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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).
Hubble's second huge advantage is its ability to observe near-infrared and ultraviolet light, which is otherwise filtered away by the atmosphere before it can reach ground-based telescopes. Find out more about the spacecraft Hubble and see images of it in flight. Hubble has made many contributions to science since its launch in 1990. With 10 000 scientific papers attributed to it, Hubble is by some measures the most productive scientific instrument ever built. This section outlines the background to some of the key areas of research Hubble has contributed to.