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Questions about the source or effects of the matter that makes up 85% of the matter in the universe but appears to only interact gravitationally.

16 votes
3 answers
2k views

How do we know dark matter/dark energy exists?

I've never quite understood the theory behind why dark matter and dark energy exist. I know it has something to do with gravitational pull being stronger than what we calculate it SHOULD be, could som …
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