Mercury’s surface might not be quite so terra firma, at least on geologic timescales.
The closest planet to the sun is a world sculpted by volatiles — ephemeral compounds that can freeze, flow or float into space over time, analogous to water on Earth. Salt, the primary volatile on Mercury, appears to have reshuffled the planet’s landscape over billions of years and might even flow — very slowly — in glacierlike landforms, researchers report in the November Planetary Science Journal. The volatile could possibly even form habitable niches deep underground, the authors speculate.
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