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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).
Reflecting telescopes are better than refracting telescopes because they have a much clearer picture and are cheaper to make. The Hubble Space Telescope is the largest space reflecting telescope. The largest size of any one mirror in a reflecting telescope can vary and have reached lengths as high as 10 meters.eflecting telescopes are also called reflectors. Most telescopes used by astronomers today are reflectors. In Newtonian telescopes, one mirror is used to capture the image while another mirror is used to reflect the image from the first mirror.