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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We don’t know. However it does appear that matter out populates antimatter in the universe, leading to the theory that in the early universe matter and antimatter were created not in a 1:1 ratio, but rather 1000001:1000000. We are currently searching for evidence to confirm of dispute this. One such experiment is a satellite detecting charged particles. It has detected protons, alpha particles, and electrons for regular matter, and anti protons and positrons for antimatter. It has not detected any anti alpha particles, but if it were to even detect one it would suggest that large amounts of antimatter exist out there in the universe.
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