NASA Science News for June 11, 2013
New research suggests that some of the famous gullies on Mars are caused by slabs of dry ice gliding down sand dunes on cushions of gas similar to miniature hovercraft.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2013/11jun_snowboards/ (http://science.nasa.gov/science-news/science-at-nasa/2013/11jun_snowboards/)