Former NASA Administrator Charles Bolden, right, answers a question during a panel discussion led by Todd Harrison, director of defense budget analysis and the aerospace security project, and senior fellow in the international security program at the Center for Strategic and International Studies, 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)