Berlin, Germany (SPX) Oct 15, 2025 Mysterious gullies carved into Martian sand dunes have long puzzled planetary scientists. Now, new experiments by Utrecht University Earth scientist Dr Lonneke Roelofs suggest they were dug not by flowing water or lifeforms, but by sliding blocks of solid carbon dioxide that explode and burrow as they sublimate under Martian conditions. Roelofs replicated the process in a controlled "Mars
