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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).
Astronomers can use the Hubble Space Telescope to view galaxies near the edge of the observable universe (the region of space from which light has had a chance to reach us within the last 13.77 billion years).