NASA’s Curiosity rover found evidence that Gale crater once contained an ancient freshwater lake.
Curiosity landed inside Gale crater on 6 August 2012 and began examining layered rocks at the base of Mount Sharp. Sedimentary textures and chemical measurements showed that liquid water once occupied parts of the crater and created environments that could have supported microbial life.
The rover’s instruments detected minerals and rock chemistry consistent with changing lake conditions, including periods when the water was relatively clear and chemically suitable for life as we know it. Curiosity was designed to assess ancient habitability, not to detect present-day organisms.
Curiosity is often confused with Perseverance, which landed in Jezero crater in 2021 and focuses heavily on collecting samples for possible return to Earth. Curiosity remains an active Mars science mission.