'Stupendously large black holes' aren't a major component of dark matter, study finds
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Black holes more massive than entire galaxies are not a major component of the mysterious dark matter that's thought to make up most of the matter in the cosmos, a new study finds.For decades, to explain why galaxies do not spin apart at the speeds at which they whirl, scientists have suggested the existence of an unseen substance known as dark matter, whose gravitational pull helps keep galaxies together. Dark matter is thought to make up about five-sixths of all matter in the universe. Much re
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