The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the civilian space program, as well as aeronautics and space research. NASA was established NASA is under presidential orders to land humans on Mars by 2033, and NASA-funded engineers are studying a way to build potential human habitats there by producing bricks from pressurized Martian soil. The European Space Agency has a long-term goal to send humans but has not yet built a crewed spacecraft NASA has made use of technologies such as the multi-mission radioisotope thermoelectric generator (MMRTG), which is a type of radioisotope thermoelectric generator used to power spacecraft.[170] Shortages of the required plutonium-238 have curtailed deep space missions since the turn of the millennium.[171] An example of a spacecraft that was not developed because of a shortage of this material was New Horizons 2.[171] The Earth science research program was c...
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