Everything we know began in the big bang 14 billion years ago. A lot has happened since then, including a lot of expansion of human knowledge about outer space . We’ve come a long way since thinking that the Earth was the center of our solar system!
Today we know through observation that our universe is expanding. Physicist George Lemaitre predicted that the theory of relativity that came from Einstein meant that our universe was not stationary but growing. Even Einstein rejected this theory, but not long after he was corrected by observation.
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A Universe From Nothing - Book Summary
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