.

Pillsbury revamped its entire food-safety process, creating what became the Hazard Analysis and Critical Control Point system. Its aim was to prevent food safety problems from occurring, rather than catch them after the fact. They managed this by analyzing and controlling every link in the chain, from the raw materials to the processing equipment to the people handling the food.

Today, this is one of the space program’s most far-reaching spinoffs. Beyond keeping the astronaut food supply safe, the Hazard Analysis and Critical Point system has also been adopted around the world — and likely reduced the risk of bacteria and toxins in your local grocery store. 

2. Digital Controls for Air and Spacecraft

The Apollo spacecraft was revolutionary for many reasons. Did you know it was the first vehicle to be controlled by a digital computer? Instead of pushrods and cables that pilots manually adjusted to manipulate the spacecraft, Apollo’s computer sent signals to actuators at the flick of a switch.

Besides being physically lighter and less cumbersome, the switch to a digital control system enabled storing large quantities of data and programming maneuvers with complex software.

Before Apollo, there were no digital computers to control airplanes either. Working together with the Navy and Draper Laboratory, we adapted the Apollo digital flight computer to work on airplanes. Today, whatever airline you might be flying, the pilot is controlling it digitally, based on the technology first developed for the flight to the Moon.

3. Earthquake-ready Shock Absorbers

A shock absorber descended from Apollo-era dampers and computers saves lives by stabilizing buildings during earthquakes.

Apollo’s Saturn V rockets had to stay connected to the fueling tubes on the launchpad up to the very last second. That presented a challenge: how to safely move those tubes out of the way once liftoff began. Given how fast they were moving, how could we ensure they wouldn’t bounce back and smash into the vehicle?

We contracted with Taylor Devices, Inc. to develop dampers to cushion the shock, forcing the company to push conventional shock isolation technology to the limit.

Shortly after, we went back to the company for a hydraulics-based high-speed computer. For that challenge, the company came up with fluidic dampers—filled with compressible fluid—that worked even better. We later applied the same technology on the Space Shuttle’s launchpad.

The company has since adapted these fluidic dampers for buildings and bridges to help them survive earthquakes. Today, they are successfully protecting structures in some of the most quake-prone areas of the world, including Tokyo, San Francisco and Taiwan.

4. Insulation for Space

We’ve all seen runners draped in silvery “space blankets” at the end of marathons, but did you know the material, called radiant barrier insulation, was actually created for space?

Temperatures outside of Earth’s atmosphere can fluctuate widely, from hundreds of degrees below to hundreds above zero. To better protect our astronauts, during the Apollo program we invented a new kind of effective, lightweight insulation.

We developed a method of coating mylar with a thin layer of vaporized metal particles. The resulting material had the look and weight of thin cellophane packaging, but was extremely reflective—and pound-for-pound, better than anything else available.

Today the material is still used to protect astronauts, as well as sensitive electronics, in nearly all of our missions. But it has also found countless uses on the ground, from space blankets for athletes to energy-saving insulation for buildings. It also protects essential components of MRI machines used in medicine and much, much more.

Image courtesy of the U.S. Marines

5. Healthcare Monitors

Patients in hospitals are hooked up to sensors that send important health data to the nurse’s station and beyond — which means when an alarm goes off, the right people come running to help.

This technology saves lives every day. But before it reached the ICU, it was invented for something even more extraordinary: sending health data from space down to Earth.

When the Apollo astronauts flew to the Moon, they were hooked up to a system of sensors that sent real-time information on their blood pressure, body temperature, heart rate and more to a team on the ground.

The system was developed for us by Spacelabs Healthcare, which quickly adapted it for hospital monitoring. The company now has telemetric monitoring equipment in nearly every hospital around the world, and it is expanding further, so at-risk patients and their doctors can keep track of their health even outside the hospital.

Only a few people have ever walked on the Moon, but the benefits of the Apollo program for the rest of us continue to ripple widely.

In the years since, we have continued to create innovations that have saved lives, helped the environment, and advanced all kinds of technology.

Now we’re going forward to the Moon with the Artemis program and on to Mars — and building ever more cutting-edge technologies to get us there. As with the many spinoffs from the Apollo era, these innovations will transform our lives for generations to come.

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#TBT to 1969: The Restoration of The Apollo Mission Control Center

On July 20, 1969 the Apollo Mission Control Center landed men on the Moon with only seconds of fuel left. 

Just after the spacecraft safely touched down on the lunar surface, Charlie Duke said to the crew, “Roger, Tranquility. We copy you on the ground. You got a bunch of guys about to turn blue—we’re breathing again. Thanks a lot.” The hard work and preparation of the men who stayed back on Earth was what made John F. Kennedy’s dreams of space exploration come true. 

Today, the facility these men worked in has been restored to its Apollo-era appearance, forever preserving this National Historic Landmark.

It took the restoration crew roughly six years to return the Apollo Mission Control Room to its original retro appearance. Every inch of the room was cleaned and restored by workers, enhancing the 1960s pistachio palette seen on the consoles, as well as ridding the room of 50-year-old gum stuck in places people thought would never be found. Let that be a lesson to us all.

