Power in space · Generation, transmission, storage, use · Government and first-party sources
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Image of the Day · 2026-08-12

Half-Life Heartbeat

Half-Life Heartbeat: the probe's decay heat rings outward like a cardiogram pulse into the Kuiper-belt dark, a tiny warm heart in an enormous cold

Artistic imagining, not real hardware: a tiny dark space probe with a glowing ember-orange radioisotope generator sits low left in a vast near-black starfield, ringed by concentric dashed pulses of warm light that fade and cool as they spread outward, faint icy rocks rim-lit by the glow, and the distant Sun reduced to one bright star at upper right.
An artistic imagining, not existing hardware: alone in the Kuiper belt, where sunlight is too weak to matter and the Sun is just the brightest star, a small probe stays alive on the steady warmth of its radioisotope power source. Its heat rings outward like a heartbeat, and every pulse keeps exactly half the marks of the one before (94, then 47, then 24, down to a single dash) until the beat fades into the starfield. The nearest ice rocks catch the last of the glow; the dark takes the rest.
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