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The one constant in the Universe: StarDate magazine
What is the nearest galaxy? 
The nearest galaxy to our own is a recently discovered dwarf galaxy with the somewhat inglorious moniker "Sagittarius dwarf." It lies on the opposite side of the Milky Way from Earth, approximately 100,000 light-years distant. At such a proximity to our own, much larger galaxy, the Sagittarius dwarf is being ripped apart by tidal forces, and in the distant future it will no longer be recognized as a galaxy at all. When this happens, the title of "nearest galactic neighbor" will once again fall on the Large Magellanic Cloud, an irregular galaxy located a mere 160,000 light-years away.

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