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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 was designed to view optical light (which we see with our eyes), plus ultraviolet and infrared parts of the electromagnetic spectrum. Ultraviolet light is emitted by very energetic objects and events, including our Sun. If you've ever gotten a sunburn, it was caused by ultraviolet light.