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Is the universe really infinite? Or could it close back on itself like a sphere? If it’s infinite, how can it expand? And is it true that there might be copies of you in it? Today I want to explain how much we know about those questions and what the expansion of space has to do with Hilbert's Hotel.

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The Kurzgesagt video is here:    • The Paradox of an Infinite Universe  

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#physics #space #universe