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in reply to @alyaza's post:
oh you can make much more fucked up stuff than anti-matter atoms
my favorite trick you can pull is being able to make an atom with a single electron orbiting a single antitau as the "nucleus". the antitau is short-lived and decays into an antielectron quite quickly, at which point they annihilate each other, but the fact you can do it at all is wild
also, if you think antimatter is fucked up, wait till you hear about supersymmetry
in reply to @alyaza's post:
Fun side effect of this is that we (pretty much) can't tell matter from antimatter at a distance. Like, there could be entire galaxies where antimatter predominates rather than matter, and we probably wouldn't know unless some physical stuff came from there to here (in which case we'd find out very quickly lol)
actually, interestingly, we know all the galaxies we see are matter!
The intergalactic medium is thicker than we expect - still about a particle per cubic meter. So if there was an antimatter galaxy next to a matter one, we would see a gigantic-as-hell glow between them as the antimatter and matter combine
Unfortunately, we don't see it ::< so, no antimatter galaxies
There's another way to tell, assuming there's also intelligent life there that can communicate with you & can perform particle-physics experiments, as detailed by a great MinutePhysics video: there's a very particular interaction of the weak nuclear force that violates both mirror-image and matter/antimatter symmetry, and with that you could communicate both left vs. right and matter vs. antimatter unambiguously