This article and video report on investigations into how chunks of dry-ice could explain long gullies seen on Martian sand dunes: Marks on Martian Dunes May Be Tracks of Dry-Ice Sleds – NASA
This article and video report on investigations into how chunks of dry-ice could explain long gullies seen on Martian sand dunes: Marks on Martian Dunes May Be Tracks of Dry-Ice Sleds – NASA