Also See:
NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA | NASA

Meanwhile the Air Force had a continuing interest in smaller systems with more rapid turn-around times, and were involved in their own spaceplane project called Dynasoar. In several instances groups from both worked together to investigate the state of the art.

Spacelab
Spacelab is a microgravity laboratory flown into space on the Space Shuttle. It consists of a large cylindrical main laboratory that is flown in the rear of the Space Shuttle cargo bay, connected to the crew compartment by a long tube. In April 1973 NASA and the ESA (then known as the ESRO) agreed to build a modular science package. Construction of Spacelab started in 1974 by the ERNO (represented by VFW-Fokker GmbH, later bought by MBB, and since 2003 part of EADS Space Transportation). The first lab, LM1, was given to NASA free of charge in exchange for flight opportunities for european astronauts. A second lab, LM2, was bought by NASA for its own needs. The system also included a system of external pallets for experiments in vacuum, built by

International Space Station
International Space Station Continuing on from the United States' Skylab and Russia's Mir, the International Space Station (ISS) represents a permanent human presence in space. The space station is located in orbit around the Earth at an altitude of approximately 386 km, a type of orbit usually termed low Earth orbit. (The actual height varies over time by several kilometres due to atmospheric drag and reboosts.) It orbits Earth at a period of about 92 minutes; on December 1, 2003 it had completed over 28,700 orbits since launch. It is serviced primarily by the Space Shuttle, and Soyuz and Progress spacecraft units. It is still being built, but is home to some experimentation already. At present, the station has a capacity for a crew of three, who

Shuttle development

The shuttle program was launched on January 5, 1972, when President Richard M. Nixon announced that NASA would proceed with the development of a reusable low cost space shuttle system.

The project was already to take longer than originally anticipated due to the year-to-year funding caps. Nevertheless work started quickly and several test articles were available within a few years.

Most notable among these was the first complete Orbiter, originally to be known as Constitution. However a massive write-in campaign on the part of fans of the TV show Star Trek convinced the White House to change the name to Enterprise. Enterprise was rolled out on September 17, 1976 and later conducted a very successful series of landing tests which was the first real validation of the gliding abilities of the design.

The first fully functional shuttle orbiter was the Columbia, which was delivered to Kennedy Space Center on March 25, 1979 and was first launched on April 12, 1981 with a crew of two. Challenger was delivered to KSC in July 1982, Discovery was delivered in November 1983, and Atlantis was delivered in April 1985. Challenger was destroyed in an explosion during launch in January 1986 with the loss of all seven astronauts on board, and Endeavour was built as a replacement (using spare parts originally built for the other orbiters) and delivered in May 1991. Columbia was lost, with all seven crew, in a re-entry mishap on February 1, 2003.

The Shuttle in retrospect

Whilst the shuttle has been a reasonably successful launch vehicle, it had been unable to meet its goals of radically reducing flight launch costs, as each flight costs on the order of $500 million rather than initial projections of $10 to $20 million.

Although the design is radically different than the original concept, the project was still supposed to meet the upgraded AF goals as well as be much cheaper to fly in general. What went wrong?

One issue appears to be inflation. During the 1970s the US suffered from the worst inflation in modern history, driving up costs about 200% by 1980. In contrast, the rate between 1990 and 2000 was only 34% in total. This has the effect of magnifying the development costs of the shuttle tremendously.

However this doesn't explain the high costs of the continued operations of the shuttle. Even accounting for inflation the launch costs on the original estimates should be about $100 million today. To explain this you have to look at the operational details of maintaining and servicing the shuttle fleet, which have turned out to be tremendously more expensive than anticipated.

When originally conceived the shuttle was to operate similar to an airliner. After landing the Orbiter would be checked out and start "mating" to the rest of the system (the ET and SRBs) and be ready for launch in as little as two weeks. Instead this turnaround process in fact takes months. This is due, in turn, to the continued "upgrading" of the inspection process as a result of hardware decisions made to reduce short-term development costs which resulted in higher maintenance requirements which where exacerbated by the fallout from the loss of Challenger. Even simple tasks now require unbelievable amounts of paperwork. This paperwork results from the fact that, unlike current expendable launch vehicles, the Space Shuttle is manned and has no escape systems to speak of and therefore any accident which would result in the loss of booster would also result in the loss of the crew which is, of course, unacceptable. Because loss of crew is unacceptable, the primary focus of the shuttle program is to return the crew to earth safely, which can conflict with other goals, namely to launch satellites cheaply. Furthermore, because there are cases where there are no abort modes, no potential way to prevent failure from becoming critical, many pieces of hardware simply must function perfectly and so must be carefully inspected before each flight.