From the artifacts sitting on the consoles to the displays projected at the front of the room, every detail has been carefully put in its proper place. Peep the American flag hanging in the back of the room—this flag went to the Moon on Apollo 17, was planted in the ground, then returned home as a souvenir. Next to the flag, a duplicate of the plaque placed on the Moon hangs on the wall.

Perhaps the only aspect of the room that wasn’t preserved was the thick stench of smoke, burnt coffee, banana peels and pizza boxes. But the ashtrays, pipes, cigarettes and coffee mugs sit in the room as reminders of the aroma. And yes, the Styrofoam cup is authentic to the ‘60s—it’s not an original artifact, but we’re certain this one will last for years to come.

In case you’re worried we didn’t get detailed enough, check the binders in the room. Each one is filled with authentic documents that would’ve been used during the Apollo missions. Some of the documents have been recreated, but many of them were copied from originals that employees had saved for 50 years.

Each console was rigged to send tubes throughout the building, often filled with important documents, but also stuffed with sandwiches and cake (all of the essentials to send men to the Moon).

Several of the surviving Apollo alumni visited mission control for the grand opening of the room at the end of June. Except for the smoke, they say the room looks just as they remember it did 50 years ago. It’s one giant leap—back in time.

This week, you can watch us salute our #Apollo50th heroes and look forward to our next giant leap for future missions to the Moon and Mars. Tune in: https://go.nasa.gov/Apollo50thEvents

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50 years ago, three Apollo astronauts rode this 363 foot tall rocket, the Saturn V, embarking on one of the greatest missions of mankind – to step foot on another world. On July 20, 1969, astronauts Buzz Aldrin, Michael Collins and Neil Armstrong made history when they arrived at the Moon. Thanks to the Saturn V rocket, we were able to complete this epic feat, returning to the lunar surface a total of six times. The six missions that landed on the Moon returned a wealth of scientific data and almost 400 kilograms of lunar samples. 

In honor of this historic launch, the National Air and Space Museum is projecting the identical rocket that took our astronauts to the Moon on the Washington Monument in Washington, D.C.

This week, you can watch us salute our Apollo 50th heroes and look forward to our next giant leap for future missions to the Moon and Mars. Tune in to a special two-hour live NASA Television broadcast at 1 p.m. ET on Friday, July 19. Watch the program at www.nasa.gov/live.

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We Like Big Rockets and We Cannot Lie: Saturn V vs. SLS

On this day 50 years ago, human beings embarked on a journey to set foot on another world for the very first time. 

At 9:32 a.m. EDT, millions watched as Apollo astronauts Neil Armstrong, Buzz Aldrin and Michael Collins lifted off from Launch Pad 39A at the Kennedy Space Center in Cape Canaveral, Florida, flying high on the most powerful rocket ever built: the mighty Saturn V.

As we prepare to return humans to the lunar surface with our Artemis program, we’re planning to make history again with a similarly unprecedented rocket, the Space Launch System (SLS). The SLS will be our first exploration-class vehicle since the Saturn V took American astronauts to the Moon a decade ago. With its superior lift capability, the SLS will expand our reach into the solar system, allowing astronauts aboard our Orion spacecraft to explore multiple, deep-space destinations including near-Earth asteroids, the Moon and ultimately Mars.

So, how does the Saturn V measure up half a century later? Let’s take a look.

Mission Profiles: From Apollo to Artemis 

Saturn V

Every human who has ever stepped foot on the Moon made it there on a Saturn V rocket. The Saturn rockets were the driving force behind our Apollo program that was designed to land humans on the Moon and return them safely back to Earth.

Developed at our Marshall Space Flight Center in the 1960s, the Saturn V rocket (V for the Roman numeral “5”)  launched for the first time uncrewed during the Apollo 4 mission on November 9, 1967. One year later, it lifted off for its first crewed mission during Apollo 8. On this mission, astronauts orbited the Moon but did not land. Then, on July 16, 1969, the Apollo 11 mission was the first Saturn V flight to land astronauts on the Moon. In total, this powerful rocket completed 13 successful missions, landing humans on the lunar surface six times before lifting off for the last time in 1973.

Space Launch System (SLS) 

Just as the Saturn V was the rocket of the Apollo generation, the Space Launch System will be the driving force behind a new era of spaceflight: the Artemis generation.

During our Artemis missions, SLS will take humanity farther than ever before. It is the vehicle that will return our astronauts to the Moon by 2024, transporting the first woman and the next man to a destination never before explored – the lunar South Pole. Over time, the rocket will evolve into increasingly more powerful configurations to provide the foundation for human exploration beyond Earth’s orbit to deep space destinations, including Mars.

SLS will take flight for the first time during Artemis 1 where it will travel 280,000 miles from Earth – farther into deep space than any spacecraft built for humans has ever ventured.

Size: From Big to BIGGER 

Saturn V

The Saturn V was big. 

In fact, the Vehicle Assembly Building at Kennedy Space Center is one of the largest buildings in the world by volume and was built specifically for assembling the massive rocket. At a height of 363 feet, the Saturn V rocket was about the size of a 36-story building and 60 feet taller than the Statue of Liberty!

