Maybe we have it all wrong. What if there are equal amounts of matter and antimatter in the universe, but they’re all separated into different regions? The Earth and its immediate neighborhood are definitely made of matter, but what if there are other neighborhoods out there made of antimatter? Matter and antimatter are so similar that we can’t tell if a distant star is made of matter or antimatter just by looking at the light that comes from it. Both types of star would have the same nuclear reactions and generate photons the same way with the same energies.
