- This article is about the NASA Space Shuttle program. For the shuttle itself, see Space Shuttle. For information on the Soviet space shuttle, see the article Shuttle Buran.
NASA's Space Shuttle, officially called Space Transportation System (STS), is the United States government's current manned launch vehicle. The winged shuttle orbiter is launched vertically, usually carrying five to seven astronauts (although eight have been carried) and up to 50,000 lb (22,700 kg) of payload into low earth orbit. When its mission is complete, it fires its maneuvering thrusters to drop out of orbit and re-enters the earth's atmosphere. During the descent and landing, the shuttle orbiter acts as a glider and makes a completely unpowered landing.
The Shuttle is the first orbital spacecraft designed for partial reusability. It is also so far the only winged manned spacecraft to achieve orbit and land. It carries large payloads to various orbits, provides crew rotation for the International Space Station (ISS), and performs servicing missions. The orbiter can also recover satellites and other payloads from orbit and return them to Earth, but this capacity has not been used often. However, it has been used to return large payloads from the ISS to earth, as the Russian Soyuz spacecraft has limited capacity for return payloads. Each Shuttle was designed for a projected lifespan of 100 launches or 10 years' operational life.
The program started in the late 1960s and has dominated NASA's manned operations since the mid-1970s. According to the Vision for Space Exploration, use of the Space Shuttle will be focused on completing assembly of the ISS in 2010 (more specifically, the construction completion of the ISS), after which it will be replaced by the Crew Exploration Vehicle (CEV).
Even before the Apollo moon landing in 1969, in October 1968 NASA began early studies of space shuttle designs. The early studies were denoted "Phase A", and in June 1970, "Phase B", which were more detailed and specific.
In 1969 President Richard Nixon formed the Space Task Group, chaired by vice president Spiro T. Agnew. They evaluated the shuttle studies to date, and recommended a national space strategy including building a space shuttle.
In October 1969, at a Space Shuttle symposium held in Washington, George Mueller (NASA deputy administrator) presented opening remarks:  "The goal we have set for ourselves is the reduction of the present costs of operating in space from the current figure of $1,000 a pound for a payload delivered in orbit by the Saturn V, down to a level of somewhere between $20 and $50 a pound. By so doing we can open up a whole new era of space exploration. Therefore, the challenge before this symposium and before all of us in the Air Force and NASA in the weeks and months ahead is to be sure that we can implement a system that is capable of doing just that. Let me outline three areas which, in my view, are critical to the achievement of these objectives.
- One is the development of an engine that will provide sufficient specific impulse, with adequate margin to propel its own weight and the desired payload.
- A second technical problem is the development of the reentry heat shield, so that we can reuse that heat shield time after time with minimal refurbishment and testing.
- The third general critical development area is a checkout and control system which provides autonomous operation by the crew without major support from the ground and which will allow low cost of maintenance and repair.
Of the three, the latter may be a greater challenge than the first two."
The 1972 NASA/GAO REPORT TO THE CONGRESS, Cost-Benefit Analysis Used In Support Of The Space Shuttle Program states: NASA has proposed that a space shuttle be developed for U.S. Space Transportation needs for NASA, the Department of Defense (DOD), and other users in the 1980's.The primary objective of the Space Shuttle Program is to provide a new space transportation capability that will:
- (1) reduce substantially the cost of space operations and
- (2) provide a future capability designed to support a wide range of scientific, defense, and commercial uses.
During early shuttle development there was great debate about the optimal shuttle design that best balanced capability, development cost and operating cost. Ultimately the current design was chosen, using a reusable winged orbiter, solid rocket boosters, and expendable external tank.
The Shuttle program was formally launched on January 5, 1972, when President Nixon announced that NASA would proceed with the development of a reusable Space Shuttle system. The final design was less costly to build and less technically ambitious than earlier fully reusable designs.