Space Launch System (SLS)

Measured at just 41 feet shy of the Saturn V, the initial SLS rocket will stand at a height of 322 feet. Because this rocket will evolve into heavier lift capacities to facilitate crew and cargo missions beyond Earth’s orbit, its size will evolve as well. When the SLS reaches its maximum lift capability, it will stand at a height of 384 feet, making it the tallest rocket in the world.

Power: Turning Up the Heat 

Saturn V

For the 1960s, the Saturn V rocket was a beast – to say the least.

Fully fueled for liftoff, the Saturn V weighed 6.2 million pounds and generated 7.6 million pounds of thrust at launch. That is more power than 85 Hoover Dams! This thrust came from five F-1 engines that made up the rocket’s first stage. With this lift capability, the Saturn V had the ability to send 130 tons (about 10 school buses) into low-Earth orbit and about 50 tons (about 4 school buses) to the Moon.

Space Launch System (SLS)

Photo of SLS rocket booster test

Unlike the Saturn V, our SLS rocket will evolve over time into increasingly more powerful versions of itself to accommodate missions to the Moon and then beyond to Mars.

The first SLS vehicle, called Block 1, will weigh 5.75 million pounds and produce 8.8 million pounds of thrust at time of launch. That’s 15 percent more than the Saturn V produced during liftoff! It will also send more than 26 tons  beyond the Moon. Powered by a pair of five-segment boosters and four RS-25 engines, the rocket will reach the period of greatest atmospheric force within 90 seconds!

Following Block 1, the SLS will evolve five more times to reach its final stage, Block 2 Cargo. At this stage, the rocket will provide 11.9 million pounds of thrust and will be the workhorse vehicle for sending cargo to the Moon, Mars and other deep space destinations. SLS Block 2 will be designed to lift more than 45 tons to deep space. With its unprecedented power and capabilities, SLS is the only rocket that can send our Orion spacecraft, astronauts and large cargo to the Moon on a single mission.

Build: How the Rockets Stack Up

Saturn V

The Saturn V was designed as a multi-stage system rocket, with three core stages. When one system ran out of fuel, it separated from the spacecraft and the next stage took over. The first stage, which was the most powerful, lifted the rocket off of Earth’s surface to an altitude of 68 kilometers (42 miles). This took only 2 minutes and 47 seconds! The first stage separated, allowing the second stage to fire and carry the rest of the stack almost into orbit. The third stage placed the Apollo spacecraft and service module into Earth orbit and pushed it toward the Moon. After the first two stages separated, they fell into the ocean for recovery. The third stage either stayed in space or crashed into the Moon.

Space Launch System (SLS)

Much like the Saturn V, our Space Launch System is also a multi-stage rocket. Its three stages (the solid rocket boosters, core stage and upper stage) will each take turns thrusting the spacecraft on its trajectory and separating after each individual stage has exhausted its fuel. In later, more powerful versions of the SLS, the third stage will carry both the Orion crew module and a deep space habitat module.

A New Era of Space Exploration 

Just as the Saturn V and Apollo era signified a new age of exploration and technological advancements, the Space Launch System and Artemis missions will bring the United States into a new age of space travel and scientific discovery.

Join us in celebrating the 50th anniversary of the Apollo 11 Moon landing and hear about our future plans to go forward to the Moon and on to Mars by tuning in to a special two-hour live NASA Television broadcast at 1 p.m. ET on Friday, July 19. Watch the program at www.nasa.gov/live.

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Remember the Women Who Made #Apollo50th Possible

As the world celebrates the 50th anniversary of the historic Moon landing, we remember some of the women whose hard work and ingenuity made it possible. The women featured here represent just a small fraction of the enormous contributions made by women during the Apollo era. 

Margaret Hamilton, Computer Programmer

Margaret Hamilton led the team that developed the building blocks of software engineering — a term that she coined herself. Her systems approach to the Apollo software development and insistence on rigorous testing was critical to the success of Apollo. In fact, the Apollo guidance software was so robust that no software bugs were found on any crewed Apollo missions, and it was adapted for use in Skylab, the Space Shuttle and the first digital fly-by-wire systems in aircraft.

In this photo, Hamilton stands next to a stack of Apollo Guidance Computer source code. As she noted, “There was no second chance. We all knew that.”

Katherine Johnson, Aerospace Technologist

As a very young girl, Katherine Johnson loved to count things. She counted everything, from the number of steps she took to get to the road to the number of forks and plates she washed when doing the dishes.

As an adult, Johnson became a “human computer” for the National Advisory Committee for Aeronautics, which in 1958, became NASA. Her calculations were crucial to syncing Apollo’s Lunar Lander with the Moon-orbiting Command and Service Module. “I went to work every day for 33 years happy. Never did I get up and say I don't want to go to work."

Judy Sullivan, Biomedical Engineer

This fabulous flip belongs to biomedical engineer Judy Sullivan, who monitored the vital signs of the Apollo 11 astronauts throughout their spaceflight training via small sensors attached to their bodies. On July 16, 1969, she was the only woman in the suit lab as the team helped Neil Armstrong suit up for launch.

