firstly, how do we know this? and secondly, would it not be possible that either antimatter and matter were produced in separate regions or randomly and if randomly it makes sense that in any given region only one or the other would predominate?
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If there were different regions, some with matter and others with antimatter, we would see the telltale signs of annihilation at the boundaries between them, there is none.
As to why there's only matter when both matter and antimatter should be produced in equal amounts, don't know, pretty big mystery.
asdee dsawee
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