“We know collapsing stars create black holes, but making one from a star a thousand times larger than our own is highly unlikely,” he said. The most massive stars in the universe, in fact, are only about 70 times our Sun’s mass.
Instead, Strohmayer and other astronomers think stars in dense clusters feed small black holes with hot gas, fattening them up into larger sizes. “Or the merging of several black holes themselves could form a bigger one,” he said.
But the middle child of the black hole family might also be created during the formation of super-massive holes. Strohmayer said they could be “remnants of a big merger of black holes” that break off.
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