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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).
NASA/GSFC. A consortium of 40 international affiliates and U.S. institutions known as the Association of Universities for Research in Astronomy (AURA) recently unveiled a proposal to orbit a large, segmented-mirror telescope more than five times the diameter of the Hubble Space Telescope.