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Star outweighed any known in Milky Way

Supernova was a big blast, challenging theories of how stars live and die

To make a truly spectacular stellar explosion, you gotta have heft. And according to a motherlode of data on a supernova dubbed SN 2007bi, the exploding star originally tipped the scales at more than 200 times the mass of the sun. That would make the star more massive than any known in the Milky Way.

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