The Curiosity rover found high levels of nitrogen gas and other organic compounds in rock . It could have been produced by microbes , but there is no concrete evidence of that . Other chemical reactions can also produce organic compounds . The Curiosity rover 's tapping into organics in rock is the first find ever of life 's building blocks on Mars ' surface . But existence of organic compounds on Mars are sign it may have supported life before .
The Curiosity rover found high levels of nitrogen gas and other organic compounds in rock . It could have been produced by microbes , but there is no concrete evidence of that . Other chemical reactions can also produce organic compounds . But existence of organic compounds on Mars are sign it may have supported life before .