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

Handing the Heat Back

Io gives the heat away; the machine's only work is handing back what it could not use.

An artistic imagining, not real hardware. A flat-plane poster in which every edge runs at a multiple of 30 degrees, on a dark, near-black field. At the lower left a caldera is cut into brown terraced ground and filled with a molten lake drawn as nested angular terraces stepping from deep red through orange to a white-gold centre; thin orange fissures still glow in the plain around it. A column of fire rises from the lake and spreads into a stack of six flat umbrella caps that cool upward from pale gold through orange to dark maroon. A black duct runs down the slope from the right and ends in a black intake hood whose wide lower lip stands in the melt; a plain cream arrow lies along the duct pointing up the slope. The duct climbs to a black machine hall that stands on two unequal piers and one diagonal brace on the caldera rim, hard-cut against a huge flat block of signal red that fills the right third of the picture. The hall carries two unequal cream window strips, one flat cobalt-blue panel, and a stack with a lopsided cream cap. From the hall a flat cobalt bar with a cream arrow on it runs off the right edge of the frame. A black boom carries a large radiator wing up and to the right on the picture's one rising diagonal: a bank of eleven slanted slats, divided by thin black lines, cooling along the wing's length from signal red at the manifold through maroon and plum to blue-black at the tip, with three plain cream arrows leaving its face square to the panel. In the upper left a huge banded body cropped by the top and left edges is drawn as flat horizontal stripes of maroon and rose, its lower-right limb faceted into straight segments and lit with a bright cream-gold rim. Two hairline cream rules are ruled straight across the whole field on the same rising diagonal, one of them crossing the banded body. No text, lettering, insignia or figures appear anywhere.
An artistic imagining of a thermal power station tapping a lava lake on Io, drawn in the plain-spoken poster language of Lester Beall: flat blocks of colour, rules ruled clean across the field, and small arrows used only to point at the machine. Io really is the most volcanically active body known, shedding on the order of a hundred trillion watts of tidal heat, and in vacuum the only way to be rid of waste heat is to radiate it - which is why the wing handing that heat back to the sky is the largest single object in the picture. Image: poweringspace.com. Artistic imagining.
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