Before Messenger began it's orbit around Mercury in 2011, less than half of the planet's surface had been mapped, and even that small amount had been done with 1975 technology...Now, scientists can say they've accurately mapped the entire surface, revealing many secrets about the planet's past and present...
http://www.space.com/20086-mercury-map-nasa-messenger.html
and some more interesting finds from a month or so ago...
http://www.guardian.co.uk/science/2013/feb/15/mercury-dynamic-complex-nasa
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