this post was submitted on 27 Sep 2023
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Why would anyone think it would fall up?
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.