Neuron, A cell that carries messages in the nervous system., Magnet, An object that attracts iron and certain metals., Galaxy, A huge system of stars, gas, and dust in space., Battery, A device that stores and provides electrical energy., Satellite, An object that orbits a planet., Laser, A device that produces a very focused beam of light., Turbine, A machine that converts moving fluid into energy., Sensor, A device that detects changes in the environment., Radar, A system that uses radio waves to detect objects., Fusion, The process where small atomic nuclei combine to form a larger one..

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