Tycho Brahe's 1572 supernova classified

One of the most famous supernovae in the history of astronomy, Tycho Brahe's supernova of 1572 (SN 1572), first identified more than 400 years ago, is a normal type Ia supernova, according to research published in the current (4 December 2008) issue of Nature. An international team of astronomers, led by Oliver Krause of the Max Planck Institute for Astronomy, have used light echoes as a time machine to unearth secrets of one of the most influential events in the history of astronomy...

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