A heat engine that produces power from the temperature difference between two parts, without using explosions like gasoline engines.
Named after Robert Stirling, a Scottish minister who invented the engine in 1816; the surname Stirling comes from a place in Scotland.
Stirling engines are eerily quiet because they don't combust fuel explosively—NASA considered them for Mars rovers, and some are still used in solar-powered equipment because they're incredibly efficient and reliable.
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