Why matter came to dominate over antimatter is a major mystery. So if antimatter and matter were created in equal amounts and they behave identically, all the matter and antimatter created at the beginning of time should have annihilated on contact, leaving nothing behind. Scientists have measured the properties of particles and antiparticles with extremely high precision and found that both behave identically. As the universe cooled and expanded, particles of both matter and antimatter were produced. In the first moments after the Big Bang, only energy existed. ![]() Antimatter is also at the heart of a mystery about why the universe exists at all.
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