Scientists just found river deltas in Mars’ giant Valles Marineris canyon, and it’s basically proof that half the planet was once covered by a massive ocean. These deltas look just like the ones where rivers meet oceans on Earth! High-res images show shoreline markers and even dried-up cracks. Imagine Mars with beaches and waves instead of just red dust. Does this change how you think about life on Mars? Drop your wildest theories below! #Science #Mars #SpaceNews