Knots in the gas ring around supernova 1987A brighten in images made with the Hubble Space Telescope in February 1998, January 1999 and February 2000.

Credit: P. Challis and R. Kirshner (Harvard-Smithsonian Center for Astrophysics), P. Garnavich (University of Notre Dame) and Z. Levay (STScI)

Publication: February 16, 2000