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The interaction between this pair of galaxies has distorted them both: the lower galaxy has a bizarre structure and a tidal tail emerges from the main body of the upper galaxy. They are about 550 million light-years away from the Sun.

CREDIT: NASA, ESA, the Hubble Heritage Team (STScI/AURA) - ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University).

Source:
http://hubblesite.org/newscenter/archive/releases/2008/16/image/bj/