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Mercury still shrinking as it cools

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Mortimer Houghton

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Oct 3, 2023, 8:26:54 PM10/3/23
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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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