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ALT
Tim Finn and Liam O'Maonlai. ALT is also an abbreviation for Assistant Language Teacher, the job title of people on the JET Programme. ALT was also an acronym by the NASA for the Approach and Landing Tests of the Space Shuttle in 1976. ALT can mean alternative lengthening of telomeres, a mechanism (other than telomerase) that cells use to maintain telomere length.

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

Shuttles
4 The Shuttle decision
5 Shuttle development
6 The Shuttle in retrospect
7 Shuttle description
8 Shuttle accidents
9 Previous Programs
10 External links

Components

The Space Shuttle consists of four main components:

Space Shuttle program
Space Shuttle program Space Shuttle Columbia, 1981 (NASA) NASA's Space Shuttle program is an ongoing endeavor, started in the late 1960s, that has created the world's first partially reusable space launch system, and the first spacecraft capable of carrying large satellites both to and from low Earth orbit. Each shuttle is designed for a projected lifespan of 100 launches. The original purpose of the program was to ferry supplies to a space station. In reality, the Shuttle is the United States' sole manned launch vehicle and has totally dominated NASA's operations since the mid 1970s. With the construction of the International Space Station the Shuttle has finally begun to be used for its original purpose. In January 2004, it was announced that the Shuttle fleet would