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Stephen Wolfram answers audience questions about physics and astronomy as part of an unscripted livestream series. Questions include: Do all objects, including living things, emit radio waves? What is plasma? What's the likelihood there's another universe exactly like ours out there? What is a hypersphere? Is there a limit to how many dimensions you can have? Why do you have to acquire a certain speed to escape earth's gravity to get into space? See the full QaA video playlist on YouTube: https://wolfr.am/youtube-sw-qa