Massive Star Explosion: Supernova SN2007bi Visible Two Years Later

Massive Star Explosion: Supernova SN2007bi Visible Two Years Later
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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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