‘Clearest sign of life ever found on Mars,’ says Nasa

Spots on rocks on Mars offer the “clearest evidence” yet that ancient life once thrived on the Red Planet, Nasa has said. Last year, the space agency’s Perseverance rover discovered rusty markings on an ancient dry riverbed within the Jezero Crater, a large impact basin just north of the Martian equator. Scientists suspected that the colourful spot...