The prime contractor for the program was North American Aviation (later Rockwell International), the same company responsible for the Apollo Command/Service Module. The contractor for the Space Shuttle Solid Rocket Boosters was Morton Thiokol (now part of Alliant Techsystems), for the external tank, Martin Marietta (now Lockheed Martin), and for the Space shuttle main engines, Rocketdyne.
The first complete orbiter was originally named Constitution, but a massive write-in campaign from fans of the Star Trek television series convinced the White House to change the name to Enterprise. Amid great fanfare, the Enterprise was rolled out on September 17, 1976, and later conducted a successful series of glide-approach and landing tests that were the first real validation of the design.
The first fully functional Shuttle Orbiter was the Columbia, built in Palmdale, California. It was delivered to Kennedy Space Center on March 25, 1979, and was first launched on April 12, 1981—the 20th anniversary of Yuri Gagarin's space flight—with a crew of two. Challenger was delivered to KSC in July 1982, Discovery in November 1983, and Atlantis in April 1985. Challenger was destroyed when it disintegrated during ascent due to O-Ring failure on the right SRB on January 28, 1986, with the loss of all seven astronauts on board. Endeavour was built to replace Challenger (using spare parts originally intended for the other Orbiters) and delivered in May 1991; it was first launched a year later. Seventeen years after Challenger, Columbia was lost, with all seven crew members, during reentry on February 1, 2003, and has not been replaced. Out of five functional shuttle orbiters only three remain for use.
Individual Orbiters are both named, in a manner similar to ships, and numbered, using the NASA Orbiter Vehicle Designation system. While all Orbiters are externally very similar, they have minor internal differences; new equipment is fitted on a rotating basis as they are maintained, and the newer Orbiters tend to be structurally lighter.
||Pathfinder||Orbiter Simulator for moving and handling tests|
||N/A||Testbed for propulsion and fuel delivery systems|
||N/A||Structural test article used for stress and thermal testing, later became Challenger|
||Challenger||Destroyed after liftoff - January 28, 1986|
||Enterprise||Used for approach and landing tests, not suitable for spaceflight|
||Columbia||Destroyed during reentry February 1, 2003|
||Discovery||First launched on August 30, 1984|
||Atlantis||First launched on October 3, 1985|
||Endeavour||First launched on May 7, 1992|
In addition to the test articles and Orbiters produced for use in the Shuttle program, there are also various mockups on display throughout the world:
- Space Shuttle Explorer, a full scale replica of an Orbiter at the Kennedy Space Center visitor's complex
- Space Shuttle Adventure, a full scale mockup of an Orbiter mid-deck and flight deck at Space Center Houston
Current and past Space Shuttle's applications include:
- Crew rotation and servicing of Mir and the ISS
- Manned servicing missions, such as to the Hubble Space Telescope (HST)
- Manned experiments in LEO
- Carry to LEO:
- Large satellites — these have included the HST
- Components for the construction of the ISS
- Carry satellites with a booster, the Payload Assist Module (PAM-D) or the Inertial Upper Stage (IUS), to the point where the booster sends the satellite to:
- A higher Earth orbit; these have included:
- An interplanetary orbit; these have included:
|Flight days||Longest flight||First flight||Last flight|
|Enterprise||5||00d 00h 19m||00d 00h 05m||ALT-12||Aug 12, 1977||ALT-16||Oct 26, 1977|
|Shuttle||Flights||Flight days||Orbits||Longest flight||First flight||Last flight||Mir/ISS
|Columbia †||28||300d 17h 47m 15s||4,808||17d 15h 53m 18s||STS-1||Apr 12, 1981||STS-107 †||Jan 16, 2003||0 / 0|
|Challenger †||10||62d 07h 56m 15s||995||08d 05h 23m 33s||STS-6||Apr 04, 1983||STS-51-L †||Jan 28, 1986||0 / 0|
|Discovery||39||364d 22h 39m 29s||5,830||15d 02h 48m 08s||STS-41-D||Aug 30, 1984||STS-133||Feb 24, 2011||1 / 13|
|Atlantis||33||306d 14h 12m 43s||4,848||13d 20h 12m 44s||STS-51-J||Oct 03, 1985||STS-135||July 8, 2011||7 / 12|
|Endeavour||25||296d 03h 34m 02s||4,677||16d 15h 08m 48s||STS-49||May 07, 1992||STS-134||May 16, 2011||1 / 12|
|Total||135||1330d 18h 9m 44s||21,158||9 / 37|
As of 2006, two Shuttles have been destroyed in 115 missions, both with the loss of the entire crew (14 astronauts total):
- Challenger — lost 73 seconds after liftoff, January 28, 1986
- Columbia — lost approximately 16 minutes before landing, February 1, 2003
This gives a 2% death rate per astronaut per flight, and a failure rate of almost 1 every 60 missions.
