NASA rover finds 'building blocks of life' on Mars
NASA's Curiosity rover, which landed on Mars in 2012, has found organic molecules containing carbon and hydrogen besides traces of oxygen and sulphur in three-billion-year-old rocks. Commonly associated with life, organic molecules can also be created by non-biological processes and are not necessarily indicators of life, NASA remarked. NASA will send another rover in 2020 to dig deeper on Mars.