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The Hubble Space Telescope is a 2.4-meter reflecting telescope, which was deployed in low-Earth orbit (600 kilometers) by the crew of the space shuttle Discovery (STS-31) on 25 April 1990. HST is a cooperative program of the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA) to operate a long-lived space-based observatory for the benefit of the international astronomical community. HST is an observatory first dreamt of in the 1940s, designed and built in the 1970 and 80s, and operational since the 1990s. Since its preliminary inception, HST was designed to be a different type of mission for NASA -- a long-term space-based observatory. Read more