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Astrophysics - Blog Posts
-My left brain 🧠
i'm so glad I was born in a time where we know about so many things in space and yet have so many mysteries left to unravel. I seriously don't know what kind of person I'd be without my love for black holes
As someone with a physics education, I can one hundred percent agree that this is the true beauty about the universe. There is so much wonderful in the world that we barely understand and may never know. And you know what? That's okay!
Sir Isaac Newton Hareket Yasaları
1666 yılında daha 23 yaşındayken Galileo ve Kepler’in çalışmalarında da faydalanarak “Hareket Yasaları” ve “Kütle Çekim Yasalarını” geliştirdi. Kalkülüs ve Cebir’in kurucuları arasındadır. 1687 yılında klasik fiziğin temeli olan hareket yasalarını 3 ciltlik “Principia” isimli kitabında anlatmıştır.
Newton, Galileo, Descartes hareketle ilgili fikirlerde bulunmuştur. 1600’lü yıllardan önce cisim hep durma eğilimi gösterir mantığı varken bu üç adam her şeyi değiştirdi. Cisimlerin aslında durmaya karşı bir direnç gösterdiğini savundu. Ve klasik fizik Newton’un ellerinde doğdu.
1.Yasa Eylemsizlik:
Eylemsizlikten ilk olarak Galileo bahsetmiştir. Newton kitabında eylemsizlik için “her cisim eğer üzerine etkiyen bir kuvvet tarafından durumu bozulmaya zorlanmazsa düzgün doğrusal hareketini ya da durma halini korumaya direnir” açıklamasını yapmıştır.
Sabit bir kuvvet uygulanan cismin kütlesi arttıkça, eyleme karşı direnci artar. Burada Newton 2.yasayla bir bağlantı kurmuştur. Zaten bu yüzden Descartes ve Galileo’dan hareket yasalarında çok daha önemli bir yerde görülür.
2.Yasa:
F=mxa formülünden de anlayacağımız gibi; cisim kütlesiyle ters , uygulanan kuvvetle doğru orantılı olarak ivmelenir. İvme gibi kavramları açıklamak için şuan da diferansiyel işlemler kullanırız. Aslında Newton’da bunların doğruluğunu kanıtlamak için Kalkülüs ve Cebir’i geliştirerek kullanmıştır.
3.Yasa Etki-Tepki:
Eğer bir cisme bir kuvvet uygulanırsa aynı şekilde cisimde bir tepki kuvveti doğurur. Kuvvetlerin çift olduğunu kabul ederiz bu yasayla birlikte.
Newton Hareket Yasalarını doğru kabul edebilmemiz için referansımız 1.Yasa olarak almamız lazım bu referans sistemine “eylemsiz referans” deriz. Newton’a göre mutlak uzay ve mutlak zaman göreli değildir. Bunun sebebi Newton’da bir sınırımız vardır. Einstein İzafiyet Teorisinde zaman ve uzayın tek bütün kabul edildiği ve göreceli olduğunu ortaya koymuştur. Sınırları bildiğimiz sürece Newton mantıklıdır.
Hi! I’m Mel, and this blog a project of mine I’ve been thinking about for a while. This is basically a digital archive for all my science thoughts- anything that I feel deserves more attention, published research, or just things I find really cool! Keep in mind that I’m a minor (17 years old) and I’ll be using the block button liberally if I feel uncomfortable 🪐💫
divider by @ianrkives
A few curiosities of astronomy and astrophysics
Astronomy and Astrophysics: Facts
Here is a list of some curiosities of astronomy and astrophysics. From our solar system to interstellar space.
Rings of Saturn: With an estimated local thickness of as little as 10 m and as much as 1 km, they are composed of 99.9% pure water ice with a smattering of impurities that may include tholins or silicates. The main rings are primarily composed of particles ranging in size from 1 cm to 10 m.
Valhalla (crater): Valhalla is the largest multi-ring impact crater on Jupiter’s moon Callisto and in the Solar System. It is named after Valhalla, the God Odin’s hall in Norse mythology where warriors are taken after death.
Europa (lineae): Europa’s most striking surface features are a series of dark streaks crisscrossing the entire globe, called lineae (English: lines). Close examination shows that the edges of Europa’s crust on either side of the cracks have moved relative to each other. The larger bands are more than 20 km (12 mi) across, often with dark, diffuse outer edges, regular striations, and a central band of lighter material. The most likely hypothesis states that the lineae on Europa may have been produced by a series of eruptions of warm ice as the Europan crust spread open to expose warmer layers beneath. The effect would have been similar to that seen in Earth’s oceanic ridges.
