An unknown process is causing Mercury's surface to swell, according to new data from NASA's MESSENGER probe. | NASA/JHUAPL/CIW-DTM/GSFC/MIT/Brown University. Rendering by James Dickson and Jim Head

Mystery Rising Within Mercury

Mystery is rising within Mercury. Learn why mystery is rising within Mercury and find out about the extra solid layer of iron-sulfide in its core.

Published On 03/21/2012
3:00 AM EDT