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Antimatter falls down, not up: CERN experiment confirms theory
(www.nature.com)
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this post was submitted on 27 Sep 2023
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Because one common assumption was that the universe might contain as much antimatter as matter.
Which begs the question: Where did it go? We would notice a huge amount of annihilation reactions in the solar system.
"Antimatter falls up" (is gravitationally repelled instead of attracted by normal matter) was an easy hypothesis to explain that.