Babbage: Life on Mars?

Three nations set out on separate missions to shed light on a question that astronomers have been asking for centuries—is there life on Mars? Alok Jha asks leading scientists about how their missions will search for signs of life on the red planet. And, why those investigating it should avoid irreversible damage to a potentially pristine ecosystem.Please subscribe to The Economist for full access to print, digital and audio editions:www.economist.com/podcastoffer Hosted on Acast. See acast.com/privacy for more information.