photon engine also known as photon rocket engine (photon rocket engine) is a rocket engine that relies on the directional flow of electromagnetic radiation quantum (photon) to generate thrust.
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In theory, this engine has the highest efficiency and specific impulse, and its main structural component is the photon source. In order to obtain a large enough light pressure in the photon source, a high temperature of 50,000-250000K is required. The engine is still at the theoretical stage of exploration.