The Curiosity Rover May Have Discovered What Wiped Away Ancient Signs of Life on Mars
BEN TURNER, LIVE SCIENCE
17 JULY 2021
Evidence of ancient life may have been scrubbed from parts of Mars, a new NASA study has found.
The space agency's Curiosity rover made the surprising discovery while investigating clay-rich sedimentary rocks around its landing site in Gale Crater, a former lake that was made when an asteroid struck the Red Planet roughly 3.6 billion years ago.
Clay is a good signpost towards evidence of life because it's usually created when rocky minerals weather away and rot after contact with water – a key ingredient for life. It is also an excellent material for storing microbial fossils.