NASA's Curiosity rover drives on after crossing Martian dune

NASA's Curiosity Mars rover is continuing its traverse toward enticing science destinations after climbing over a dune spanning a gap in a ridge.

Marks on Martian dunes may be tracks of dry-ice sleds

NASA research indicates hunks of frozen carbon dioxide - dry ice - may glide down some Martian sand dunes on cushions of gas similar to miniature hovercraft, plowing furrows as they go.