The crew of STS-125, the final Hubble Servicing Mission, participate in 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. From left: former NASA astronauts John Grunsfeld, Michael T. Good, Mike Massimino, Scott Altman, Gregory C. Johnson, and current NASA astronauts Megan McArthur Behnken and Andrew Feustel.

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Keywords: ., 25th, altman, andrew, anniversary, behnken, center, chantilly, feustel, good, gregory, grunsfeld, hubble, joel, john, johnson, kowsky, launch, massimino, mcarthur, megan, michael, mike, nasa, rocket, scott, space, steven, telescope, udvar-hazy, va