How can a world without air have an ionosphere? Somehow the Moon has done it. Lunar researchers have been struggling with the mystery for years, and they may have finally found a solution.
FULL STORY at http://science.nasa.gov/science-news/science-at-nasa/2011/14nov_lunarionosphere/
A video version of this story is available at http://www.youtube.com/watch?v=_zSrP4MacFE
