In 2004, an international team of astronomers had, for the first time, observed a stellar "survivor" emerge from a double star system involving an exploded supernova. Supernovae are some of the most significant sources of chemical elements in the universe, and they are at the heart of our understanding of the evolution of galaxies. In this artist's view, the red super-giant supernova progenitor star (left) is exploding after having transferred about 10 solar masses of hydrogen gas to the blue companion star (right).
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