Messenger Reveals Mercury Mysteries

March 17, 2015 7:12 PM

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With just weeks left before it crashes into its host planet, NASA's Messenger spacecraft is making the most of its extremely low altitude and finding that Mercury isn't a completely dead world.

There's been so much planetary exploration going on — from Chang'e 3 on the Moon to Dawn reaching Ceres to New Horizons readying for its historic Pluto flyby — that we tend to overlook some of the spacecraft still doing their thing around other worlds. One of those is Messenger, which tomorrow celeb...

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