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While doing research for a term paper, Karin Sandstrom, a student at Harvard University, discovered a star in our own backyard that is on the brink of exploding in a supernova. It?s so close that if it were to blow up before moving away from us, it could wipe out life on Earth.
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An exploding star may have destroyed part of Earth?s protective ozone layer two million years ago, killing off some forms of ancient marine life. Narciso Benitez, of Johns Hopkins University, says the ?missing smoking gun? of a mass extinction that occurred far in the past was the revelation that a stellar cluster with many large, short-lived stars prone to producing supernovae passed near Earth?s solar system several million years ago.
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