When Rosetta sniffed the gas around Comet 67P, it found a cloud that would have smelled of rotten eggs, ammonia and bitter almonds — and hidden in that cosmic stink were some of the chemical ingredients that may have helped life begin on Earth - Space Daily

Between 2014 and 2016, the European Space Agency’s Rosetta spacecraft flew alongside Comet 67P/Churyumov-Gerasimenko and analysed the gas streaming off it. The list of compounds it found reads like a catalogue of unpleasant smells: hydrogen sulphide (rotten e…