High Quality Content by WIKIPEDIA articles! NASA Headquarters, in Washington D.C., provides overall guidance and direction to the NASA agency, under the leadership of the NASA Administrator. Ten field centers and a variety of installations around the country conduct the day-to-day work. To implement NASA's mission, NASA Headquarters is organized into four Mission Directorates. Aeronautics: Pioneers and proves new flight technologies that improve our ability to explore and which have practical applications on Earth. Exploration Systems: Creates new capabilities and spacecraft for affordable, sustainable human and robotic exploration Science: Explores the Earth, moon, Mars, and beyond; charts the best route of discovery; and reaps the benefits of Earth and space exploration for society. Space Operations: Provides critical enabling technologies for much of the rest of NASA through the space shuttle, the International Space Station, and flight support.