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1 minute ago
➡️The star was detected approximately 4,600 light-years from Earth.
➡️The mass of the pulsar was measured through a phenomenon known as "Shapiro Delay." In essence, gravity from a white dwarf companion star warps the space surrounding it, in accordance with Einstein's general theory of relativity. This makes the pulses from the pulsar travel just a little bit farther as they travel through the distorted spacetime around white dwarf. This delay tells them the mass of the white dwarf, which in turn provides a mass measurement of the neutron star.
➡️Neutron stars are the compressed remains of massive stars gone supernova. They're created when giant stars die in supernovas and their cores collapse, with the protons and electrons melting into each other to form neutrons. ➡️To visualize the mass of the neutron star discovered, a single sugar-cube worth of neutron-star material would weigh 100 million tons here on Earth, or about the same as the entire human population. ➡️While astronomers and physicists have studied these objects for decades, many mysteries remain about the nature of their interiors: Do crushed neutrons become "superfluid" and flow freely? Do they breakdown into a soup of subatomic quarks or other exotic particles? What is the tipping point when gravity wins out over matter and forms a black hole?
➡️Pulsars get their name because of the twin beams of radio waves they emit from their magnetic poles. These beams sweep across space in a lighthouse-like fashion. Some rotate hundreds of times each second.
Since pulsars spin with such phenomenal speed and regularity, astronomers can use them as the cosmic equivalent of atomic clocks. Such precise timekeeping helps astronomers study the nature of spacetime, measure the masses of stellar objects and improve their understanding of general relativity.
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7 minutes ago
Trees give good look; don't destroy them from earth book.
17 minutes ago
What’s something that makes you lose all track of time? For me it’s reading (obviously) and space 🌌🌟🚀
17 minutes ago
The science (explained by @cosmic.rationalist): Every soap bubble is made up of three individual layers; a thin layer of water molecules sandwiced between two layers of soap. What we observe in this video is the layer of water freezing, while the soap layers are still liquid. This is because water freezes at warmer temperatures than soapy water.
Unfortunately, the frozen bubbles don’t stay that way.
As ice crystals form in the bubble’s surface, they're accompanied by cracks. This means that the air trapped within the initial soap bubble can now escape, via. these cracks formed as a consequence of ice crystal formation. As the air leaves the bubble, the pressure within reduces, and the bubble is crushed by the atmospheric pressure.
Video Credit: @sherrill_photo
Music: @jeffkaale ”Mornings”
39 minutes ago
47 minutes ago
WHEN GIANTS STEPPED ON EARTH!🌍
The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption located in the Northern Ireland. The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. Most of the columns are hexagonal, although there are also some with four, five, seven or eight sides. The tallest are about 12 metres (39 ft) high, and the solidified lava in the cliffs is 28 metres (92 ft) thick in places.🍀
Around 50 to 60 million years ago, during the Paleocene Epoch, this area was subject to intense volvanic activity, when highly fluid molten basalt intruded through chalk beds to form an extensive lava plateau. As the lava cooled, contraction occured.🌋
Horizontal contraction fractured in a similar way to drying mud, with the cracks propagating down as the mass cooled, leaving pillarlike structures, which are also fractured horizontally into "biscuits". In many cases the horizontal fracture has resulted in a bottom face that is comvex while the upper face of the lower segment is concave, producing what are called "ball and socket" joints.🏛
The size of the columns is primarily determined by the speed at which lava from a volcanic eruption cools. The extensive fracture network produced the distinctive columns seen today. The basalts were originally part of a great volcanic plateau called the Thulean Plateau which formed during the Paleocene.🗻
1 hour ago
Posted @withrepost • @astronomy_eye The Porpoise galaxy, aka The penguin and the egg 👽
What's happening to this spiral galaxy? Just a few hundred million years ago, NGC 2936, the upper of the two large galaxies shown, was likely a normal spiral galaxy -- spinning, creating stars -- and minding its own business. But then it got too close to the massive elliptical galaxy NGC 2937 below and took a dive. Dubbed the Porpoise Galaxy for its iconic shape, NGC 2936 is not only being deflected but also being distorted by the close gravitational interaction. A burst of young blue stars forms the nose of the porpoise toward the right of the upper galaxy, while the center of the spiral appears as an eye. Alternatively, the galaxy pair, together known as Arp 142, look to some like a penguin protecting an egg. Either way, intricate dark dust lanes and bright blue star streams trail the troubled galaxy to the lower right. The featured re-processed image showing Arp 142 in unprecedented detail was taken by the Hubble Space Telescope last year. Arp 142 lies about 300 million light years away toward the constellation, coincidently, of the Water Snake (Hydra). In a billion years or so the two galaxies will likely merge into one larger galaxy.
