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
Space is not completely, entirely empty. At some point between a galaxy made of anti matter and a galaxy made of matter (or even at the scale of galaxy clusters) you are going to have a crossover point.
Even if this crossover point is in deep space, there are going to be some number of anti-particles colliding with some number of particles, which would create possibly detectable bursts of energy on a somewhat regular basis.
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