Here is Messier 101, the Pinwheel Galaxy
, a spectacular spiral galaxy about 25 million light years away in the constellation Ursa Major. Its spiral structure was first seen in the 19th century by Lord Rosse in his telescope known as the Leviathan of Parsonstown. This image is composed of data from space telescopes at different wavelengths and color coded: Chandra X-ray Observatory (purple), the Galaxy Evolution Explorer (blue), Hubble Space Telescope(yellow), and the Spitzer Space Telescope(red). The X-ray data trace the location of multimillion degree gas around M101's exploded stars and neutron star and black hole binary star systems, the lower energy data follow the stars and dust that define M101's grand spiral arms.
Image Credit: NASA, ESA, CXC, JPL, Caltech STScI
Text: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)