NASA has four mission directorates:
•Aeronautics: research to improve air transportation;
–Dates back to the 1930s as National Advisory Committee for Aeronautics
–International Space Station operations,
–development of commercial spaceflight capabilities, and
–human exploration of asteroids and Mars [being planned].
•Science: explore the Earth, solar system and universe beyond [NASA has sent probes to every planet and used space telescope];
•Space Technology: develop revolutionary, high-payoff technologies that enable NASA's future missions while providing economic benefit to the nation.