Former NASA astronaut Mike Massimino speaks as part of a panel discussion during an event celebrating the 25th Anniversary of the Hubble Space Telescope, Saturday, April 25, 2015 at the Steven F. Udvar-Hazy Center in Chantilly, Va. Massimino flew to the Hubble twice during Servicing Mission 3B in 2002 and Servicing Mission 4 in 2009 and completed four spacewalks in support of servicing the telescope.

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