Since the Space Shuttle Columbia disaster in 2003, the ISS had been operating on a skeleton crew of two and is currently being serviced primarily by Russian space vehicles. While the "return to flight" mission STS-114 in 2005 was successful, a similar piece of foam from a different portion of the tank was shed. Although the debris did not strike the Orbiter, the program was grounded once again.
The second "Return to Flight" mission, STS-121, launched on July 4, 2006, at 2:37:55 PM (EDT), after two previous launches were scrubbed because of lingering thunderstorms and high winds around the launch pad and the launch took place despite objections from its chief engineer and safety head. This mission increased the ISS crew to three. A five-inch crack in the foam insulation of the external tank gave cause for concern; however, the Mission Management Team gave the go for launch.  Space Shuttle Discovery touched down successfully on July 17, 2006 at 9:14:43 AM (EDT) on Runway 15 at the Kennedy Space Center.
Following the success of STS-121, the next mission, STS-115, is scheduled for launch on August 28, 2006, following a 24-hour delay due to severe weather in the vicinity of Kennedy, including a lightning strike at the launch pad where the shuttle was undergoing launch preparations.
The Shuttle program is scheduled for mandatory retirement in 2010. The Shuttle's planned succesor is Project Constellation with its Ares I and Ares V launch vehicles and Crew Exploration Vehicle. NASA hopes to launch 16 more shuttle flights before then. 
The total cost of the Shuttle program has been $145 billion as of early 2005 , and is estimated to be $174 billion when the Shuttle retires in 2010. NASA's budget for 2005 allocated 30%, or $5 billion, to Space Shuttle operations;  this was decreased in 2006 to a request of $4.3 billion. 
Per-launch costs can be measured by dividing the total cost over the life of the program (including buildings, facilities, training, salaries, etc) by the number of launches. With 115 missions (as of 6 August 2006), and a total cost of $150 billion ($145 billion as of early 2005 + $5 billion for 2005 , this gives approximately $1.3 billion per launch. Another method is to calculate the incremental (or marginal) cost differential to add or subtract one flight — just the immediate resources expended/saved/involved in that one flight. This is about $60 million .
Early cost estimates of $118 per pound ($260/kg) of payload were based on marginal or incremental launch costs, and based on 1972 dollars and assuming a 65,000 pound (30,000 kg) payload capacity.  Correcting for inflation, this equates to roughly $36 million incremental per launch costs. Compared to this, today's actual incremental per launch costs are about 50% more, or $60 million per launch.
The Space Shuttle program has been criticized for failing to achieve its promised cost and utility goals, as well as design, cost, management, and safety issues.
After both the Challenger disaster and the Columbia disaster, high profile boards convened to investigate the accidents with both committees returning praise and serious critiques to the program and NASA management. One of the most famous of these criticisms came from Nobel Prize winner Richard Feynman.
Terrestrial transportation vehicles
- The Crawler-Transporter carries the Mobile Launcher Platform and the Space Shuttle from the Vehicle Assembly Building to Launch Complex 39.
- The Shuttle Carrier Aircraft are two modified Boeing 747s. Either can fly an Orbiter from alternative landing sites back to Cape Canaveral.
