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I've heard of type Ia supernovae. What are the other type I varieties?

TIM HUPP, ELKTON, VIRGINIA
Astronomers recognize three flavors of type I supernovae: type Ia, Ib, and Ic. Type Ia supernovae occur in binary systems, where matter from a normal companion star flows onto a white dwarf. The white dwarf gradually gains mass until it becomes unstable and explodes. Another possible source for this supernova type is the merger of two white dwarfs.

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