Interacting Mice

Today's Astronomy Picture of the Day shows NGC 4676 in the constellation of Coma Berenices, or Bernice's Hair. The galaxies pictured have collided and are being deformed as a result, giving them "tails" and the nickname of the "Mice".  The "Mice" are part of Halton Arp's Atlas of Peculiar Galaxies (which is something worth looking at in terms of background).