Sullivan appeared on the game show “To Tell the Truth,” in which a celebrity panel had to guess which of the female contestants was a biomedical engineer. Her choice to wear a short, ruffled skirt stumped everyone and won her a $500 prize. In this photo, Sullivan monitors a console during a training exercise for the first lunar landing mission.

Billie Robertson, Mathematician

Billie Robertson, pictured here in 1972 running a real-time go-no-go simulation for the Apollo 17 mission, originally intended to become a math teacher. Instead, she worked with the Army Ballistic Missile Agency, which later became rolled into NASA. She created the manual for running computer models that were used to simulate launches for the Apollo, Skylab and Apollo Soyuz Test Project programs. 

Robertson regularly visited local schools over the course of her career, empowering young women to pursue careers in STEM and aerospace.

Mary Jackson, Aeronautical Engineer

In 1958, Mary Jackson became NASA’s first African-American female engineer. Her engineering specialty was the extremely complex field of boundary layer effects on aerospace vehicles at supersonic speeds.

In the 1970s, Jackson helped the students at Hampton’s King Street Community center build their own wind tunnel and use it to conduct experiments. “We have to do something like this to get them interested in science," she said for the local newspaper. "Sometimes they are not aware of the number of black scientists, and don't even know of the career opportunities until it is too late."

Ethel Heinecke Bauer, Aerospace Engineer

After watching the launch of Sputnik in October 1957, Ethel Heinecke Bauer changed her major to mathematics. Over her 32 years at NASA, she worked at two different centers in mathematics, aerospace engineering, development and more. 

Bauer planned the lunar trajectories for the Apollo program including the ‘free return’ trajectory which allowed for a safe return in the event of a systems failure  — a trajectory used on Apollo 13, as well as the first three Apollo flights to the Moon. In the above photo, Bauer works on trajectories with the help of an orbital model.

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We Worked on Apollo

On July 20, 1969, the world watched as Apollo 11 astronauts Neil Armstrong and Buzz Aldrin took their first steps on the Moon. It was a historic moment for the United States and for humanity. Until then, no human had ever walked on another world. To achieve this remarkable feat, we recruited the best and brightest scientists, engineers and mathematicians across the country. At the peak of our Apollo program, an estimated 400,000 Americans of diverse race and ethnicity worked to realize President John F. Kennedy’s vision of landing humans on the Moon and bringing them safely back to Earth. The men and women of our Ames Research Center in California’s Silicon Valley supported the Apollo program in numerous ways – from devising the shape of the Apollo space capsule to performing tests on its thermal protection system and study of the Moon rocks and soils collected by the astronauts. In celebration of the upcoming 50th anniversary of the Apollo 11 Moon landing, here are portraits of some of the people who worked at Ames in the 1960s to help make the Apollo program a success.

“I knew Neil Armstrong. I had a young daughter and she took her first step on the day that Neil stepped foot on the Moon. Isn’t that something?”

Hank Cole did research on the design of the Saturn V rocket, which propelled humans to the Moon. An engineer, his work at Ames often took him to Edwards Air Force Base in Southern California, where he met Neil Armstrong and other pilots who tested experimental aircraft.

“I worked in a lab analyzing Apollo 11 lunar dust samples for microbes. We wore protective clothing from head to toe, taking extreme care not to contaminate the samples.”

Caye Johnson came to Ames in 1964. A biologist, she analyzed samples taken by Apollo astronauts from the Moon for signs of life. Although no life was found in these samples, the methodology paved the way for later work in astrobiology and the search for life on Mars.

“I investigated a system that could be used to provide guidance and control of the Saturn V rocket in the event of a failure during launch. It was very exciting and challenging work.”

Richard Kurkowski started work at Ames in 1955, when the center was still part of the National Advisory Committee on Aeronautics, NASA’s predecessor. An engineer, he performed wind tunnel tests on aircraft prior to his work on the Apollo program.

“I was 24 and doing some of the first computer programming work on the Apollo heat shield.  When we landed on the Moon it was just surreal. I was very proud. I was in awe.”

Mike Green started at Ames in 1965 as a computer programmer. He supported aerospace engineers working on the development of the thermal protection system for the Apollo command module. The programs were executed on some of earliest large-scale computers available at that time.

“In 1963 there was alarm that the Apollo heat shield would not be able to protect the astronauts. We checked and found it would work as designed. Sure enough, the astronauts made it home safely!”

Gerhard Hahne played an important role in certifying that the Apollo spacecraft heat shield used to bring our astronauts home from the Moon would not fail. The Apollo command module was the first crewed spacecraft designed to enter the atmosphere of Earth at lunar-return velocity – approximately 24,000 mph, or more than 30 times faster than the speed of sound.

“I was struck by the beauty of the photo of Earth rising above the stark desert of the lunar surface. It made me realize how frail our planet is in the vastness of space.”

Jim Arnold arrived at Ames in 1962 and was hired to work on studying the aerothermodynamics of the Apollo spacecraft. He was amazed by the image captured by Apollo 8 astronaut Bill Anders from lunar orbit on Christmas Eve in 1968 of Earth rising from beneath the Moon’s horizon. The stunning picture would later become known as the iconic Earthrise photo.

“When the spacecraft returned to Earth safely and intact everyone was overjoyed. But I knew it wasn’t going to fail.”

