Creation
Beginning in 1946, the National Advisory Committee for Aeronautics (NACA) began experimenting with rocket planes such as the supersonic Bell X-1. In the early 1950s, there was challenge to

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The agency's leader, NASA's administrator, is nominated by the President of the United States subject to the approval of the US Senate, and reports to him or her and serves as a senior space science advisor. Though space exploration is ostensibly non-partisan, the

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NASA Headquartersin Washington, DC provides overall guidance and political leadership to the agency's ten field centers, through which all other facilities are administered. Four of these were inherited from NACA; two others were transferred from the Army;

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In 1994, there was a Congressional directive to find near-Earth objects (NEOs) larger than 1 kilometer, and 90% of 1 kilometer sized asteroids are estimated to have been found by 2010.
In 1999, NASA visited 433 Eros with the NEAR spacecraft which

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NASA's Aeronautics Research Mission Directorate conducts aeronautics research.
NASA has made use of technologies such as the multi-mission radioisotope thermoelectric generator (MMRTG), which is a type of radioisotope thermoelectric generatorused

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The exhaust gases produced by rocket propulsion systems, both in Earth's atmosphere and in space, can adversely effect the Earth's environment. Some hypergolic rocket propellants, such as hydrazine, are highly toxic prior to combustion,

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NASA has conducted many uncrewed and robotic spaceflight programs throughout its history. Uncrewed robotic programs launched the first American artificial satellites into Earth orbit for scientific and communicationspurposes, and sent scientific probes to

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