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Multispectral imaging data collected by NASA's MESSENGER spacecraft during its first fly-by in January this year reveals that volcanism was one of the essential factors that contributed to the shaping of the surface of Mercury. The spacecraft was able to distinguish surface rock units that have been linked to lava flows, volcanoes and other geological features, as well as to confirm that many of the rocks on the surface are low in iron concentrations. The Mercury Surface, Space Environme... Read »