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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).
New Scientist: NASA gears up for its last mission to Hubble NASA: Hubble Opens New Eyes on the Universe According to NASA, the Hubble Space Telescope orbits the Earth once every 96 minutes.