Former NASA Administrator Charles Bolden, right, answers a question during a panel discussion with NASA Administrator Jim Bridenstine and former NASA Administrator Sean O'Keefe at an event celebrating NASA's 60th anniversary at the Center for Strategic and International Studies on Monday, July 23, 2018 in Washington. Bolden, Bridenstine, and O'Keefe answered questions about the past and future of the agency. (Photo Credit: NASA/Joel Kowsky)