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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 telescope is an instrument that, in principle, enables the observer to see the stars and planets with a much larger eye. Telescopes use either a lens or a mirror. The lens of the Hubble is 371 times wider than that of the human eye at max dilation. The larger a telescopeâs lens or mirror, the greater its ability. to collect light, and hence the greater the distance it can see.