Martian microbial underworld imaged on Arsia Mons (click to enlarge) that is estimated to be 160 to 200 ft (50 - 60 m) across. It is hypothesized that this is a skylight into a lava tube that could potentially protect life - if it exists - from "radiation, extreme temperatures and dust storms" that occur on the surface of Mars.Link to technical abstract.
Image credit: NASA/JPL.
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