Word: mercurian
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Dates: during 2000-2009
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MESSENGER will study these and other Mercurian curiosities when it arrives at the planet in 2011. Completing a full orbit in 12 hours and swooping as close as 124 miles to the surface, it will need just six months to photograph the entire globe. After a three-decade wait for a return visit, that ought to seem like no time at all. --By Jeffrey Kluger...