asymmetry in the universe

Asymmetry in the universe refers to the fact that there's more matter than antimatter. Matter and antimatter are like mirror images, but when they meet, they annihilate each other. The universe's slight imbalance, where matter slightly outnumbers antimatter, allowed matter to dominate and form stars, planets, and life. This imbalance, called baryon asymmetry, is a key puzzle in cosmology, explaining why the universe exists as we see it today rather than being filled with equal parts matter and antimatter.