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galaxy wallpapers

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Super Mario Galaxy 2
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Lunar Space Galaxy
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iOS 7 Galaxy
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Spiral Galaxy
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Sombrero Galaxy
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Planet Galaxy
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Cosmic Exploration Chart
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Andromeda Galaxy
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GALAXY Geforce GTX980 Hall of Fame
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STAR WARS R2D2 & C3PO
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Mario Galaxy Game
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Samsung Galaxy S3
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C 5 Galaxy at Balad Air Base Iraq
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M45 The Pleiades Star Cluster
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A Sagittarius Triplet
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Galaxy NGC 7714 After Collision
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Galaxy Power
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Colorful Stars in Galaxy
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Guardians of the Galaxy 2014 Movie
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Sci Fi Galaxy
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Modern C 5 Galaxy
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Nature Sunshine Galaxy S4
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Planets
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2014 Guardians of the Galaxy
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A galaxy is a gravitationally bound system consisting of stars, stellar remnants, interstellar gas and dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way. Examples of galaxies range from dwarfs with just a few thousand (103) stars to giants with one hundred trillion (1014) stars, each orbiting their galaxy's own center of mass. Galaxies have historically been categorized according to their visual morphology, including elliptical, spiral, irregular, and starburst. Many galaxies are believed to have black holes at their active center. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times that of our Sun. The observable universe contains hundreds of billions (more than 1011) of galaxies. Most are 1,000 to 100,000 parsecs in diameter and usually separated by distances on the order of millions of parsecs (or megaparsecs). The space between galaxies is filled with...

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