ELI5: Explain Like I'm 5

Stirling engine

A Stirling engine is a special kind of motor. It uses heat to make the motor run. Heat makes the motor's parts move, and when they move the engine runs! The heat makes part of the engine move back and forth, like a push and pull. This pushes and pulls against a wheel or fan blades to make the engine run. The heat might come from burning something like wood or coal, or it could come from the sun.