Ask Ethan: Is our Universe truly matter-dominated?
<p>Here in our own backyard, matter is common, while antimatter is rare. In fact, except for high-energy reactions that produce equal amounts of matter and antimatter — things like electron-positron pairs, for example — there’s absolutely no antimatter found anywhere that we look. All of the planets, stars, gas, dust, and more within our Milky Way is made of matter and not antimatter. All of the galaxies we look out at beyond our own are made of matter and not antimatter. Galaxy clusters and the large-scale cosmic web point to everything being made out of matter and not antimatter. Somehow, all of the normal stuff, the stuff of the Standard Model, is all “matter” in our Universe, with practically no antimatter at all.</p>
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