This year, Nature celebrates its 150th birthday. To mark this anniversary we’re rebroadcasting episodes from our PastCast series, highlighting key moments in the history of science.
In the early 1990s, a team of astrophysicists led by Carl Sagan looked at data from the Galileo spacecraft and saw the signatures of life on a planet in our galaxy. Historian of science David Kaiser and astrobiologists Charles Cockell and Frank Drake discuss how we can tell if there is life beyond the Earth – and how optimism, as well as science, is necessary for such a venture.
This episode was first broadcast in October 2013.
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