In this image provided by NASA's Goddard Space Flight Center, this ultraviolet image of the Crab Nebula was obtained by NASA's Ultraviolet Imaging Telescope (UIT) during the Astro-1 mission of Space Shuttle Columbia on December 2-11, 1990. The Crab Nebula is the rapidly expanding remains of a supernova (or exploding star) whose detonation was witnessed by medieval astronomers in the Orient and the Middle East in July 1054. The UIT photograph, made in ultraviolet light which is blocked from view of telescopes on the ground by the Earth’s atmosphere, reveals the eerie glow produced by extremely energetic electrons rushing out from the center of the Nebula at nearly the speed of light. (AP Photo/NASA Goddard Space Flight Center)