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>The primary mechanism is radiation exchange with 2 pi steradians of a
>3 kelvin blackbody plus high resistance thermal conduction pathways
>to the ground and the (still) air.
>
>--
>John Mallinckrodt mailto:ajm@csupomona.edu
If we are to believe John, a vacuum enclosure with a suitably
transparent lid would allow a black chromed copper square (say), if
well insulated at sea-level, to cool to 5 or 6 K overnight?