Instead of relying on the expansion of high-pressure steam, the Stirling engine is a closed system with a working gas, usually air, that generates power by having one part of the engine cycle ...

This engine won't be fueling interstellar missions, but still finds an unexpected way to use deep space energy to generate power. Reading time 3 minutes Deep space may provide hidden sources of energy ...

A modified regional airliner has carried a megawatt-class hybrid-electric propulsion system above 30,000 feet, crossing a ...