Image Credit: NASA, ESA.
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1 hour ago
Scott Joseph Kelly Playing ping pong with water in space! 👨🚀 🔭
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1 hour ago
Super blood moon😰😰😰
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As we know that Moon orbits around the Earth and Earth orbits around the Sun. Moon takes around 27 days to orbit the Earth. The relative positions of the Sun, the Moon and the Earth change during the Moon's orbit.
During total lunar eclipse, Moon remains fully in Earth's shadow. And at the same time small amount of light from Earth's falls on the surface of the Moon during sunrise and sunset. Since, the light waves are stretched out, they look red and when this red light strikes the surface of the Moon, it also appears red. Or we can say that when Earth comes in between the Sun and the Moon, Moon will not receive direct sunlight from the Sun. .
The light which is seen is refracted through Earth’s atmosphere, giving it a red tinge. It depends upon the pollution, cloud cover in the atmosphere that how much red the Moon appears. And this colourful effect sometimes calls a lunar eclipse a Blood Moon. Do you know that roughly two or four lunar eclipses occur every year according to NASA and each one is visible over about half the Earth?
From this article we understood that a blue moon is the second full moon in a single calendar month, a supermoon is a moon that is full when it is at its closest point in its slightly elliptical orbit around the Earth and a total lunar eclipse or blood moon in which Earth's shadow upon the lunar eclipse gives it a reddish colour.
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1 hour ago
INIZIALMENTE URANO ERA STATO CHIAMATO GEORGE
Era il marzo del 1781 quando William Herschel intuì, a differenza dei suoi predecessori, che quel
puntino nel cielo non era una stella, ma bensì un pianeta. Dopo che ebbe comunicato la sua
scoperta alla Royal Society, astronomi da vari paesi nel mondo si misero a calcolare l’orbita del
presunto pianeta, arrivando unanimemente alla conclusione che l’ipotesi di Herschel era esatta.
Re Giorgio III (George III) d’Inghilterra premiò Herschel per la sua scoperta, nominandolo astronomo di corte; in onore del suo re, Herschel, chiamò il pianeta “Georgium Sidus”, che dal
latino si può tradurre come “astro di George”. A molti astronomi non piaceva il nome assegnato
al nuovo pianeta, perché richiamava troppo la monarchia inglese, tuttavia il suo nome rimase
invariato per quasi 70 anni, fino al 1850, quando fu cambiato definitivamente in Urano, dalla
HMNAO, seguendo il suggerimento dell’astronomo tedesco Johann Bode.
Crediti foto: NASA
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1 hour ago
Life Cycle of a Star
Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size. Very large, massive stars burn their fuel much faster than smaller stars and may only last a few hundred thousand years. Smaller stars, however, will last for several billion years, because they burn their fuel much more slowly.
Eventually, however, the hydrogen fuel that powers the nuclear reactions within stars will begin to run out, and they will enter the final phases of their lifetime. Over time, they will expand, cool and change colour to become red giants. The path they follow beyond that depends on the mass of the star.
Small stars, like the Sun, will undergo a relatively peaceful and beautiful death that sees them pass through a planetary nebula phase to become a white dwarf, this eventually cools down over time leaving a brown dwarf. Massive stars, on the other hand, will experience a most energetic and violent end, which will see their remains scattered about the cosmos in a enormous explosion, called a supernova. Once the dust clears, the only thing remaining will be a very dense star known as a neutron star, these can often be rapidly spinning and are known as pulsars. If the star which explodes is especially large, it can even form a black hole.
Image Source : Internet
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