If the big bang happened 13.8 billion years ago, and the universe is 93 billion light years in diameter, how did the universe expand faster than light?
In: Physics
The Universe is actually not 93 billion light years in diameter. That’s only the *Observable* Universe, which is the portion of the Universe that is potentially observable from Earth since light would have had time to travel from there to Earth since the Big Bang. The entire Universe is much larger (at least 23 *trillion* light years across according to Wikipedia) and possibly infinite.
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