what is the primary difference between an active galaxy and a normal one?
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Most, if not all, normal galaxies have a supermassive black hole at their center. In an active galaxy, its supermassive black hole is accreting material from the galaxy's dense central region.
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Active Galaxies are typically more luminous than normal galaxies. Typical luminosities range from 1011LSun to 1015LSun. The active galaxies often have a nucleus which is much brighter than the nucleus of a normal galaxy. The active galaxies often have gigantic jets pointing out of the galaxy.
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The main difference is just display size, which we mentioned above. Both the Galaxy Watch and Galaxy Watch Active look good, but the latter is the more comfortable watch to wear. It also doesn't look tiny on large wrists, and doesn't look massive on small ones.
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All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area. ... Our Solar System is about 25,000 light years away from the center of our galaxy – we live in the suburbs of our galaxy.
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The Milky Way does not sit still, but is constantly rotating. As such, the arms are moving through space. The sun and the solar system travel with them. The solar system travels at an average speed of 515,000 mph (828,000 km/h).
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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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The word universe basically means everything that is, including galaxies and whatever lies between the galaxies. A galaxy is a large collection (millions or billions) of stars held together by gravity. We live in a galaxy called the Milky Way galaxy.
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An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies.
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Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them!
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Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark matter as all the stars and gas put together. And it's all held together by gravity.
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The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
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While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born.
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Size and mass The Milky Way is the second-largest galaxy in the Local Group (after the Andromeda Galaxy), with its stellar disk approximately 170-200 000 light years in diameter and, on average, approximately 1,000 ly (0.3 kpc) thick. The Milky Way is approximately 890 billion times the mass of the Sun.
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The fundamental difference between a protostar and a star is that the latter has nuclear fusion as its energy source and the former does not. The birth of stars is a battle between gravity and radiation pressure. ... A typical protostar may be several thousand times more luminous than the Sun.
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A galaxy is a system of solar systems and other stars. ... The galaxy that contains the Earth and its solar system is called the Milky Way. This galaxy is thought to contain more than 200 billion different stars. Solar systems orbit around their galaxies just as planets orbit around their suns.
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The main difference between stars and planets is that stars have high temperatures compared to planets. ... Because they radiate energy, stars are very bright objects. Planets do not generate their own energy through nuclear reactions. They reflect some of the radiation coming from their parent star.
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We live in one of the arms of a large spiral galaxy called the Milky Way. The Sun and its planets (including Earth) lie in this quiet part of the galaxy, about half way out from the centre.