An article published in “The Astrophysical Journal” describes the detection of a companion of the type IIb supernova known as SN 2001ig. A team of astronomers used the Hubble Space Telescope to discover the first case of a binary system in which one of the stars survived when its partner exploded into a supernova. The two stars were not just close but there was an interaction that had an influence on the supernova.