Panelists from left: Jim Crocker, head of Civil Space at Lockheed Martin, former NASA astronaut's Loren Shriver and Bruce McCandless, former ESA (European Space Agency) astronaut Claude Nicollier, and ESA astronaut Jean-Francois Clervoy are seen during 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.

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