- A 36-wheeled transport trailer, originally built for the U.S. Air Force's launch facility at Vandenberg Air Force Base in California (since then converted for Delta IV rockets) that would transport the Orbiter from the landing facility to the launch pad, which allowed both "stacking" and launch without utilizing a separate VAB-style building and crawler-transporter roadway. Prior to the closing of the Vandenberg facility, Orbiters were transported from the OPF to the VAB on its undercarriage, only to be raised when the Orbiter was being lifted for attachment to the SRB/ET stack. The trailer allows the transportation of the Orbiter from the OPF to either the SCA-747 "Mate-Demate" stand or the VAB without placing any additional stress on the undercarriage.
- GRiD Compass the early laptop carried aboard the shuttle.
- Human spaceflight
- List of human spaceflights
- List of human spaceflights chronologically
- List of space shuttle missions
- NASA Space Shuttle decision
- Shuttle Derived Launch Vehicle
- Shuttle SERV
- Space disaster
- Space exploration
- Space Shuttle abort modes
- Space Shuttle crews
- Space shuttles in fiction
- 'Shuttle' Game DOS-based shuttle simulator from the 1990s.
- Orbiter a freeware simulator that allows users to fly various spacecraft including the Shuttle.
- EADS Phoenix
- Military space shuttle
- Project Constellation
- Shuttle Buran program
- Heppenheimer, T.A. The Space Shuttle Decision: NASA's Search for a Reuseble Space Vehicle. Washington, DC: National Aeronautics and Space Administration, 1999.
- Brooks, Dawn The Names of the Space Shuttle Orbiters. Washington, DC: National Aeronautics and Space Administration. Accessed July 26, 2006.
- Chien, Philip (June 27, 2006) "NASA wants shuttle to fly despite safety misgivings." The Washington Times
- National Aeronautics and Space Administration. "NASA Names New Rockets, Saluting the Future, Honoring the Past" Press Release 06-270. 30 June 2006.
- David, Leonard (11 February 2005). "Total Tally of Shuttle Fleet Costs Exceed Initial Estimates". Space.com. Retrieved 2006-08-06. Check date values in:
- Berger, Brian (7 February 2006). "NASA 2006 Budget Presented: Hubble, Nuclear Initiative Suffer". Space.com. Retrieved 2006-08-06. Check date values in:
- Reference manual
- NASA Space Shuttle News Reference - 1981 (PDF document)
- Orbiter Vehicles
- Shuttle Program Funding 1992 - 2002
- Shuttle development costs and history, CAIB transcript 4-23-03
- R.A.Pielke, "Space Shuttle Value open to Interpretation", Aviation Week Magazine, issue 26. July 1993, p.57 (PDF file): 
|Wikimedia Commons has media related to Space Shuttle.|
- MSNBC.com, Jan. 27, 2006: "7 myths about the Challenger shuttle disaster": On the 20th anniversary of the Space Shuttle Challenger disaster, NBC's space analyst James Oberg debunks seven myths that have grown up around the event.
- NASA Human Spaceflight - Shuttle: Current status of Shuttle missions
- NASA TV: View live streaming of launch and mission coverage
- Space Shuttle Newsgroup - sci.space.shuttle
- List of all Shuttle Landing Sites
- Map of Landing Sites
- Congressional Research Service (CRS) Reports regarding the Space Shuttle
- Washington Monthly: "Beam Me Out Of This Death Trap, Scotty": Critical article on the Space Shuttle program, from 1981
- The Atlantic Monthly, November 2003: "Columbia's Last Flight" Article on the Columbia disaster and the subsequent investigation
- SpaceDaily.com: "Explaining 30 years of Fudge": How the shuttle program was mis-sold to congress and where the $118/lb supposed costs came from
- NASA wants shuttle to fly despite safety misgivings - June 27, 2006
- Weather criteria for Shuttle launch