I know that when matter and antimatter collide, they eliminate each other. So it would make sense that none of the stars in our galaxy would be antimatter since it was all part of one big cloud at some point.
But if antimatter and matter behave more or less the same as matter, how much certainty do we have that distant galaxies aren’t composed of antimatter instead of matter?
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Nowhere in the observable universe have we found any evidence of structures made out of anti-matter. Mathematically, it should be there, but it’s not. You’re tangentially asking about one of the greatest mysteries in astrophysics / quantum mechanics.
We don’t know why it’s not there, we just know it’s not.
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