Dating the messenger

13-Dec-2017 11:58

Scattered sunlight gives sodium a bright orange glow, which was observed by the Mercury Atmospheric and Surface Composition Spectrometer to vary seasonally with Mercury’s distance from the Sun.

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Particularly high potassium concentrations were observed by MESSENGER's Gamma-Ray Spectrometer at high northern latitudes, as illustrated in the abundance map on the left side of the animation.Relatively high abundances of other volatile elements, including sulfur (right side of the animation), sodium, and chlorine, provide further evidence that Mercury is volatile-rich.