Revolutionary new engine runs on the cold of space – no fuel required
Every night, the sky does something invisible and enormous. Heat escapes from Earth’s surface upward through the atmosphere and out into the cold of space. This is a process as old as the planet itself. However, no one had seriously tried to harness that nightly energy flow and turn it into usable mechanical power. A small team of engineers in California just did. Researchers at the University of California, Davis built an engine that runs entirely on the temperature difference between warm ground and a cold night sky, no fuel, no batteries, no grid connection required. It sits outside, faces upward, and quietly pulls power from the dark. The demonstration is modest in scale. Even so, the underlying principle opens a genuinely new category of off-grid energy technology. The Cold Side of the Energy Equation Solar panels capture sunlight by exploiting the fact that one side of a device is hotter than the other. The sun warms the active surface; the surroundings stay cool. Jeremy Munday, a professor of electrical and computer engineering at UC …
