NASA
The National Aeronautics and Space Administration is an
independent agency of the
United States Federal Government responsible for the civilian space program, as well as
aeronautics and
aerospace research.
NASA was established in 1958, succeeding the
National Advisory Committee for Aeronautics (NACA). The new agency was to have a distinctly civilian orientation, encouraging peaceful applications in
space science. Since its establishment, most US
space exploration efforts have been led by NASA, including the Apollo
Moon landing missions, the Skylab space station, and later the Space Shuttle. NASA is supporting the International Space Station and is overseeing the development of the
Orion Multi-Purpose Crew Vehicle, the
Space Launch System and
Commercial Crew vehicles. The agency is also responsible for the
Launch Services Program which provides oversight of launch operations and countdown management for unmanned NASA launches.
NASA science is focused on better understanding Earth through the
Earth Observing System; advancing
heliophysics through the efforts of the
Science Mission Directorate's Heliophysics Research Program; exploring bodies throughout the
Solar System with advanced
robotic spacecraft missions such as
New Horizons; and researching
astrophysics topics, such as the
Big Bang, through the
Great Observatories and associated programs.
Creation
From 1946, the National Advisory Committee for Aeronautics (NACA) had been experimenting with rocket planes such as the supersonic
Bell X-1. In the early 1950s, there was challenge to launch an artificial satellite for the
International Geophysical Year (1957–58). An effort for this was the American
Project Vanguard. After the
Soviet launch of the world's first artificial
satellite (
Sputnik 1) on October 4, 1957, the attention of the United States turned toward its own fledgling space efforts. The
US Congress, alarmed by the perceived threat to national security and technological leadership (known as the "
Sputnik crisis"), urged immediate and swift action; President
Dwight D. Eisenhower and his advisers counseled more deliberate measures. On January 12, 1958, NACA organized a "Special Committee on Space Technology", headed by
Guyford Stever. On January 14, 1958, NACA Director
Hugh Dryden published "A National Research Program for Space Technology" stating:
While this new federal agency would conduct all non-military space activity, the
Advanced Research Projects Agency (ARPA) was created in February 1958 to develop space technology for military application.
On July 29, 1958, Eisenhower signed the National Aeronautics and Space Act, establishing NASA. When it began operations on October 1, 1958, NASA absorbed the 43-year-old NACA intact; its 8,000 employees, an annual budget of US$100 million, three major research laboratories (
Langley Aeronautical Laboratory,
Ames Aeronautical Laboratory, and
Lewis Flight Propulsion Laboratory) and two small test facilities. A NASA seal was approved by President Eisenhower in 1959. Elements of the
Army Ballistic Missile Agency and the
United States Naval Research Laboratory were incorporated into NASA. A significant contributor to NASA's entry into the
Space Race with the Soviet Union was the technology from the
German rocket program led by
Wernher von Braun, who was now working for the Army Ballistic Missile Agency (ABMA), which in turn incorporated the technology of American scientist
Robert Goddard's earlier works. Earlier research efforts within the
US Air Force and many of ARPA's early space programs were also transferred to NASA. In December 1958, NASA gained control of the
Jet Propulsion Laboratory, a contractor facility operated by the
California Institute of Technology.
Unmanned programs
More than 1,000 unmanned missions have been designed to explore the Earth and the solar system. Besides exploration, communication satellites have also been launched by NASA. The missions have been launched directly from Earth or from orbiting space shuttles, which could either deploy the satellite itself, or with a rocket stage to take it farther.
The first US unmanned satellite was
Explorer 1, which started as an ABMA/JPL project during the early part of the Space Race. It was launched in January 1958, two months after Sputnik. At the creation of NASA, the Explorer project was transferred to the agency and still continues to this day. Its missions have been focusing on the Earth and the Sun, measuring magnetic fields and the solar wind, among other aspects. A more recent Earth mission, not related to the Explorer program, was the Hubble Space Telescope, which was brought into orbit in 1990.
The inner Solar System has been made the goal of at least four unmanned programs. The first was Mariner in the 1960s and 1970s, which made multiple visits to Venus and Mars and one to Mercury. Probes launched under the Mariner program were also the first to make a planetary flyby (Mariner 2), to take the first pictures from another planet (Mariner 4), the first planetary orbiter (Mariner 9), and the first to make a gravity assist maneuver (Mariner 10). This is a technique where the satellite takes advantage of the gravity and velocity of planets to reach its destination.
The first successful landing on Mars was made by Viking 1 in 1976. Twenty years later a rover was landed on Mars by Mars Pathfinder.
Outside Mars, Jupiter was first visited by Pioneer 10 in 1973. More than 20 years later Galileo sent a probe into the planet's atmosphere, and became the first spacecraft to orbit the planet. Pioneer 11 became the first spacecraft to visit Saturn in 1979, with Voyager 2 making the first (and so far only) visits to Uranus and Neptune in 1986 and 1989, respectively. The first spacecraft to leave the solar system was Pioneer 10 in 1983. For a time it was the most distant spacecraft, but it has since been surpassed by both Voyager 1 and Voyager 2.
Pioneers 10 and 11 and both Voyager probes carry messages from the Earth to extraterrestrial life. Communication can be difficult with deep space travel. For instance, it took about three hours for a radio signal to reach the New Horizons spacecraft when it was more than halfway to Pluto. Contact with Pioneer 10 was lost in 2003. Both Voyager probes continue to operate as they explore the outer boundary between the Solar System and interstellar space.
On November 26, 2011, NASA's Mars Science Laboratory mission was successfully launched for Mars. Curiosity successfully landed on Mars on August 6, 2012, and subsequently began its search for evidence of past or present life on Mars.