PASADENA, Calif., Dec. 7 (UPI) -- NASA says a small telescope on one of its spacecraft has made a big discovery, an example of a galaxy cluster, one of the rarest and largest galaxy groupings.
The Wide-field Infrared Survey Explorer has detected one of the massive structures -- a collection of thousands of galaxies bound together by gravity -- NASA's Jet Propulsion Laboratory in Pasadena, Calif., reported Thursday.