NASA’s Perseverance rover just snapped some wild pics of massive, wind-carved “megaripples” on Mars. These sandy ridges, up to 3 feet high, are leftovers from when Mars had a thicker atmosphere and crazier winds. Scientists say some still creep along the surface—just super slowly! The rover’s digging into what these ripples are made of, and it could help future astronauts survive on Mars. Who knew sand could spill so many secrets? #Science #Mars #NASA