Tartarus Dorsa: The western part of Pluto’s northern hemisphere consists of an extensive, highly distinctive set of 500-meter-high mountains informally named Tartarus Dorsa; the spacing and shape of the mountains looks similar to scales or tree bark.
Mountain in Ceres: Ahuna Mons is the largest mountain on the dwarf planet and asteroid Ceres. It protrudes above otherwise smooth terrain, it is not an impact feature, and it appears to be the only mountain of its kind on Ceres. Bright streaks run top to bottom on its slopes; these streaks are thought to be salt, similar to the better known Cererian bright spots, and likely resulted from cryovolcanic activity from Ceres’s interior. It is named after the traditional post-harvest festival Ahuna of the Sumi Naga people of India.
Pluto has a tenuous atmosphere consisting of nitrogen (N2), methane (CH4), and carbon monoxide (CO), which are in equilibrium with their ices on Pluto’s surface. According to the measurements by New Horizons, the surface pressure is about 1 Pa(10 μbar), roughly one million to 100,000 times less than Earth’s atmospheric pressure. It was initially thought that, as Pluto moves away from the Sun, its atmosphere should gradually freeze onto the surface; studies of New Horizons data and ground-based occultations show that Pluto’s atmospheric density increases, and that it likely remains gaseous throughout Pluto’s orbit.
Sagittarius A*: Sagittarius A* is a bright and very compact astronomical radio source at the center of the Milky Way, near the border of the constellations Sagittarius and Scorpius. It is part of a larger astronomical feature known as Sagittarius A. Sagittarius A* is thought to be the location of a supermassive black hole, like those that are now generally accepted to be at the centers of most spiral and elliptical galaxies.
Double Pulsar: PSR J0737−3039 is the only known double pulsar. It consists of two neutron stars emitting electromagnetic waves in the radio wavelength in a relativistic binary system. The two pulsars are known as PSR J0737−3039A and PSR J0737−3039B. It was discovered in 2003 at Australia’s Parkes Observatory by an international team led by the radio astronomer Marta Burgay during a high-latitude pulsar survey.
IC 1101: IC 1101 is a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster, approximately 320 megaparsecs (1.04 billion light-years) from Earth. IC 1101 is among the largest known galaxies, but there is debate in the astronomical literature about how to define the size of such a galaxy.
A rogue planet (also termed an interstellar planet, nomad planet, free-floating planet, orphan planet, wandering planet, starless planet, sunless planet, or Planemo) is a planetary-mass object that orbits the galaxy center directly. Such objects have been ejected from the planetary system in which they formed or have never been gravitationally bound to any star or brown dwarf. The Milky Way alone may have billions of rogue planets.
souce: wikipedia
Image credit: NASA/JPL/SwRI, Ted Stryk, John Rowe Animations, commons.wikimedia
History student falls in love with astrophysics student by Keaton St. James
(patreon)
[poem text: listen, nine hundred and fifty years before jesus was a child shaking willow leaves out of his tangled curls, the author of the song of solomon wrote: behold, you are beautiful; your eyes are doves.
what i’m trying to say is that, in this universe which sculpted itself from a baptism of fire, i am the moon swept up by your tenderness. you’ve got me dreaming foreign words: gravity, ellipsis, perigee, until all i can think about is becoming anchored into orbit around the saltwater-green landscape of your laughter.
listen, plato of ancient greece wrote that the souls we each have now are only halves. that in a frenzy of blood zeus severed us from each other, so we rely on the blind tugging of our hearts. you say my name and i want to knit my bones into your bones, smooth away the boundaries of our heartbeats.
what i’m trying to say is that if the temperature inside those wild pockets of interstellar dust hits right near absolute zero, carbon monoxide and dihydrogen molecules condense together in the dark nebula to form stars. if you’re ready, i want to make you shiver like that. /end poem text.]
