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Former NASA astronaut and United States Senator, John Glenn, joins fellow astronauts during the group photo following the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.    Mike Lynaugh

Former NASA astronaut and United States Senator, John Glenn, joins fellow astronauts during the group photo following the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012. 

Mike Lynaugh