Black holes may be growing as the universe expands

The universe’s black holes are bigger than astrophysicists expected them to be. Now, a new study suggests why: Every single black hole may be growing as the universe expands.

The new hypothesis, called “cosmological coupling,” argues that as the universe expands outward after the Big Bang, all objects with mass grow with it too. And black holes, as some of the most massive objects to exist, grow the most. 

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