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Cool Worlds: How Big Is The Universe?
Columbia astronomer David Kipping takes a question that sounds childish and shows why it is one of cosmology's hardest. He separates the observable universe from the whole thing, then asks what the evidence allows: is space infinite, or finite and folded back on itself, and if so, in what shape? Half an hour, fact-checked by a working cosmologist, with no hand-waving where the numbers matter.
About this channel
Space, astronomy, exoplanets, astroengineering and the search for extraterrestrial life & intelligence. The Cool Worlds Lab (http://coolworldslab.com), based at the Department of Astronomy, Columbia University, is a team of astronomers seeking to discover and understand alien worlds, particularly those where temperatures are cool enough for life, led by Professor David Kipping.
