Former NASA astronaut Bruce McCandless speaks during a panel discussion as part of an event celebrating the 25th Anniversary of the Hubble Space Telescope, Saturday, April 25, 2015 at the Smithsonian's Steven F. Udvar-Hazy Center in Chantilly, Va. McCandless flew as a mission specialist aboard space shuttle Discovery on STS-31 in 1990, the mission that deployed the Hubble.

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