Three of these galaxies (top right, bottom left, and bottom right) are normal and show no signs of past collisions, while the top left galaxy's irregular shape suggests it collided with a neighbor, in... more 
Three of these galaxies (top right, bottom left, and bottom right) are normal and show no signs of past collisions, while the top left galaxy's irregular shape suggests it collided with a neighbor, in these photos from the Hubble Space Telescope. less 
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SPACE.com | Photo By NASA, ESA, and K. Schawinski (Yale University)
Wed, Jun 20, 2012 6:12 PM EDT