Alan Guth - How Vast is the Cosmos? HD

For more videos on "How Vast is the Cosmos?" click here http://bit.ly/1EMzFw2 For more on information and video interviews with Alan Guth click here http://bit.ly/1Fn0oN1 To buy episodes and seasons of Closer To Truth click here http://bit.ly/1LUPlQS Everyone knows that the universe is huge, but no one could have imagined how staggeringly immense the universe, or multiple universes, may actually be. It stops your breath. How to get a measure of the size of the cosmos? What would it mean if the cosmos were literally infinite?