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What is the universe expanding into?

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Finally, we can return to the original question. In our old picture of the universe, the answer would be simple, although very unsatisfying. The collection of galaxies that make up the universe is moving through space; therefore, the universe is expanding into even more space than it already encompassed. read more

The short answer is that this is a nonsense question, the Universe isn’t expanding into anything, it’s just expanding. The definition of the Universe is that it contains everything. If something was outside the Universe, it would also be part of the Universe too. read more

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