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Hubble is the only telescope designed to be serviced in space by astronauts. After launch by Space Shuttle Discovery in 1990, four subsequent Space Shuttle missions repaired, upgraded, and replaced systems on the telescope. A fifth mission was canceled on safety grounds following the Columbia disaster (2003).
A simpler way to overcome the atmospheric distortions is to put your telescope above the atmosphere. The Hubble Space Telescope orbits 600 km above the Earth and has been sending back the most amazing images of our universe since 1993.