Astronomers See a Star Before it Exploded - Universe Today
Astronomers working with the Gemini observatory were able to make detailed observations of an aging star only a little while before it exploded as a supernova. The star was first imaged a year ago as part of a comprehensive survey of galaxies. When the supernova was discovered in June 2003, astronomers found out its precise position with the Hubble Space Telescope. They could then look back through the photos taken with Gemini, and spot the exact star that exploded - it was 10 times more massive, and 500 times larger than our own Sun.