This is a cool new result. Astronomers went looking for a giant black hole in the center of a globular cluster (a clump of very old stars). Instead, they found what appears to be a SWARM of smaller black holes -- the kind made when massive stars die.https://esahubble.org/news/heic2103/?lang …
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The thing is (pardon me if I'm mistaken) that a cascade effect like that wouldn't happen JUST because of the presence of black holes. A black home doesn't have GREATER gravity than the star it essentially replaces; it's just compacted into a much smaller area.
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The inverse square rule still applies. If two widely separated stars become black holes, the gravitational interaction between them doesn't change. If the sun was instantly replaced with a 1-solar-mass black hole, Earth wouldn't be sucked in. It would just continue orbiting.
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There is some evidence for IMBHs in other observations (e.g., https://esahubble.org/news/heic2005/ ). And merging a swarm of black holes is actually really difficult to do — what you expect to happen is a few merge and in the process fling others out. Actually collapsing a lot is hard.
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Ok cool, thanks for the knowledge!
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