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A comment on Ten things you might not know about antimatter (2015).
Today we know little bit more about antimatter-gravity relation[0][1].
It looks like, matter and antimatter behave in the same way under the influence of gravity. So antimatter does not "fall up".
[0] https://home.cern/news/news/physics/base-breaks-new-ground-m...
[1] https://www.nature.com/articles/s41586-021-04203-w
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Today we know little bit more about antimatter-gravity relation[0][1].
It looks like, matter and antimatter behave in the same way under the influence of gravity. So antimatter does not "fall up".
[0] https://home.cern/news/news/physics/base-breaks-new-ground-m...
[1] https://www.nature.com/articles/s41586-021-04203-w