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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).
Today, most people know of Edwin Hubble because of the Hubble Telescope. This is a large space telescope that was launched into orbit around the Earth in 1990 and still functions today. In order to understand why this revolutionary device was named after this scientist, itâs helpful to consider some Edwin Hubble greatest discoveries.