Science writer and producer Piers Bizony takes a retrospective look at NASA’s Space Shuttle Program, astrobiologist Lewis Dartnell discusses space bacteria and the possibility of extra-terrestrial life and we ask Astronomer Royal Lord Martin Rees if we’ve any hope of getting to the red planet.

Presented by Thea Cunningham and featuring reporters Camila Ruz, Thomas Welch, Andrew Bailey and Ed Prosser.