Question

Where did all the antimatter go

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Answer 1

Answer:

But we exist, and therefore something must have happened to allow matter to survive and antimatter to all but disappear. Scientists suspect that a tiny portion of matter—about one particle per billion—survived from the early universe to create all the planets, stars and galaxies we see today.

Explanation:

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Answer 2

One of the biggest mysteries in physics is why the universe is made entirely of matter, even though equal amounts of matter and antimatter should have been created during the big bang. All the matter and antimatter particles should have annihilated with each other since then, leaving only photons, but somehow one matter particle in a billion or so has survived to create the universe as we know it. Physicists at the BaBar experiment at Stanford in the US and the Belle experiment in Japan have now, for the first time, directly measured the amount of matter–antimatter asymmetry allowed by the Standard Model of particle physics.