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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).
The Hubble Space Telescope (HST) is a space-based telescope that was launched in 1990 by the space shuttle. From its position 343 miles (552 km) above Earthâs surface, the HST has expanded our understanding of star birth, star death, and galaxy evolution, and has helped move black holes from theory to fact.he Hubble Space Telescope (HST) is a space-based telescope that was launched in 1990 by the space shuttle. From its position 343 miles (552 km) above Earthâs surface, the HST has expanded our understanding of star birth, star death, and galaxy evolution, and has helped move black holes from theory to fact.