NASA, ESA, G. BACON / SCIENCE PHOTO LIBRARY NASA, ESA, G. BACON / SCIENCE PHOTO LIBRARY
Supernova 1993J. Computer illustration of supernova 1993J, an exploding star in the galaxy M81. This supernova originated in a double-star system where one member was a massive star that exploded after siphoning most of its hydrogen envelope to its companion star. After two decades, astronomers have at last identified the blue helium-burning companion star at the centre of the expanding nebula of debris from the supernova. Image based on data obtained by the Hubble Space Telescope.
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