The article discusses the four-year mission of the U.S. National Aeronautics & Space Administration (NASA) Messenger Mercury orbiter which began in March 2011. Topics include its discovery of volcanic material covering most of Mercury's surface, its observation of asymmetry in Mercury's magnetic field offsetting it towards its north pole, and its detection of flat and shallow bright spots, named "hollows," covering Mercury's surface. A timeline of the Messenger's mission to Mercury is presented.
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