Nuclear fission reactor
A nuclear fission reactor was a power source common to 20th century Earth vehicles. As the name implies, it generates energy through the process of nuclear fission.

The , an aircraft carrier which was in service with the US Navy, was the first ship of that type to be equipped with such a nuclear reactor, MMR. In 1986, Commanders Pavel Chekov and Uhura transported aboard the Enterprise in search of high-energy photons from one of its eight nuclear fission reactors. They were needed to recrystallize the dilithium of the , a hijacked Klingon Bird-of-Prey taken to the past in order to bring a humpback whale into the future. Captain Montgomery Scott had designed a special device to retrieve the photons, which Chekov and Uhura attached directly to the reactor. ()

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Energy technology
Propulsion technology