MESSENGER Spacecraft Reveals New Information About Mercury

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Source: NASA RELEASE: 10-170 
Excerpt: WASHINGTON -- The first spacecraft designed by NASA to orbit Mercury is giving scientists a new perspective on the planet's atmosphere and evolution. ... MESSENGER conducted a third and final flyby of Mercury in September 2009 ... revealed the first observations of ion emissions in Mercury's exosphere, or thin atmosphere … and evidence of younger volcanic activity than previously recorded. ...During its first two flybys of Mercury, the spacecraft captured images confirming that the planet's early history was marked by pervasive volcanism. The spacecraft's third flyby revealed … cratered plains … younger than the basin they fill… the youngest volcanic deposits … yet found on Mercury,"  ... observations suggest the planet spanned a much greater duration volcanism than previously thought, perhaps extending well into the second half of solar system history." 

 www.nasa.gov/home/hqnews/2010/jul/10-170_Messenger_New_Info.html

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