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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