Howard Goldstein came to Ames in 1967. An engineer, he tested materials used for the Apollo capsule heat shield, which protected the three-man crew against the blistering heat of reentry into Earth’s atmosphere on the return trip from the Moon. 

“I was in Houston waiting to study the first lunar samples. It was very exciting to be there when the astronauts walked from the mobile quarantine facility into the building.”

Richard Johnson developed a simple instrument to analyze the total organic carbon content of the soil samples collected by Apollo astronauts from the Moon’s surface. He and his wife Caye Johnson, who is also a scientist, were at our Lunar Receiving Laboratory in Houston when the Apollo 11 astronauts returned to Earth so they could examine the samples immediately upon their arrival.

“I tested extreme atmospheric entries for the Apollo heat shield. Teamwork and dedication produced success.”

William Borucki joined Ames in 1962. He collected data on the radiation environment of the Apollo heat shield in a facility used to simulate the reentry of the Apollo spacecraft into Earth’s atmosphere.  

Join us in celebrating the 50th anniversary of the Apollo 11 Moon landing and hear about our future plans to go forward to the Moon and on to Mars by tuning in to a special two-hour live NASA Television broadcast at 1 pm ET on July 19. Watch the program at www.nasa.gov/live.

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Throwback Thursday: Apollo 11 FAQ Edition

With the help of the NASA History Office, we’ve identified some of the most frequently asked questions surrounding the first time humans walked on the surface of another world. Read on and click here to check out our previous Apollo FAQs. 

How many moon rocks did the Apollo crews bring back? What did we learn?

The six crews that landed on the Moon brought back 842 pounds (382 kilograms) of rocks, sand and dust from the lunar surface. Each time, they were transferred to Johnson Space Center’s Lunar Receiving Laboratory, a building that also housed the astronauts during their three weeks of quarantine. Today the building now houses other science divisions, but the lunar samples are preserved in the Lunar Sample Receiving Laboratory.

Built in 1979, the laboratory is the chief repository of the Apollo samples.

From these pieces of the Moon we learned that its chemical makeup is similar to that of Earth’s, with some differences. Studying the samples has yielded clues to the origins of the solar system. In March of 2019, we announced that three cases of pristine Moon samples will be unsealed for the first time in 50 years so that we can take advantage of the improved technology that exists today! 

Did you know you might not have to travel far to see a piece of the Moon up close? Visit our Find a Moon Rock page to find out where you can visit a piece of the Moon.

What did Apollo astronauts eat on their way to the Moon?

Astronaut food has come a long way since the days of Project Mercury, our first human spaceflight program that ran from 1958-1963. Back then, astronauts “enjoyed” food in cube form or squeezed out of tubes. Early astronaut food menus were designed less for flavor and more for nutritional value, but that eventually shifted as technology evolved. Astronauts today can enjoy whole foods like apples, pizza and even tacos. 

Apollo crews were the first to have hot water, making it easier to rehydrate their foods and improve its taste. They were also the first to use a “spoon bowl,” a plastic container that was somewhat like eating out of a Ziploc bag with a spoon. Here’s an example of a day’s menu for a voyage to the Moon:

Breakfast: bacon squares, strawberry cubes and an orange drink.

Lunch: beef and potatoes, applesauce and a brownie.

Dinner: salmon salad, chicken and rice, sugar cookie cubes and a pineapple grapefruit drink.

What did Michael Collins do while he orbited the Moon, alone in the Command Module?

As Neil Armstrong and Buzz Aldrin worked on the lunar surface, Command Module pilot Michael Collins orbited the Moon, alone, for the next 21.5 hours. On board he ran systems checks, made surface observations and communicated with Mission Control when there wasn’t a communications blackout. Blackouts happened every time Collins went behind the Moon. In 2009, Collins wrote this in response to a flurry of media questions about the 40th anniversary of the mission:

Q. Circling the lonely Moon by yourself, the loneliest person in the universe, weren't you lonely? A. No. Far from feeling lonely or abandoned, I feel very much a part of what is taking place on the lunar surface. I know that I would be a liar or a fool if I said that I have the best of the three Apollo 11 seats, but I can say with truth and equanimity that I am perfectly satisfied with the one I have. This venture has been structured for three men, and I consider my third to be as necessary as either of the other two.”

What will Artemis astronauts bring back when they land on the Moon?

Artemis missions to the Moon will mark humanity’s first permanent presence on another world. The first woman and the next man to explore the lunar surface will land where nobody has ever attempted to land before -- on the Moon’s south pole where there are billions of tons of water ice that can be used for oxygen and fuel. We don’t know yet what astronauts will bring back from this unexplored territory, but we do know that they will return with hope and inspiration for the next generation of explorers: the Artemis generation. Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

Throwback Thursday: Answers to Apollo Moon Landing Questions

The first six missions to the Moon helped us answer questions about our nearest celestial neighbor, but a curious public wanted to know more about how we did it. With the help of the NASA History Office, we’ve identified some of the most frequently asked questions surrounding the first time humans walked on the surface of another world. Read on and click here to check out our post from last week and the week before. 

Why do some shadows on the Moon appear to go in different directions?

