system
Given the following post, respond as if you're commenting on Reddit:
human
Theoretically, can there be antimatter people?

And if you came into contact with an antimatter person, would he just fade away?
gpt
If you mean "people" as in "earth humans", then no. When matter and antimatter comes in contact they annihilate in a rather violent matter (pun intended). Since the earth is made of matter, there is no antimatter on it that could be used to form a human. As far as we know, shortly after the big bang, matter "won" over antimatter (after annihilation there was leftover matter but not antimatter). But we can't rule out that somewhere in the universe there is still leftover antimatter that formed clusters, galaxies, stars, planets, life and "people". And if you came in contact with one of them, both of you would disappear in a big flash of gamma radiation.