Left: Galaxies 12 million light-years away in the constellation Ursa Major. Right: The Hubble Space Telescope shows bright blue star clusters along a wispy bridge of gas stretched between the two galaxies, and a third companion galaxy not seen in this picture. The so-called "blue blobs" are clumped together in a structure called Arp's Loop. Credit: NASA, ESA, and D. de Mello (Catholic University of America/GSFC)