The result is a massively inflated manpower bill. There are 25,000 workers in shuttle operations (perhaps an older number), so simply multiply any figure that you choose for an average annual salary, divide by six (or 4 or 7...launches per year), and there you have it.

The lessons of the shuttle have been seen as different depending on who you ask. In general, however, future designers look to systems with only one stage, automated checkout, and in some cases, overdesigned (more durable) low-tech systems.

Perhaps the most annoying aspect of the shuttle system is to consider the Air Force participation. While the blame rests solely at the feet of NASA for getting them involved in the first place, it was the Air Force requirements that drove the system to be as complex and expensive as it is today. Ironically neither NASA nor the Air Force got the system they wanted or needed, and the Air Force eventually threw in the towel and returned to their older launch systems and abandoned their Vandenburg shuttle launch plans. The capabilities which most seriously hobbled the Shuttle system, namely the 65,000 payload, large payload bay, and 1000 mile cross-range, have in fact, except for the payload bay, never been used.

Statistics

The Air Force relucantly agreed, but only after demanding a large increase in capability to allow for launching their projected spy satellites (mirrors are heavy). These were quite large, weighing an estimated 40,000 lbs, and needed to be put into polar orbit, which requires more energy to get to than the more common LEO. And since the AF also wanted to be able to abort after a single orbit (as did NASA), and land at the launch site (unlike NASA), the spacecraft would also require the ability to manuver significantly to either side of its orbital track to adjust for the launching point rotating away from it while in polar orbit - in a 90 minute orbit Vandenberg would move over 1,000 miles, whereas in a "normal" equatorial orbit NASA needed the range would be less than 400. This large 'cross-range' capability meant the craft had to have a greater lift to drag ratio than originally planned. This required the addition of bigger, heavier wings.

The answer within those groups dedicated to the shuttle was to show that as long as you have enough launches, the development cost of the system would be overwhelmed by the cost of the rockets you would otherwise throw away. One factor that needs to be considered is inflation though, and in the 1970s this was high enough that the payback from the development had to happen very quickly or that money would never pay for itself. In other words you needed a very high launch rate to make the system work.

Space Shuttle Columbia disaster
Space Shuttle Columbia disaster Crew of STS-107 on launch day () STS-107 was a space shuttle mission by NASA using the Space Shuttle Columbia. The entire seven member crew was killed on February 1, 2003, when the shuttle disintegrated over Texas during reentry into the Earth's atmosphere.This was the second total loss of a Space Shuttle, the first being Challenger. Table of contents showTocToggle("show","hide") 1 Timeline 2 Effect on US space program 3 Investigation 3.1 The Columbia Accident Investigation Board 4 Shuttle Crew of Flight STS-107 5 External Links Timeline At about 05:54 PST (08:54 EST), a California news photographer observed pieces breaking away from Columbia as it passed overhead, as well as a red flare coming from the shuttle itself. At about 09:00 EST (14:00

Canadian space program
Canadian space program Canada has contributed expertise and personnel to the world space effort, especially in collaboration with NASA. Eight Canadians have participated on 11 NASA missions to date: Name Shuttle Mission Launch Date Notes Marc Garneau Challenger STS-41-G October 5, 1984 First Canadian in space Roberta Bondar Discovery STS-42 January 22, 1992 First Canadian woman in space Steven G. MacLean Columbia STS-52 October 22, 1992 Chris Hadfield Atlantis STS-74 November 12, 1995 Marc Garneau Endeavour STS-77 May 19, 1996 Robert Thirsk Columbia STS-78 June 20, 1996 Bjarni Tryggvason Discovery STS-85 August 7, 1997 Dafydd Rhys Williams Columbia STS-90 April 17, 1998 Julie Payette Discovery STS-96 May 27, 1999 Marc Garneau Endeavour STS-97 November 30, 2000 Chris Hadfield Endeavour STS-100 April 19, 2001 First spacewalk by a

Space Shuttle Discovery
Space Shuttle Discovery Shuttle Orbiter Discovery (NASA Designation: OV-103) is a NASA Space Shuttle. First flown on August 30, 1984, Discovery is the third operational shuttle (excluding test shuttle 'Enterprise'). The orbiter is still operational today, and has performed both research and International Space Station (ISS) assembly missions. The craft takes its name from a ship used by explorer James Cook. Table of contents showTocToggle("show","hide") 1 Flights 1..1 Related articles 1..2