Quarantine required: The search for life on mars

THERE IS A lot that Nasa's Perseverance rover has on its to-do list. Flying helicopters is only a small part of it. The rover, fitted with seven cutting-edge instruments for analysing rocks, the atmosphere and weather, is ultimately searching for signs of past and present life on Mars. But it will not do it on its own. The Perseverance mission is only the first step in a much greater project. Using its small drill, Perseverance will excavate promising pieces of Martian soil and store them in small tubes on the planet's surface for another rover to retrieve at the end of this decade.