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This pair of galaxies, named Arp 87, is one of hundreds of interacting galaxies known in the nearby universe. The two players are NGC 3808 (right) and NGC 3808A (left). The bridge of matter between them suggests that some stars and gas drawn from the larger galaxy have been caught in the gravitational pull of the smaller one. The shapes of both galaxies have been distorted by their gravitational interaction.

CREDIT: NASA, ESA, and The Hubble Heritage Team (STScI/AURA).

Source:
http://hubblesite.org/newscenter/archive/releases/2007/36/image/a/