Elusive medium-sized black holes can form in dense ‘nurses’

The researchers found that elusive intermediate-mass black holes can form in dense star clusters containing anywhere from tens of thousands to millions of tightly packed stars, called “globular clusters.”

An intermediate-mass black hole has a mass between 100 and 10,000 suns. They are heavier than solar-mass black holes, which have a mass range between 10 and 100 solar masses, but lighter than supermassive black holes, which have masses equivalent to millions or even billions in the sun.

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