Sagittarius dwarf galaxy is now in the process of being swallowed by the Milky Way Galaxy after a complete disruption caused by Galactic tides. Part of our stellar Halo has been formed from additions of such smaller constituents.The Sagittarius dwarf galaxy is our nearest neighbor. Despite its proximity, it lay undiscovered until 1994, being hidden by foreground Galactic stars and dust of the Milky Way. The Sagittarius dwarf galaxy is located at 75,000 light-years from the Sun and 50,000 light-years from our Galactic Center. This makes Sagittarius dwarf galaxy the nearest known satellite of the Milky Way.
http://www.cosmiverse.com/space03070202.html
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