TED TalksBrian Greene: Is our universe the only universe?
TV-PG
2012 • E31 Apr 23, 2012 15mIs there more than one universe? In this visually rich, action-packed talk, Brian Greene shows how the unanswered questions of physics (starting with a big one: What caused the Big Bang?) have led to the theory that our own universe is just one of many in the "multiverse."