Evidence of life on Mars could have been found by Nasa’s Curiosity Rover.
Mysterious spikes of methane that cannot easily be explained by geology or other theories have been found by an instrument on the robot, which landed on the planet in 2012. Scientists can’t be sure what is causing the spikes, but it is possible that it could be very small, bacteria-like living organisms.
If the gas is coming from living microbes then it would mark one of the biggest discoveries in history. On Earth, 95% of methane comes from microbial organisms, but there are many non-biological processes that can also generate the gas.
Scientists have said that the rover now has to test and re-test the possibility of life, ahead of an unmanned mission in 2020 that would look for the source of the methane… see more
source: independent UK