Brian Cox on the 6 Music Breakfast Show discussing early Earth and how we recognise living planets from light years away

Dec 05, 2012, 10:27 AM

Scientists have determined the density of air on Earth 2.7 billion years ago – hear Brian talk about the Earth when it span more quickly, the moon was closer, there was no oxygen and the oceans were acidic. And how we recognise living planets from lights years away.

You can listen to the whole interview here, in which Brian admits to illegally taping music from the radio – the guy’s a rebel:

http://www.bbc.co.uk/podcasts/series/keaveny