Stephen Wolfram Q&A, Physics & Astronomy: Episode 4

Stephen Wolfram answers audience questions about physics and astronomy as part of an ongoing 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 Q&A video playlist on YouTube: https://wolfr.am/youtube-sw-qa