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The Hubble Space Telescope is a telescope located at the outer edges of Earth's atmosphere. The telescope was launched by Space Shuttle Discovery on April 24, 1990. This had been postponed from a 1986 launch date by the Space Shuttle Challenger explosion. It was later discovered that the main mirror had a defect, which was repaired in December 1993. Hubble's scientific successor, the James Webb Space Telescope is scheduled for launch in December, 2021.