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I've wondered the same too. IIRC there was a recent discovery that antimatter still exhibited positive gravity, and it's long been known that photons are their
by colanderman 15y ago
I've wondered the same too. IIRC there was a recent discovery that antimatter still exhibited positive gravity, and it's long been known that photons are their own antiparticles. How then is it possible to observe that distant galaxies are not made of antimatter?
- keeperofdakeys 15y agoAn interesting thought experiment is that if a machine was made that turned everything in this galaxy into anti-matter, including everything that comes into our universe, is there any possible way to verify that the change did indeed occur. Or, is the only different between anti-matter and matter the fact that they are opposite in the same ways.