Astronomy Picture of the Day . ... The shockwave from a 20,000 year-old supernova in the constellation of Cygnus supernova explosion is still expanding into interstellar space. ... The picture is a combination of three images taken in January 1998 and shows the lovely ringed planet in reflected infrared light. ... Cosmic Collisions in a Galaxy Cluster . ... Hundreds of galaxies appear as faint smudges of light in this Hubble Space Telescope picture of galaxy cluster MS1054-03. ... First page ] Prev. ...