The Sleepy Hollows of Mercury

Source - NASA Science News for Oct. 24, 2011

NASA's MESSENGER probe has discovered a surprise on Mercury: Something is digging "hollows" in the surface of the innermost planet.

FULL STORY at http://science.nasa.gov/science-news/science-at-nasa/2011/24oct_sleepyhollows/

A video version of this story is available at http://www.youtube.com/watch?v=gqg8PR2mVvc