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High resolution images of Mercury's surface, from the MESSENGER spacecraft,reveal many bright deposits associated with irregular, shallow, rimlessdepressions whose origins were attributed to volatile-related activity, butabsent information on the nature and origin of that volatile matter. Here Idescribe planetary formation, unlike the cited models, and show that primordialcondensation from an atmosphere of solar composition at pressures of oneatmosphere or above will lead to iron condensing as a liquid and dissolvingcopious amounts of hydrogen, which is subsequently released as Mercury's coresolidifies and escapes from the surface, yielding the observed pit-likefeatures with associated highly-reflecting matter. The exiting hydrogenchemically reduces some iron compound, probably iron sulfide, to the metal,which accounts for the bright deposits.

Hydrogen Geysers: Explanation for Observed Evidence of Geologically Recent Volatile-Related Activity on Mercury's Surface