Galaxy Wallpaper

Incredible Galaxy Photo Gallery - Wallpaper Unique Illustrations - Planets Art Images Free Download !

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion stars to giants with one hundred trillion stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral and irregular.

Amazing Galaxy and Stars Pictures HD Wallpapers - Digital Art High Definition !

Fun Facts : Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun.

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