PASADENA, California, Aug. 8 -- The California Institute of Technology issued the following news: Nearly 15 years ago, a relatively small spacecraft about the size of a polar bear launched into space with a big mission: to map the entire sky at infrared wavelengths with a sensitivity up to hundreds of thousands of times better than previous surveys. The NASA mission, called WISE (Wide-field Infrared Survey Explorer), far exceeded expectations, scanning the skies not once but twice and leaving b  more