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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 Earth's atmosphere is about 120 miles thick and anything we see from the surface of the Earth is distorted by the water vapor and debris that is in the air. If you are in space you do not have this distortion. The Hubble Telescope is a good example of space based telescopes. Scientists have put telescopes in space to avoid interference by the atmosphere. SOURCE: -Page 560 of Holt Science & Technology Earth Science -Chapter 18-Studying Space -Section 2- Telescopes -Optical Telescopes in Space.