NASA rover takes a closer look at organic carbon on Mars
Using NASA’s Perseverance rover, scientists are getting a greater understanding of the nature of some of the organic carbon — the molecular backbone for all known living organisms — detected on Mars as they explore the question of whether Earth’s planetary neighbour ever harboured life. New research describes the structure of the organic carbon found last year by the rover in sedimentary rock that contained a potential biosignature — a possible sign of past microbial life. This mudstone formed perhaps between 3.2 and 3.8 billion years ago beneath a now-vanished body of water in Jezero Crater in the Martian northern hemisphere. Organic carbon can be a clue as to whether Mars ever harboured life because it serves as the chemical underpinning for the molecules that build DNA, cells and proteins. But its presence is not proof of life because it also can arise in nonbiological processes such as chemical interaction between rock and water. The detection of organic carbon in two rocks...