Early in its history, shortly after the Big Bang, the universe was filled with equal amounts of matter and “antimatter”—particles that are matter counterparts but with opposite charge. But then, as space expanded, the universe cooled. Today’s universe is full of galaxies and stars that are made of matter. Where did the antimatter go, and how did matter come to dominate the universe? This cosmic origin of matter continues to puzzle scientists.
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Source: Phys.org