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With this telescope in the 1920's Edwin Hubble measured distance and velocity of galaxies, work which led to discovery of the expanding galaxy. (https://asd.gsfc.nasa.gov/archive/hubble/overview/timeline.html)
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Astrophysicist Lyman Spitzer gathered the support of other astronomers for a "large orbital telescope". (https://asd.gsfc.nasa.gov/archive/hubble/overview/timeline.html)
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America Congress approves funding for large space telescope.
(http://www.spacetelescope.org/about/history/timeline/) -
Hubble Space Telescoped deployed into orbit. (https://www.nasa.gov/mission_pages/hubble/story/timeline.html)
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First servicing mission for the Hubble Telescope. (https://asd.gsfc.nasa.gov/archive/hubble/overview/timeline.html)
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