re: Do you think space is infinite?

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Why are all of the planets, stars, galaxies round? So one would assume that the universe is also round. Gravity and rotation is the reason that they are all round.

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Not all galaxies are round. Dark Matter seems to determine the shapes of galaxies.

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So if the universe is round and rotating what is it rotating around?

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Transitive properties don't apply to the shape of the Universe. There are many competing ideas about its shape. The current most popular theory, although not by much, is that it's flat.