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In page Spacecraft propulsion:

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Ion propulsion rockets can heat a plasma or charged gas inside a magnetic bottle and release it via a magnetic nozzle so that no solid matter needs to come in contact with the plasma.[citation needed] The machinery to do this is complex, but research into nuclear fusion has developed methods, some of which have been proposed to be used in propulsion systems, and some have been tested in a lab.[citation needed] (See the Wikipedia article on rocket engines for a listing of various kinds of rocket engines using different heating methods, including chemical, electrical, solar, and nuclear.)