NASA’s Perseverance Rover Spots Megaripples, Proof Mars’ Soil Is Still Shifting

NASA’s Perseverance rover has discovered striking megaripples — giant Martian sand waves — at a site called Kerrlaguna in Jezero Crater. These formations, about a meter tall, are larger than Earth’s beach ripples but smaller than the biggest dunes. Scientists say they formed when Mars had a thicker atmosphere and stronger winds, and many now appear frozen in time, shifting only about a meter every nine Earth years.