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I would like to start be saying I'm no Physicist.

I was wondering if known and mostly unknown black holes could be the reason for the "expanding" of the universe.

Qmechanic
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calc8
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Welcome to the stack exchange. The quick answer to your question is no, black holes can not contribute to the expansion of the universe. Black holes are very localized and their gravity is no greater than the sum of the stars that they have collapsed from. Do a google search and you will find lots on this. However, there is a new theory that the opposite is true, that expansion of the universe might cause black holes to grow. The main reason is that because everything in the universe is moving, black holes are more likely to bump into other stars or black holes, and thus grow. Take a look at this easy to read paper: Universe Expansion Directly Impacts Black Hole Growth

foolishmuse
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