Is the Universe Infinite or Finite? // TRAIN BRAIN

Is the Universe Infinite or Finite?

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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.
This video comes with a quiz which you can take here: https://quizwithit.com/start_thequiz/1732946181161x554537175406877760
The Kurzgesagt video is here: https://www.youtube.com/watch?v=isdLel273rQ
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#physics #space #universe

Sabine Hossenfelder

As simple as possible, but not any simpler! Science and technology updates and summaries. No hype, no spin, no tip-toeing around inconvenient truths. Currently 5 videos a week (Tue-Wed-Thu and Sat-Sun). Early access for channel members. Sabine Hossenfeld...

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