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almost everyone in astronomy has the utmost confidence in this thing called dark matter.. it explains how galaxies behave temperature fluctuations in the cosmic microwave background and a number of related things too technical to explain .. its out there and has a huge impact on the universe and generally how the universe is like it is enough for us to exist. in a way its like the higgs boson a key to our models of the universe but a key we havent actually seen in a lab..
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