SpaceX’s Polaris Dawn mission made history this month with the first-ever commercial spacewalk. It seems space travel is no longer reserved for highly trained government astronauts, but increasingly open to anyone with the funds (and the courage) to try it. But before we all go strapping on our spacesuits, Chris Impey, a professor of astronomy at the University of Arizona, says we need to be clear-eyed about the risks. Marketplace’s Meghan McCarty Carino spoke to Impey about those risks and the rewards that might make them worth it.