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?
In: 330
So we can tell if a given galaxy is made of matter or anti-matter.
Basically, we should be seeing a lot of gamma rays that aren’t explained by anything else if there’s a border between matter and antimatter.
And we simply aren’t seeing that. This means that basically everything we can see is matter.
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