For Apollo astronauts, the Sun wasn’t the sole source of light. The high reflectivity of the lunar surface or “albedo” means that the Moon's many craters, hills and rocks bounce sunlight to wash out the stars multiple shadows on objects. The highly uneven terrain means that shadows can have slightly different lengths, as well. For example, two astronauts standing several feet away from each other can have different shadow lengths because one may be on a slope.

While the Lunar Module itself was also reflective, Apollo astronauts had yet another bright source of light: Earth! To a moonwalker, a half-full Earth would be about 20 times brighter than a full Moon as seen from our home planet. This also explains why stars are not visible in pictures. Think about it: if you wanted to photograph all the stars that can be seen from Earth, would you want to do it during a full Moon? 

Why are there no blast craters under the Lunar Modules? 

The Moon has endured billions of years of bombardment from micrometeorites and large meteorites, compacting the dust into extremely dense rock. A thin layer of fine and powdery moondust covers the ground, but the dense rock beneath this layer makes it hard to penetrate the surface. That, paired with an engine thrusting in a vacuum means that the exhaust would expand rapidly outward instead of straight down like it would on Earth. The large engine nozzle. Still, many pictures clearly show dust markings radiating from the landing site. 

Can Humans Really Survive Passing Through the Van Allen Radiation Belts?

The short answer is yes, but with protection. The Van Allen radiation belts, named after their discoverer James van Allen, are regions high above Earth’s surface that trap highly charged particles that radiate off the Sun. This energetic region contains harmful radiation that would be lethal to anybody who encountered them unprotected. Thankfully, the 12 astronauts that passed through the belts did so relatively quickly in the comfort of their shielded spacecraft that had been tested to withstand high doses of radiation. Although all six crews had to pass through the Van Allen belts, the dosimeters indicated that they received a dosage no higher than that of a chest X-ray or a single CAT scan. 

Why are we going back to the Moon?

Exploring the Moon is only the first part in our mission to expand humanity’s presence on Mars and beyond. The Moon is the ideal stepping stone for testing technology that will enable us to expand humanity’s presence on Mars and beyond. Click here to learn more about the Artemis program that will take humans to the lunar surface within five years -- this time, to stay. Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

They Put a Flag on the Moon

It’s 1969 and Apollo 11 astronauts Buzz Aldrin and Neil Armstrong are the first humans to land on the Moon. In now iconic footage, Aldrin and Armstrong carefully assemble and maneuver an American flag to place on the lunar surface. The fabric unfurls, staying suspended without any wind to animate the stars and stripes. The flagpole sways precariously as the crew work to anchor it in the Moon’s low gravity at just 1/6th that of Earth’s. How did this moment come about? On Flag Day, let’s dive behind-the-scenes of what led to getting the American flag on the Moon 50 years ago.

Image: Astronaut Buzz Aldrin poses for a photograph beside the deployed United States flag during the Apollo 11 mission.

Seeking to empower the nation, President John F. Kennedy gave us a grand charge. The human spaceflight program of the early 1960s was challenged to work on missions that sent humans to the surface of another world. Following President Kennedy’s death in 1963, President Richard Nixon stressed a more international perspective to the Apollo missions. To reconcile the need for global diplomacy with national interests, we appointed the Committee on Symbolic Activities for the First Lunar Landing.

Image: NASA Administrator Thomas Paine and President Richard Nixon are seen aboard the USS Hornet, Apollo 11’s splashdown recovery vessel.

The committee, and the U.S. at large, wanted to avoid violating the United Nations Outer Space Treaty, which prohibited any nation from taking possession of a celestial body. After some debate, they recommended that the flag only appear during the Apollo 11 spacewalk. A plaque would accompany it, explaining that the flag was meant to stand for peaceful exploration, not conquest. 

Image: The plaque reads “Here men from the planet Earth first set foot upon the Moon July 1969 A.D. We came in peace for all of mankind.” Under the text are signatures by President Nixon, Buzz Aldrin, Neil Armstrong, and Michael Collins.

A team of engineers at Johnson Space Center had three months to resolve several issues regarding the flag’s assembly. First, was the Moon’s lack of atmosphere. The flag, quite literally, could not fly the way it does on Earth. To address this, a horizontal crossbar was added to support the flag’s weight and give the illusion of it waving.

Image: NASA technician David L. McCraw shows the flag next to a Lunar Module mockup.

Second was the flag’s assembly, which had to be as lightweight and compact as possible so as not to take up limited storage space. The completed package, which was attached to Lunar Module’s ladder, weighed just under ten pounds. It received an outer case made of steel, aluminum, and Thermoflex insulation and blanketing to shield the flag from the 2,000 degree Fahrenheit spike from the Eagle’s descent engine.

Image: Component pieces of the flag assembly.

The last issue was mobility. Bulky spacesuits significantly restricted the astronauts’ range of motion, and suit pressurization limited how much force they could apply. To accommodate these limits, the team included telescoping components to minimize the need to reach and maneuver the poles. A red painted ring on the flagpole indicated how far into the ground it should be driven. Hinges and catches would lock into place once the pieces were fully extended.

Image: Diagram from the 1969 Apollo 11 press release illustrating astronaut spacesuit reach capabilities and ideal working height.

