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Supernovae and the fusing of elements Researchers at The University of Sydney have discovered an extremely young supernova, the corpse of a star that exploded around 1,000 years ago. Supernovae are the result of stars like our sun exploding at the end of their life. When they do, light is emitted equivalent to half a trillion stars. The last supernova in our galaxy was in 1604. Records exist of an extremely bright sky at that time. But it´s a mystery as to why we´ve not seen one since. All elements heavier than iron were made in supernovae. Bryan Gaensler describes the fusing of elements in the