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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 the most famous-and probably most successful-space observatory ever flown. The 11 tonne telescope was placed into a 570 km high orbit around Earth by the Space Shuttle in April 1990. Circling our planet every 96 minutes, the HST has so far travelled some 5 billion km. Hubble has sent back a huge amount of scientific data and incredibly detailed images of every type of object in the sky. By autumn 2009, it had made nearly 900,000 observations and snapped over 570,000 images of more than 29,000 objects.