The first pictures of Pluto sent by the New Horizons spacecraft last month took scientists by surprise. They had expected Pluto’s surface to be riddled with impact craters. It's not. That raises a question: Why did scientists expect to see so many craters in the first place? And why aren’t they there?
Doug Duncan, director of Boulder’s Fiske Planetarium, joined Colorado Matters host Ryan Warner to discuss Colorado-based research that helps predict impacts in space and a hypothesis that liquid water is seeping into and masking Pluto's craters.
