Power in space · Generation, transmission, storage, use · Government and first-party sources
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Image of the Day · 2026-06-02

Only the Sky Is Cold

At lunar noon the ground is a furnace, so the radiators turn their edges to the Sun and their faces to the only cold thing left: the sky.

An artistic imagining, not real hardware. A pale rose lunar plain stretches to a hard horizontal horizon under a dark plum sky, with a small half-lit moon hanging at upper left. Across the middle distance stands a long rank of tall rectangular radiator blades, all canted so their thin edges face the overhead Sun. Their translucent faces cool from pale pink at the base toward shadow at the top, and patterned lower panels connect to a vivid magenta header. At right, a squat cylindrical shielded reactor feeds the header through a pump house and hot pipe; a segmented pale return line curves across the foreground. The blades overlap and diminish into the distance, casting narrow shadows across a ruled ground shield.
An artistic imagining, not existing hardware: a heat-dump field at lunar noon turns its radiator edges toward the Sun and its broad faces toward the only cold sink left, the black sky. Real spacecraft radiators use optical solar reflector surfaces for the same reason: reject infrared while reflecting incident sunlight. Image: poweringspace.com. Artistic imagining.
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