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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).
One advantage of the Hubble Space telescope over ground based ones is that. in orbit, it can operate close to its diffraction limit at visible wavelengths. It is diffraction that limits the ________ of a telescope of a given objective diameter.