Date- 1st Nov 11 Source- http://carnegiescience.edu/multimedia_content 'The MESSENGER spacecraft has shown scientists that Mercury doesn't conform to theory. Its surface material composition differs from both those of the other terrestrial planets and expectations prior to the MESSENGER mission, calling into question current theories for Mercury's formation. Its magnetic field is unlike any other in the Solar System, and there are huge expanses of volcanic plains surrounding the north polar region of the planet and cover more than 6% of Mercury's surface.'
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