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Massive lava flows may have given rise to two distinct rock types on Mercury's surface.

By analysing Mercury's rocky surface, scientists have been able to partially reconstruct the planet's history over billions of years. Now, drawing upon the chemical composition of rock features on the planet's surface, scientists at MIT have proposed that Mercury may have harboured a large, roiling ocean of magma very early in its history, shortly after its formation about 4.5 billion years ago.
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Mercury Stirs: The Iron Planet Is Livelier than We Think

In 2004 NASA launched the Messenger spacecraft, which arrived in orbit around Mercury a year ago and has been surveying the planet with laser altimeters, gravitational instruments, cameras and more ever since. Now, a pair of papers appearing in the online edition of Science make it clear that the long overdue return was amply worth the effort. Mercury, it turns out, is a far more dynamic - and far less predictable - place than we once believed.
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