The physical mechanism is radiative cooling: https://en.m.wikipedia.org/wiki/Radiative_cooling https://en.m.wikipedia.org/wiki/Radiative_cooling More details a

The physical mechanism is radiative cooling: https://en.m.wikipedia.org/wiki/Radiative_cooling https://en.m.wikipedia.org/wiki/Radiative_cooling More details about the specific mechanism on the Parker Solar Probe’s cooling system: https://blogs.nasa.gov/parkersolarprobe/2018/09/14/parker-solar-probes-solar-array-cooling-system-fully-activated/ https://blogs.nasa.gov/parkersolarprobe/2018/09/14/parker-so...