How many contactable alien civilisations are out there?
Science Weekly - A podcast by The Guardian
Could there really be other civilisations out there in the Milky Way? Nicola Davis talks to Prof Chris Conselice, whose recent work revises the decades-old Drake equation to throw new light on the possibility of contactable alien life existing in our galaxy. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>
