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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).
This Incredible 1.5-Billion-Pixel Image Is the Biggest Hubble Picture Ever; The Largest Radio Telescope in the World Could Be Shuttered; The 5 Most Powerful Telescopes, and 5 That Will Define the Future of Astronomy; giant magellan telescope; thirty meter telescope; hubble space telescope; telescopes