The Curiosity rover found high levels of methane gas and other organic matter in rock . It could have been produced by microbes , but there is no concrete evidence of that . They also show that the planet is still chemically active . Comment: But existence of organic compounds on Mars are sign it may have supported life before .
The Curiosity rover found high levels of methane gas and other organic matter in rock . It could have been produced by microbes , but there is no concrete evidence of that . Comment: But existence of organic compounds on Mars are sign it may have supported life before .