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Whirlpool galaxy M51 (NGC 5194). Ultraviolet (blue), X-ray (purple), infrared (red) and visible light (green) composite image of the spiral galaxy M51. This classic spiral galaxy is one of the brightest galaxies in the sky. The smaller galaxy seen at upper left is NGC 5195. These galaxies lie about 23 million light years from Earth, in the constellation Canes Venatici. Image obtained using the Galaxy Evolution Explorer (GALEX) Orbiter telescope, the Chandra X-ray Observatory, the Spitzer Space Telescope and the Hubble Space Telescope. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/JPL-CALTECH/CXC/STSCI/SCIENCE PHOTO LIBRARY)