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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).
Repairing Hubble: From the First to the Last Repair Mission. The Hubble Space Telescope after it had been serviced by the space shuttle Discovery in 1997. The Hubble Telescope: From First Launch to Last Repair Mission. In its 20 years, the Hubble Space Telescope has transformed the way astronomers view the universe. It introduced people on Earth to far-off galaxies, and revealed new information to help scientists understand how the universe began, and what is in store for the future.