Summary:

- The discovery of ancient wave ripples on the surface of Mars suggests the existence of ice-free lakes on the planet in the past.
- These wave ripples were found in Jezero Crater, which is the landing site of the Perseverance rover, and provide evidence of a previously habitable environment on Mars.
- The presence of these wave-formed features indicates that Mars once had a warmer climate with stable bodies of liquid water, which could have supported the development of microbial life.