Big Bang: How We Are Trying to ‘Listen’ to It—and the New Physics It Could Unveil
Exactly what happened at the beginning of the universe, 14 billion years ago, is one of the greatest mysteries in physics; there’s no simple way to probe it. That’s because, in its early stages, the universe was filled with a dense plasma—a gas made out of charged particles including electrons and protons (particles that comprise the atomic nucleus alongside neutrons).
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