Fifty years after Apollo 11, the flag we planted on the lunar surface has likely faded but its presence looms large in United States history as a symbol of American progress and innovation.

Image: A close-up view of the U.S. flag deployed on the Moon at the Taurus-by the crew of Apollo 17, the most recent lunar landing mission.

The story doesn’t stop here. Anne Platoff's article “Where No Flag Has Gone Before” sheds more light on the context and technical process of putting the United States flag on the Moon. You can also check out Johnson Space Center’s recent feature story that details its presence in later missions. Happy Flag Day!  Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

Throwback Thursday: Apollo 11 Moon Landing Questions Answered

The Apollo 11 Moon landing was a feat for the ages. With the help of the NASA History Office, we’ve identified some of the most frequently asked questions surrounding the first time humans walked on the surface of another world. Click here to check out our post from last week. 

Is it true that the Apollo guidance computer had less computing power than a smartphone?

Believe it or not, yes! The Apollo guidance computer not only had less computing power than a smartphone, it had less computing power than the calculator you use in your algebra class. The computer, designed by MIT, had a fixed memory of 36 kilobytes and an erasable memory of 2 kilobytes. That’s fairly advanced for the time! 

Why did Buzz Aldrin take a picture of his bootprint?

A substantial portion of the Apollo 11 crew’s checklist was taking photographs. Taking closeup shots of the "very fine” moon dust was a critical component of mission objectives and helped scientists better understand the surface makeup of the Moon. 

Armstrong and Aldrin wore lunar overboots over their main spacesuit boots to protect them from ultraviolet radiation and hazardous rocks. To make room for the nearly 50 pounds (22 kilograms) of lunar samples, the crew left all their pairs of boots on the Moon. But don’t worry; they wouldn’t get charged an overweight baggage fee anyway. 

What were the first words spoken from the surface of the Moon?

That’s somewhat subject to interpretation. Once the Lunar Module’s surface sensor touched the surface, Buzz Aldrin called out "Contact Light” to Mission Control. After the engine shut down, he said “ACA out of detent,” simply meaning that the Eagle’s Attitude Control Assembly, or control stick, was moved from its center position. 

But the first words heard by the entire world after Apollo 11 touched down were delivered by Neil Armstrong: "Houston, Tranquility Base here. The Eagle has landed.” More than six hours later, Armstrong stepped off the Eagle’s footpad and delivered the most famous words ever spoken from the surface of another world: "That's one small step for [a] man, one giant leap for mankind."  And although we have a hard time hearing it in the recording, Armstrong clarified in a post-flight interview that he actually said, “That’s one small step for a man...”

What will the first woman and the next man to go to the Moon say when they first step on its surface?

We can’t say for sure what our next moonwalkers will decide to say, but perhaps the better question is: What would be your first words if you were to land on the Moon? There’s no doubt that the astronauts of the Artemis Generation will inspire a new crop of explorers the way Apollo Generation astronauts did 50 years ago.  Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

Throwback Thursday: Frequently Asked Questions about Apollo

In celebration of the 50th anniversary of Apollo 11, we’ll be sharing answers to some frequently asked questions about the first time humans voyaged to the Moon. Answers have been compiled from archivists in the NASA History Office.

How many people worked on the Apollo program?

At the height of Apollo in 1965, about 409,900 people worked on some aspect of the program, but that number doesn’t capture it all.

It doesn’t represent the people who worked on mission concepts or spacecraft design, such as the engineers who did the wind tunnel testing of the Apollo Command Module and then moved on to other projects. The number also doesn’t represent the NASA astronauts, mission controllers, remote communications personnel, etc. who would have transferred to the Apollo program only after the end of Gemini program (1966-1967). There were still others who worked on the program only part-time or served on temporary committees. In the image above are three technicians studying an Apollo 14 Moon rock in the Lunar Receiving Laboratory at Johnson Space Center. From left to right, they are Linda Tyler, Nancy Trent and Sandra Richards.

How many people have walked on the Moon so far?

This artwork portrait done by spaceflight historian Ed Hengeveld depicts the 12 people who have walked on the Moon so far. In all, 24 people have flown to the Moon and three of them, John Young, Jim Lovell and Gene Cernan, have made the journey twice.  

But these numbers will increase.

Are the U.S. flags that were planted on the Moon still standing?

Every successful Apollo lunar landing mission left a flag on the Moon but we don’t know yet whether all are still standing. Some flags were set up very close to the Lunar Module and were in the blast radius of its ascent engine, so it’s possible that some of them could have been knocked down. Neil Armstrong and Buzz Aldrin both reported that the flag had been knocked down following their ascent. 

Our Lunar Reconnaissance Orbiter took photographs of all the Apollo lunar landing sites. In the case of the Apollo 17 site, you can see the shadow of the upright flag.

But why does it look like it’s waving?

The flags appear to “wave” or “flap” but actually they’re swinging. Swinging motions on Earth are dampened due to gravity and air resistance, but on the Moon any swinging motion can continue for much longer. Once the flags settled (and were clear of the ascent stage exhaust), they remained still.  And how is the flag hanging? Before launching, workers on the ground had attached a horizontal rod to the top of each flag for support, allowing it to be visible in pictures and television broadcasts to the American public. Armstrong and Aldrin did not fully extend the rod once they were on the Moon, giving the flag a ripple effect. The other astronauts liked the ripple effect so much that they also did not completely extend the rod. 

