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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In 2016, we confirmed that the spectral emissions of antihydrogen perfectly match the spectral emissions of hydrogen. When white light is emitting from a hydrogen star, it emits photons of ALMOST every color, but there are a few colors that are not emitted because the hydrogen is reabsorbing them in particular.
Since we primarily use those spectral emissions to estimate the chemical makeup of stars, we are probably completely in the dark about whether they are matter or antimatter. All we’d have to go on is the assumption that we know massive amounts of matter can exist (because of our solar system) but we’ve never confirmed that massive amounts of antimatter formed at any point after the big bang.
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