HUFFINGTON POST
03/18/2010 05:12 am ET Updated May 25, 2011

Massive Star Explosion: Supernova SN2007bi Visible Two Years Later

This breed of explosion has been long predicted, but never before seen. Like all supernovas, the blast is thought to have marked the end of a star's life. But in this case, that star may have started out with 200 times the mass of the sun.

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