Why don’t we see stars in any of the pictures?

Have you ever taken a photo of the night sky with your phone or camera? You likely won’t see any stars because your camera’s settings are likely set to short exposure time which only lets it quickly take in the light off the bright objects closest to you. It’s the same reason you generally don’t see stars in spacewalk pictures from the International Space Station. There’s no use for longer exposure times to get an image like this one of Bruce McCandless in 1984 as seen from Space Shuttle Challenger (STS-41B).

The Hasselblad cameras that Apollo astronauts flew with were almost always set to short exposure times. And why didn’t the astronauts photograph the stars? Well, they were busy exploring the Moon!

When are we going back to the Moon?

The first giant leap was only the beginning. Work is under way to send the first woman and the next man to the Moon in five years. As we prepare to launch the next era of exploration, the new Artemis program is the first step in humanity’s presence on the Moon and beyond.

Keep checking back for more answers to Apollo FAQs.

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If #NationalCheeseDay has you thinking about the Moon, you're not alone. 🧀

In 1965, the Ranger 9 probe captured these sharp images of a cratered lunar surface just moments before its planned impact. What we learned paved the way for Apollo. #Apollo50th

Ariana Grande got some space at N-A-S-A. Get yours too.

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Build a Rover, Race a Rover!

Have you ever wanted to drive a rover across the surface of the Moon?

This weekend, students from around the world will get their chance to live out the experience on Earth! At the Human Exploration Rover Challenge, managed by NASA's Marshall Space Flight Center in Huntsville, Alabama, high schoolers and college students operate human-powered rovers that they designed and built as they traverse a simulated world, making decisions and facing obstacles that replicate what the next generation of explorers will face in space.

Though the teams that build the rover can be a few people or a few dozen, in the end, two students (one male, one female) will end up navigating their rover through a custom-built course at the U.S. Space and Rocket Center. Each duo will push their rover to the limit, climbing up hills, bumping over rocky and gravelly grounds, and completing mission objectives (like retrieving soil samples and planting their team flag) for extra points -- all in less than seven minutes.

2019 will mark the 25th year of Rover Challenge, which started life as the Great Moonbuggy Race on July 16, 1994. Six teams braved the rain and terrain (without a time limit) in the Rocket City that first year -- and in the end, the University of New Hampshire emerged victorious, powering through the moon craters, boulder fields and other obstacles in eighteen minutes and fifty-five seconds.

When it came time to present that year's design awards, though, the honors went to the University of Puerto Rico at Humacao, who have since become the only school to compete in every Great Moonbuggy Race and Rover Challenge hosted by NASA Marshall. The second-place finishers in 1994, the hometown University of Alabama in Huntsville, are the only other school to compete in both the first race and the 25th anniversary race in 2019.

Since that first expedition, the competition has only grown: the race was officially renamed the Human Exploration Rover Challenge for 2014, requiring teams to build even more of their rover from the wheels up, and last year, new challenges and tasks were added to better reflect the experience of completing a NASA mission on another planet. This year, almost 100 teams will be competing in Rover Challenge, hailing from 24 states, Washington, D.C., Puerto Rico, and countries from Bolivia to Bangladesh.

Rover Challenge honors the legacy of the NASA Lunar Roving Vehicle, which made its first excursion on the moon in 1971, driven by astronauts David Scott and James Irwin on Apollo 15. Given the competition's space race inspiration, it's only appropriate that the 25th year of Rover Challenge is happening in 2019, the 50th anniversary of Neil Armstrong and Buzz Aldrin's historic Apollo 11 moon landing.

Interested in learning more about Rover Challenge? Get the details on the NASA Rover Challenge site -- then join us at the U.S. Space and Rocket Center (entrance is free) or watch live on the Rover Challenge Facebook Page starting at 7 AM CT, this Friday, April 12 and Saturday, April 13. Happy roving!

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Happy #MoonDay! To celebrate the 49th anniversary of Apollo 11 landing on the Moon, we present you with “Moonlight,” a video by our Goddard science visualizer Ernie Wright set to Debussy’s Clair de Lune. The Apollo missions were a landmark in lunar exploration. The visit and the samples that our Moon walkers collected transformed our understanding of the Moon and the solar system. Now, our Lunar Reconnaissance Orbiter’s high-resolution data gives an incredibly detailed view of our closest neighbor.

This visualization captures the mood of Claude Debussy's best-known composition, Clair de Lune (which means moonlight in French). The piece was published in 1905 as the third of four movements in the composer's Suite Bergamasque, and unlike the other parts of this work, Clair is quiet, contemplative, and slightly melancholy, evoking the feeling of a solitary walk through a moonlit garden.

“Moonlight” uses a digital 3D model of the Moon built from Lunar Reconnaissance Orbiter global elevation maps and image mosaics. The lighting is derived from actual Sun angles during lunar days in 2018. Enjoy and read more HERE.

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