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  • Mercury still shrinking as it cools

    From Mortimer Houghton@21:1/5 to All on Wed Oct 4 00:26:51 2023
    https://arstechnica.com/?p=1972962

    Grabens observed on Mercury by spacecraft MESSENGER indicate that the
    planet continues to cool and shrink as it does so.

    --
    There are the known knowns, things we know we know;
    and the known unknowns, things we know we do not know;
    but there are also the unknown unknowns,
    those things we don't know we don't know.

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