Revolutionary new engine runs on the cold of space – no fuel required

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 entir…