THE NEW SPACE RACE: China tests a Stirling engine in orbit. “Similar to how hydroelectric dams generate power, a Stirling unit converts heat into electrical energy through a series of piston-driven magnets. These pistons rely on a fuel source to generate heat, pushing the magnets back and forth through a coil of wire, generating electrical current. This process is known as the Stirling cycle, which is more efficient than solar-powered systems and conventional batteries. Compared to other power systems, it is also lightweight, has a simple structure, a quick start-up cycle, and produces minor vibrations and low noise.”