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For an eternity, our universe lay dormant—a frozen, featureless netherworld. Then, about 15 billion years ago, the cosmos got an abrupt wake-up call.
According to the standard theory, the universe was born some 15 billion years ago in a hot, expanding fireball, an event scientists call the Big Bang. The universe then underwent a brief spurt of faster-than-light expansion, called inflation, before settling down to the much slower, steady expansion observed today.
If a theory ain't broken, why fix
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