how elliptical galaxies are formed?
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The universe is a violent place, and collisions between galaxies are frequent — indeed, the Milky Way is due to crash into the Andromeda Galaxy in a few billion years. When two spirals collide, they lose their familiar shape, morphing into the less-structured elliptical galaxies.
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This structure can be viewed as consisting of six separate parts: (1) a nucleus, (2) a central bulge, (3) a disk (both a thin and a thick disk), (4) spiral arms, (5) a spherical component, and (6) a massive halo. Some of these components blend into each other. Three views of the Milky Way Galaxy.
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An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure.
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How do cumulonimbus clouds form? Cumulonimbus clouds are born through convection, often growing from small cumulus clouds over a hot surface. They get taller and taller until they represent huge powerhouses, storing the same amount of energy as 10 Hiroshima-sized atom bombs.
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The most fundamental difference between the galaxy types is that spiral galaxies have a rotating disk of gas in which ongoing star formation can occur, while elliptical galaxies do not. Therefore, once gas is stripped out of a galaxy, it can no longer have a gaseous disk.
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Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole. Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.
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Stellar mass black holes form from the collapse of massive stars at the end of their lives. You can then find them scattered throughout galaxies, just like you find massive stars. They typically have a mass a few times the mass of the sun. Supermassive black holes are found at the centers of galaxies.
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Stars form immense groups called galaxies. A galaxy can contain many millions of stars, held together by the force of gravity. Our Sun is in a spiral galaxy called the Milky Way. The Sun is about half-way from the centre of the galaxy, on one of the arms.
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Types of Galaxies Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. These galaxies span a wide range of sizes, from dwarf galaxies containing as few as 100 million stars to giant galaxies with more than a trillion stars.
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It is not difficult to observe; it is impossible. Even under the best conditions, and with the best equipment, you will never see the shape of the Milky Way. This is because the Milky Way in general, and the spiral arms in particular, contain a lot of dust and gas which absorbs photons.
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constellation Patterns formed by prominent stars that lie close to each other in the night sky. ... galaxy A massive group of stars bound together by gravity. gravity The force that attracts anything with mass, or bulk, toward any other thing with mass. Milky Way The galaxy in which Earth's solar system resides.
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How do arcus clouds form? When a cold downdraft from a cumulonimbus cloud reaches the ground, the cold air may spread rapidly along the ground, pushing existing warm moist air upwards. As this air rises, water vapour condenses into the patterns associated with Arcus clouds.
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A constellation is the imaginary pattern formed by a few stars. There are 81 known constellations. A galaxy is group of millions or even billions of stars, and it's planets and satellites and all of the stuff. Galaxies can be of these shapes- Spiral, barred spiral, elliptical and irregular.
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Around 13.8 billion years ago, the universe was born in a colossal explosion known as the Big Bang. This produced two things: matter and energy. The universe formed in a tiny fraction of a second. ... The universe grew and cooled, and eventually stars and galaxies were formed.
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And because black holes form from the deaths of supermassive stars (i.e., normal, baryonic matter), the initial composition of a newly-formed black hole is always approximately 100% normal matter and 0% dark matter.
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Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.
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Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.