Former astronaut and United States Senator John H. Glenn Jr. (Democrat of Ohio, retired) compares early space flight to present day pursuits while addressing the crowd gathered for Space Day activities at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Virginia on May 6, 2004.  His words came shortly before the presentation of NASA's 2004 class of astronaut candidates..Mandatory Credit: Renee Bouchard / NASA via CNP
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