My limited understanding is that the only interactions we have with other galaxies is through photons, and that photons have no anti-particle (or are their own anti-particle). I’m also under the impression that the vast majority of galaxies are very far apart from each other and moving further away, so we wouldn’t be able to observe matter galaxies interacting with antimatter galaxies. How do we know that some of the galaxies we can see aren’t made of anti-matter? Would it be important if some of them were?
In: Physics
Were this the case, there would be a border between the ‘matter’ regions and ‘antimatter’ regions. Despite space being pretty empty, it is not nearly empty enough to prevent collisions at this border. The shear amount of energy being released at this border from the collisions would produce a ‘glow’ that should be visible from Earth.
This glow would likely not be visible light, but rather ionizing radiation. We could still detect it.
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