The rocky, mostly dry surface of the planet Mercury may once have been roiling with hot magma, a new study based on observations by NASA's Messenger spacecraft suggests NASA's Messenger, the first Mercury orbiter, has made its home around the closest planet to the sun since March 2011. From its close-up perch, the probe identified two distinct types of rocks that compose the planet's surface, which scientists were at a loss to explain. Now, experiments in a lab at MIT suggest Mercury's puzzling...
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