Image of Arp 87, a system of two galaxies: NGC 3808A (right) and NGC 3808B (left). The galaxies are embracing due to their individual gravitational pulls.
NASA/HST
<a rel="nofollow" class="external free" href="http://hubblesite.org/newscenter/archive/releases/2007/36/">http://hubblesite.org/newscenter/archive/releases/2007/36/</a>