Deuterium
Deuterium is a stable isotope of hydrogen with one proton and one neutron in its nucleus. It is commonly used as a fuel in nuclear fusion reactions due to its abundance and ability to produce high-energy neutrons. In space and astronautical engineering, deuterium is a key component in the development of fusion propulsion systems, which have the potential to provide a highly efficient and powerful means of space travel. Deuterium is also used in the production of heavy water, which is used as a moderator in nuclear reactors. Additionally, deuterium is a valuable tool for studying the origins and evolution of the universe, as it is believed to have played a role in the formation of the first stars and galaxies.
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