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Negative-Relative402 t1_j6sf6iw wrote

Do we actually know what anti matter is? OR is it just that we know that there is matter not accounted for in the universe that we can't see and also there is gravitational lensing and we use the word antimatter to explain that BUT don't actually know?

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abeinszweidrei t1_j6sg22l wrote

I think you're confusing anti matter with dark matter.

But for dark matter you're pretty much right. For example, we can see things orbiting with some speed and can deduce the mass needed for such an orbit. The mass of stuff we see is mich smaller than the needed mass, so apparently there is some stuff that is "dark", i.e. doesn't shine or reflect light, also doesn't absorb. More like glass in this respect, or air. The light just doesn't care about it being present. So physicists started calling it "dark matter" as it doesn't shine, plus it fits well with the fact that we don't know yet what it is.

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Varsect t1_j6u2ez0 wrote

That's not anti matter. It's dark matter. And if it was anti matter then we wouldn't exist at all. And yes we don't know what it is.

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