There may be a wealth of organic molecules on Mars. This could mean there was once life on the red planet.
New findings from Nasa's Perseverance rover may have found lots of the molecules in rocks at a place where a lake existed long ago.
The latest evidence comes from an instrument called SHERLOC. This is fixed to the six-wheeled rover's robotic arm. It enables scientists to make a detailed map of the organic molecules.
Still, the Nasa scientists are not sure what it means.
"Organic molecules are the building blocks of life as we know it, but they can also be formed from geological processes not directly related to life," says astrobiologist Sunanda Sharma.
