How do we know the universe will continuously expand and never contract?
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We don’t really know that, it’s one of a few theories based on what we’ve observed in the universe. Some people think the universe will reach a certain point and then shrink back in on itself, others think the expansion will just run out of steam and the universe will settle into whatever state it is at that time. There’s a lot of data and a lot of theories but we still don’t know the exact answer to a question like that.
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