The Universe contains matter but very little antimatter. It is thought likely that in the first moments after the big bang there were equal amounts of matter and antimatter produced.
[What happened to the antimatter?]
If they had stayed equal, then the Universe today would be very uninteresting because all the matter and antimatter would have disappeared by the process:
matter + matching antimatter
radiation
so no galaxies, no stars, no planets, and no people would be around today!
http://www2.slac.stanford.edu/vvc/experiments/babar.html
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