The absence of antimatter in the universe is a major puzzle for physicists from "summary" of Antimatter by Frank Close
The question of why the universe is predominantly made up of matter rather than antimatter has puzzled physicists for decades. Antimatter is the mirror image of matter, with particles having the same mass but opposite charge. When matter and antimatter meet, they annihilate each other in a burst of energy. In the early universe, matter and antimatter should have been created in equal amounts during the Big Bang. However, if this were the case, they would have annihilated each other, leaving behind only radiation. Yet, we see a universe filled with matter, from stars and galaxies to planets and people. The absence of antimatter raises fundamental questions about the nature of the universe and the laws of physics that govern it. Scientists have proposed various theories...
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