September 18, 2009
This mosaic of M31 merges 330 individual images taken by the Ultraviolet/Optical Telescope aboard NASA's Swift spacecraft. It is the highest-resolution image of the galaxy ever recorded in the ultraviolet. The image shows a region 200,000 light-years wide and 100,000 light-years high (100 arcminutes by 50 arcminutes).
Topics: Technology Internet, Galaxy, Optical telescope, Telescopes, National Aeronautics and Space Administration, Explorer program, Andromeda Galaxy, Andromeda constellation, Hubble Space Telescope