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LIGO's Twin Black Holes Might Have Been Born Inside a Single Star http://bit.ly/1QJqL98

On September 14, 2015, the Laser Interferometer Gravitational-wave Observatory (LIGO) detected gravitational waves from the merger of two black holes 29 and 36 times the mass of the Sun. Such an event is expected to be dark, but the Fermi Space Telescope detected a gamma-ray burst just a fraction of a second after LIGO’s signal. New research suggests that the two black holes might have resided inside a single, massive star whose death generated the gamma-ray burst.

“It’s the cosmic equivalent of a pregnant woman carrying twins inside her belly,” says Harvard astrophysicist Avi Loeb of the Harvard-Smithsonian Center for Astrophysics (CfA).

Normally, when a massive star reaches the end of its life, its core collapses into a single black hole. But if the star was spinning very rapidly, its core might stretch into a dumbbell shape and fragment into two clumps, each forming its own black hole.

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