GREENBELT, Md., Nov. 29 (UPI) -- NASA says it Messenger spacecraft provide compelling support for a long-held theory Mercury harbors abundant water in its permanently shadowed polar craters.
The conclusion is supported by Messenger measurements of excess hydrogen at Mercury's north, the reflectance of Mercury's polar regions and the first detailed models of the surface and near-surface temperatures of Mercury's north polar regions, the space agency reported Thursday.