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How many contactable alien civilisations are out there?
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>