Galaxy collisions happen all the time. The Milky Way has not had a major collision for over 10 billion years, but it is now swallowing a small galaxy, the Sagittarius dwarf. In a few billion years the Milky Way will begin colliding with our larger neighbor, the Andromeda galaxy. |
This pair of galaxies, known as ``The Mice'' because of their long tails, are in the middle of a collision. |
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