Feeling stressed? Imagine being squeezed into a point smaller than an atom! 😱 That's what happens at the heart of a black hole. Swipe ➡️ through this post to learn how these cosmic wonders are formed! 🌌✨
Utopia on Mars Image Credit: NASA, The Viking Project, M. Dale-Bannister (Washington University)
Explanation: Expansive Utopia Planitia on Mars is strewn with rocks and boulders in this 1976 image. Constructed from the Viking 2 lander's color and black and white image data, the scene approximates the appearance of the high northern martian plain to the human eye - NASA
Egg NebulaPhoto by geckzilla via flickr(cc)
The "ice giants" Uranus and Neptune appear to glow red-orange in new photos taken using Hawaii's Keck Observatory. The pictures show Uranus' rings and several moons, as well as Neptune's largest moon, Triton.
credits : livescience.com
Moon over Andromeda
Composite Image Credit & Copyright: Adam Block and Tim Puckett
Have you guys watched the new Alien Worlds docuseries on Netflix?
Earthrise, Bill Anders, 1968.
True colour (left) and false colour views of Uranus from Voyager 2 taken on 17th of January, 1986 from a distance of 5.7 million miles.
Credits : NASA
Saturn Behind the Moon
Image Credit: Peter Patonai (Astroscape Photography)
While appearing as a delicate and light veil draped across the sky, this image from the NASA/ESA Hubble Space Telescope actually depicts a small section of the Cygnus supernova blast wave, located around 2,400 light-years away. The name of the supernova remnant comes from its position in the northern constellation of Cygnus (the Swan), where it covers an area 36 times larger than the full Moon.
Image Credit: NASA/ESA Hubble Space Telescope
Question of the day : How far is the Moon from planet Earth?
Mars as seen from Hubble, snapped on April 27th through May 6th, 1999.
Image Credit : NASA COMMONS
Earth and Moon from Saturn, a true color composite taken on July the 19th, 2013 from Cassini spacecraft at a distance of 898, 419, 474 miles or 1,445,865,990 kilometers away from Earth.
Credits : NASA/JPL/SSI/Composite by Val Klavans via Flickr
Happy eighth anniversary, rover Curiosity !
Picture Description: NASA's Curiosity rover took this selfie on Oct. 11, 2019, the 2,553rd Martian day, or sol, of its mission.
The rover drilled twice in this location, nicknamed "Glen Etive" (pronounced "glen EH-tiv"). About 984 feet (300 meters) behind the rover, Vera Rubin Ridge rises up. Behind it lies the floor of Gale Crater, which Curiosity is exploring, and the northern rim of the crater. (Text adapted from nasa.gov)
Credits: NASA
Saturn like Exo Planet discovered in the habitable zone of another star system by a bunch of relatively amateur astronomers — under the umbrella called Habitable Exoplanet Hunting Project. (HEHP)
Watch the video here : https://youtu.be/0A7gEaewOws
The Pillars of Creation at the centre of M16 or the Eagle Nebula
Credits: NASA, ESA and the Hubble Heritage Team (STScI/AURA)
GLOBAL VIEW OF VENUS IN ULTRAVIOLET FROM AKATSUKI
A false-color image using two ultraviolet channels from Akatsuki's UVI camera at 283 nm and 365 nm distinguishes different components of the Venusian atmosphere.
VENUS' NIGHTSIDE GLOW
This image shows the night side of Venus in thermal infrared. It is a false-colour image using data from Akatsuki.
VENUS' SOUTH POLE IN ULTRAVIOLET FROM AKATSUKI, JUNE 20, 2016
A false-color image using two ultraviolet channels from Akatsuki's UVI camera, showing details along a colourful band encircling Venus' south polar vortex in morning daylight.
Images Credit : JAXA / ISAS / DARTS / Damia Bouic
VENUS' COUPLED DYNAMICS AND SULFUR CHEMISTRY FROM AKATSUKI, JULY 23, 2016
A false-color image using two ultraviolet channels from Akatsuki's UVI camera. Venus' cloud dynamics are just as complex as Earth's.
Note : Akatsuki is a Japanese mission launched in 2010 to orbit Venus (which it failed the first time) but successfully entered Venus' orbit on December the 7th, 2015.
EQUATORIAL REGION OF VENUS FROM AKATSUKI
Images acquired during orbit number 13 of the Japanese probe Akatsuki show an incredible amount of detail on the equatorial, tropical, and extra-tropical clouds of the planet
VENUS IN INFRARED FROM AKATSUKI: CLOUD WAVE
This view of Venus was acquired by the Japanese Akatsuki spacecraft's IR2 camera, which observes—among other things—the "warmth" of the planet's atmosphere on its nocturnal side.
Variable star RS Puppis, about ten times more massive than our Sun and fifteen times more luminous.
Image Data : NASA/ESA/HUBBLE
Copyright & Mixing : Rogellio Bernal Andreo
I am speechless.