what defines a galaxy
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- A galaxy is an enormous collection of gas, dust and billions of stars held together by gravity. One galaxy can have hundreds of billions of stars and be as large as 200,000 light years across.
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University of California, San Diego Center for Astrophysics & Space Sciences The Milky Way system is a spiral galaxy consisting of over 400 billion stars, plus gas and dust arranged into three general components as shown to the left: The halo-a roughly spherical distribution which contains the oldest stars in the Galaxy, The nuclear bulge and Galactic Center.
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Galaxy The word galaxy is derived from the Greek galaxias (γαλαξίας), literally milky, a reference to the Milky Way. Galaxies range in size from dwarfs with just a few hundred million (108) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass.
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Why Is Our Galaxy Called The Milky Way? The Milky Way is part of a collection of galaxies called the Local Group. We’re on a collision course with the most massive and largest member of that collection, which is the Andromeda Galaxy (also known as M31). The Milky Way is the second-largest galaxy, and the Triangulum Galaxy (M33) the third-largest.
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- Alvaro Uribe was born in Medellin, Colombia, in 1952. He was the 39th President of Colombia. Alvaro Uribe obtained a law degree from the University of Antioquia, and also attended Harvard and Oxford universities.iography: Juan Manuel Santos was born in Bogota, Colombia, in 1951. Juan Manuel Santos is the current President of Colombia.
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- The galaxy we live in, called the Milky Way Galaxy, is a barred spiral galaxy composed of at least 100 billion stars. It is approximately 100,000 light years across and about 1000 light years thick.
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ASTRONOMY FOR KIDS Quasars are extremely distant objects in our known universe. They are the furthest objects away from our galaxy that can be seen. Quasars are extremely bright masses of energy and light. The name quasar is actually short for quasi-stellar radio source or quasi-stellar object. Quasars are the brightest objects in our universe, although to see one through a telescope they do not look that bright at all. This is because quasars are so far away. They emit radio waves, x-rays and light waves.
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GALAXY a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile. Unlike flat spiral galaxies with organization and structure, they are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.
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General Astronomy/Print version Structure and Composition. The galaxy we live in, called the Milky Way Galaxy, is a barred spiral galaxy composed of at least 100 billion stars. It is approximately 100,000 light years across and about 1000 light years thick. It has a central bulge that is about 10,000 light years in diameter.
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- galaxy meaning, definition, what is galaxy: one of the independent groups of stars in the universe. Learn more.
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- A galaxy is a massive group of stars, star clusters, interstellar gas and dust, and dark matter which is all gravitationally bound together. The word 'galaxy' is derived from the Greek word galaxias which means milky, it is a reference to our own galaxy the Milky Way.
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astronomy A large assemblage of stars, nebulae, and interstellar gas and dust. In a spiral galaxy, a localized region in which matter piles up as it orbits the center of the galaxy; this is a proposed explanation of spiral structure. spin. spiral arms. Lanes of interstellar gas, dust, and young stars that wind outward in a plane from the central regions of a galaxy.
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E galaxy elliptical galaxy. (ĭ-lĭp'tĭ-kəl) The most common type of galaxy, ranging in shape from nearly spherical (classified as E0) to greatly elongated (classified as E7). Elliptical galaxies vary greatly in size and include some of the largest and smallest known galaxies.
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Galaxy A Star Cluster is a cluster of stars found within a galaxy or the intergalactic medium, and they don't usually have supermassive black hole centers or spiral arms. Star cluste…rs contain around a thousand stars, compared to the Milky Way's 300 billion stars.
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Equinox A galaxy was a massive, gravitationally bound assemblage of stars, an interstellar medium of gas and dust, and an unknown type of dark matter.
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Solar System, Galaxy, Universe: What's the Difference? On that scale with our Solar System in your hand, the Milky Way Galaxy, with its 200 – 400 billion stars, would span North America (see the illustration on the right). 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! NASA’s telescopes allow us to study galaxies beyond our own in exquisite detail, and to explore the most distant reaches of the observable universe.
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Galaxies Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and about six times as much dark matter as all the stars and gas put together. And it’s all held together by gravity. Like more than two-thirds of the known galaxies, the Milky Way has a spiral shape.
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Instancing The Galaxy Server. The Galaxy Server tracks the location, assets, relationships, etc. of players in the Star Citizen persistent universe. It coordinates the placement of players into instances when they are in close enough proximity to interact. –Chris Roberts.
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Andromeda Galaxy The Andromeda Galaxy is the largest galaxy of the Local Group, followed by the Milky Way and the Triangulum Galaxy, there are around 30 other smaller galaxies in the group. Galaxies often collide with each other. Usually, the stars within each will move past one and other due to the vast space between them.
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itchy ankles!!!???? Every once in awhile my ankles get very itchy and I scratch them until I get the little red bumps too. I have Crohn's but I also have vericose veins. I alway thought that the itching was related to the veins and not the Crohn's but maybe I am wrong.
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Astronomy The study of objects outside our galaxy is a branch of astronomy concerned with the formation and evolution of Galaxies; their morphology (description) and classification; and the observation of active galaxies, and at a larger scale, the groups and clusters of galaxies.
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- constellation noun [C] uk / ˌkɒn.stəˈleɪ.ʃ ə n / us / ˌkɑːn.stəˈleɪ.ʃ ə n / › any of the groups of stars in the sky that seem from earth to form a pattern and have been given names
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- Astronomy a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. (usually cap.) See Milky Way. any large and brilliant or impressive assemblage of persons or things:a galaxy of opera stars.
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Definitions &Translations A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Other stars are visible from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth.
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- Thank you for your question. Our Milky Way galaxy is a pretty typical large galaxy. Most of the stars are in a disk that is about 100,000 light years across in diameter and 3000 light years thick. Most of the galaxies in the universe are actually smaller than the Milky Way.
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constellation The definition of a constellation is a group of stars that create a pattern in the sky. Facts About Constellations. The International Astronomical Union (IAU) met for the first time in 1922. They picked the 88 constellations which we use today.