NASA astronaut Andrew Feustel speaks as part of a panel discussion at 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. Feustel participated in three of the final servicing mission's five spacewalks.

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Keywords: ., 25th, andrew, anniversary, center, chantilly, feustel, hubble, joel, kowsky, launch, nasa, rocket, space, steven, telescope, udvar-hazy, va