Extreme sports taking on place on Mars? How about snowboarding – or actually sandboarding –down Martian dunes on a cushion of carbon dioxide? Sounds fun, and this might be happening already – sans the humanoid snowboarders, however. Scientists have been wondering what caused unusual hillside grooves on Mars, called linear gullies. New research and test … Continue reading "Weird Tracks on Mars Could be Caused by Moving Dry Ice"