"Antimatter galaxies will look exactly the same as matter galaxies. This is because the photon is its own antiparticle. However, we can look for other clues. Searches have been made for antimatter in the cosmic radiation and for the indirect traces of cosmic matter-antimatter annihilation in the extragalactic γ-ray background radiation."
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4 A Locally Asymmetric Domain Cosmology
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Antimatter
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