How do we know that there is more matter than antimatter? Isn’t it possible that some distant objects (maybe even entire galaxies) are made of antimatter?
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If there’s a region of space full of antimatter, then that region of space must share a border with the space we live in full of regular matter.
That border would glow brilliantly and we would see it in our telescopes, but we see no such border.
If it exists way beyond the borders of the visible universe, then we would have no way of knowing, but it would be very odd that it just happened to all be elsewhere.
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