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A nuclear thermal rocket (NTR) is a type of thermal rocket where the heat from a nuclear reaction replaces the chemical energy of the propellants in a chemical rocket. In an NTR, a working fluid, usually liquid hydrogen, is heated to a high temperature in a nuclear reactor and then expands through a rocket nozzle to create thrust.
A nuclear-free zone is an area in which nuclear weapons and nuclear power plants are banned. The specific ramifications of these depend on the locale in question, but are generally distinct from nuclear-weapon-free zones, in that the latter only bans nuclear weapons but may permit nuclear power.