Power in space · Generation, transmission, storage, use · Government and first-party sources
poweringspace
Image of the Day · 2026-07-02

The Cable That Was Already There

The cable was already there; the machine only has to stand in the current.

An artistic imagining, not real hardware. A grainy silver black-and-white photograph, almost without colour, printed as one magazine spread: a vertical fold runs down the frame at just under half its width, the fold's shadow and lit paper edge visible, and everything to the right of the fold sits slightly lower and slightly darker, as if the spread were bound out of register. A dim mottled moon fills the upper left corner and is cropped by the edge of the page. A brilliant column of current stands on the moon's sunlit ground, pooling light around its base, and sweeps in a shallow arc down the diagonal to a vast banded planet that fills the lower right. Three ring gantries of the same design are clamped around the column, growing larger down its length: a small one at the moon with two legs braced to the ground, one at mid span, and a large one near the planet, each a foreshortened truss ring with a collar hugging the column, a canted radiator wing on one side and an instrument module on a boom. Where the column reaches the cloud tops it spreads into a bright oval pool of aurora, and a chain of smaller, fainter auroral spots trails away from it along the limb toward the lower left, fading in unequal steps. Inside the pool a long dark vessel is silhouetted edge on, four canted collector panels along its hull and a raised intake ring at its leading end, moored to the foot of the column by a single line. The lower left third of the frame is empty black sky with a scatter of faint stars. No text or lettering appears anywhere.
An artistic imagining of the Io flux tube used as a transmission line, not a real or planned installation. Io's motion through Jupiter's rotating magnetic field really does drive a circuit of roughly 2 to 5 million amperes between the moon and the planet's ionosphere, lighting a compact auroral footprint and a trail of fading spots downstream, and here that ready-made conductor has simply been stood in: three ring gantries clamp around the current, and a floating raft takes delivery in the pool of light where the column meets the cloud tops. Image: poweringspace.com. Artistic imagining.
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