Glen Asner and Stephen Garber talk about NASA’s efforts to plan ambitious missions in the face of huge political and financial challenges. Asner is the Deputy Chief Historian for the Historical Office, Office of the Secretary of Defense (OSD). Garber works in the NASA History Division at NASA Headquarters. They are the authors of Origins of 21st-Century Space Travel: A History of NASA’s Decadal Planning Team and the Vision for Space Exploration, 1999–2004. Learn more about your ad choices. Visit megaphone.fm/adchoices