Plus advent calendar door #22: Bang, crunch, freeze and the multiverse


The cosmic microwave background temperature fluctuations. Find out more in our podcast. Image courtesy NASA.

What's a multiverse? What's the future for intelligent life? And what happened 380,000 after the Big Bang. At Stephen Hawking's 70th birthday conference we talked to physicists David Spergel and Raphael Bousso to find out more. You can also read the accompanying article.

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