What could be past the 93 bilon light years we know of?
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if you want talk about the size of the universe, you first have to talk about its shape. the universe is (probably) not flat and that has profound implications for what is “past” the parts we know of. if you start walking on earth (and gain the ability to walk on water, i suppose), and keep going, eventually you will end up back at your starting point. when scientist talk about a curved space time, that is a very similar thing. it doesn’t make sense to talk about what is outside the universe, there is no such place.
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