NASA scientists think that sliding chunks of frozen carbon dioxide — dry ice — may be responsible for creating track marks on some Martian sand dunes. Which brings up a totally awesome idea: Snowboarding down a Martian sand dune on a block of dry ice.
NASA calls these strange formations linear gullies, and they measure anywhere from a few hundred feet to an astounding 1.6 miles (2.5 km) long. They were discovered on images beamed back from the Mars Reconnaissance Orbiter’s (MRO's) High Resolution Imaging Science Experiment (HiRISE) camera. Planetary scientists had never seen anything quite like it before, and it’s certainly not something that’s ever been seen here on Earth.