How many contactable alien civilisations are out there?

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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>