Symmetrical wave ripples identified with NASA’s Curiosity rover in ancient lake deposits at Gale crater provide a key paleoclimate constraint for early Mars: At the time of ripple formation, climate conditions must have supported ice-free liquid water on the surface of Mars. These features are the most definitive examples of wave ripples on another planet. ...

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Link :
https://www.nextbigfuture.com/2025/01/ancient-mars-had-ice-free-lakes-in-gale-crater.html