How physics lets us rewind time to the beginning of the universe. Get your own Space Time t-shirt at http://bit.ly/1QlzoBi Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! null We pretty much know for sure that the universe was once extremely small, and extremely hot. And we know that something set it in motion, expanding rapidly and continuing to do-so today. But the actual moment of ‘the Big Bang’ is still a bit of a grey area within physics. The theories of general relativity and quantum mechanics disagree on this pivotal “beginning of time,” and physicists continue to search for an all-encompassing theory to unify the study of our universe. On this week’s Space Time, we begin to discuss the current state of the Big Bang Theory, and where it could go from here. FURTHER READING: Overview of Big Bang theory https://en.wikipedia.org/wiki/Big_Bang Timeline of the Big Bang https://en.wikipedia.org/wiki/Chronol... MinutePhysics made a truly superb video on what the Big Bang really is: null. Kurzgesagt does a great job describing some of the events of the very early universe: null. _____________________ COMMENTS: Brendon Binns https://www.youtube.com/watch?v=gw-i_VKd6Wo David Mulyk https://www.youtube.com/watch?v=gw-i_VKd6Wo John Proctor https://www.youtube.com/watch?v=gw-i_VKd6Wo Lawrence Stanley null. ______________________ Written and hosted by Matt O’Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)