Difference between revisions of "National Aeronautics and Space Administration"

Revision as of 20:37, May 31, 2008

Apollo 11 launch. The small cloud midway up the rocket is due to the Low Pressure in that region as the Rocket Passes through Max Q, the maximum dynamic pressure exerted on the rocket in the launch.

The National Aeronautics and Space Administration (NASA) began in 1958. It was created by U.S. legislation for the purpose of creating a government space program for the United States. This legislation was in response to the Soviet Union's the first man-made satellite, Sputnik I. According to the act NASA was to conduct research on the problems of flight in and out of the atmosphere, with and without human pilots, and to cooperate with other nations in the peaceful exploration of space. NASA is responsible for many satellites including Landsat, which was a series of satellites for the collection of information on natural resources, communication satellites and weather satellites. The Project Apollo program under NASA led to several landings on the Moon from 1969-1972. It is also the designer and developer of the space shuttle.

NASA Manned Missions

• Project Mercury Initiated in 1958 and completed in 1963, Project Mercury was the United States' first man-in-space program. The objectives of the program, which made six manned flights from 1961 to 1963, were specific: orbit a manned spacecraft around Earth, investigate man's ability to function in space and recover both man and spacecraft safely. ^[1]

• Project Gemini The Gemini Program was a necessary intermediate step between Project Mercury and the Apollo Program and had four objectives: subject astronauts to long duration flights- a requirement for projected later trips to the moon or deeper space; develop effective methods of rendezvous and docking with other orbiting vehicles, and to maneuver the docked vehicles in space; perfect methods of reentry and landing the spacecraft at a pre-selected land-landing point; gain additional information concerning the effects of weightlessness on crew members and to record the physiological reactions of crew members during long duration flights. ^[2]

• Project Apollo On May 25, 1961, President John F. Kennedy announced the goal of sending astronauts to the moon before the end of the decade. Coming just three weeks after Mercury astronaut Alan Shepard became the first American in space, Kennedy's bold challenge set the nation on a journey unlike any before in human history.

Eight years of hard work by thousands of Americans came to fruition on July 20, 1969, when Apollo 11 commander Neil Armstrong stepped out of the lunar module and took "one small step" in the Sea of Tranquility, calling it "a giant leap for mankind."

Six of the missions -- Apollos 11, 12, 14, 15, 16 and 17 -- went on to land on the moon, studying soil mechanics, meteoroids, seismic, heat flow, lunar ranging, magnetic fields and solar wind. Apollos 7 and 9 tested spacecraft in Earth orbit; Apollo 10 orbited the moon as the dress rehearsal for the first landing. An oxygen tank explosion forced Apollo 13 to scrub its landing, but the "can-do" problem solving of the crew and mission control turned the mission into a "successful failure."

The program also drew inspiration from Apollo 1 astronauts Gus Grissom, Ed White and Roger Chaffee, who lost their lives in a fire during a launch pad test in 1967.

Project Apollo concluded with the Apollo/ Soyuz mission during July1975, part of a series of cooperative space flights between the United States and the Soviet Union (Russia) that continues today. The docking in space of the two spacecraft took place at 2:17 p.m. U.S. Central Daylight Time on 17 July. Two days of joint operations followed. After separation, the Soyuz remained in space for almost two days before landing in the USSR on 21 July. The Apollo spacecraft remained in space for another three days before splashing down near Hawaii on 24 July. The mission was a resounding success for both Americans and Soviets. They achieved their goal of obtaining flight experience for rendezvous and docking of human spacecraft. In addition, they also demonstrated in-flight intervehicular crew transfer, as well as accomplished a series of scientific experiments. ^{[3] [4]}

• Skylab was America's first space station and orbital science and engineering laboratory. Skylab was launched into Earth orbit by a Saturn V rocket on May 14, 1973 as part of the Apollo program. Three crews visited the station, with their missions lasting 28, 59 and 84 days. The mission crews performed a plethora of UV astronomy experiments, eight separate solar experiments and detailed X-ray studies of the Sun. ^[5]

• The Space Shuttle is the world's first reusable spacecraft, and the first spacecraft in history that can carry large satellites both to and from orbit. The Shuttle launches like a rocket, maneuvers in Earth orbit like a spacecraft and lands like an airplane. Each of the three Space Shuttle orbiters now in operation -- Discovery, Atlantis and Endeavour -- is designed to fly at least 100 missions. So far, altogether they have flown a combined total of less than one-fourth of that.

Columbia was the first Space Shuttle orbiter to be delivered to NASA's Kennedy Space Center, Fla., in March 1979. Columbia and the STS-107 crew were lost Feb. 1, 2003, during re-entry. The Orbiter Challenger was delivered to KSC in July 1982 and was destroyed in an explosion during ascent in January 1986. Discovery was delivered in November 1983. Atlantis was delivered in April 1985. Endeavour was built as a replacement following the Challenger accident and was delivered to Florida in May 1991. An early Space Shuttle Orbiter, the Enterprise, never flew in space but was used for approach and landing tests at the Dryden Flight Research Center and several launch pad studies in the late 1970s.

The Shuttle has the most reliable launch record of any rocket now in operation. Since 1981, it has boosted more than 1.36 million kilograms (3 million pounds) of cargo into orbit. More than than 600 crew members have flown on its missions. Although it has been in operation for almost 20 years, the Shuttle has continually evolved and is significantly different today than when it first was launched. NASA has made literally thousands of major and minor modifications to the original design that have made it safer, more reliable and more capable today than ever before.

In 1992, the U.S. and the new Russian Federation renewed the 1987 space cooperation agreement and issued a "Joint Statement on Cooperation in Space." Subsequent additions to the agreement outline the development of the NASA-Mir program. From February 1994 to June 1998, space shuttles made 11 flights to the Russian space station Mir, and American astronauts spent seven residencies onboard Mir. Space shuttles also conducted crew exchanges and delivered supplies and equipment.^{[6] [7]}

• The International Space Station is a working laboratory orbiting 240 miles (390 kilometers) above the Earth and is home to an international crew. It is the most complex scientific and technological endeavor ever undertaken, involving five space agencies representing 16 nations. Once completed, this new research outpost in space will include contributions from the U.S., Canada, Japan, Russia, Brazil, Belgium, Denmark, France, Germany, Italy, the Netherlands, Norway, Spain, Sweden, Switzerland and the United Kingdom. As a research outpost, the station is a test bed for future technologies and a research laboratory for new, advanced industrial materials, communications technology, medical research and much more. On-orbit assembly began in 1998 with the launch of Zarya, and today the station provides crewmembers with 15,000 cubic feet of habitable volume – more room than a conventional three-bedroom house – and weighs 404,000 pounds.

The station now includes the Russian-built Zarya Module and the Zvezda Service Module, which contain the station’s living quarters and life-support systems; the U.S.-built Unity Connecting Module, providing docking ports for several station components; the U.S.-built Destiny Laboratory, which expands the station’s scientific capabilities with experiment compartments that allow nearly continuous scientific research and provide additional life support and robotic capabilities; the U.S.-built Quest Airlock, a doorway to space that supports station-based spacewalks; the Canadian-built Canadarm2, a new-generation robotic arm that gives the station a movable space crane; the Russian-built Pirs docking compartment, which adds additional spacewalking and docking capabilities to the station; and truss segments, which serve as the framework for additional station segments. Japanese and European research laboratories are ready for delivery to expand the station’s research capabilities even more. ^[8]

References