Study Illuminates Star Explosion From 16th Century

From NYT > Science:

More than 400 years after Danish astronomer Tycho Brahe challenged established wisdom about the heavens by analyzing a strange new light in the sky, scientists say they've finally nailed down just what he saw. It's no big surprise. Scientists have known the light came from a supernova, a huge star explosion. But what kind of supernova?

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