Humans are about to return to the Moon, and are working on a mission to Mars. Former NASA chief scientist Ellen Stofan explains why space exploration is so important for humanity. And why it can help us protect our 'pale blue dot' of a planet.] Guest:  Dr. Ellen Stofan, Under Secretary for Science and Research at The Smithsonian Interview by: Nikolai Khlystov, Lead, Future of Space, Shaping the Future of Mobility, World Economic Forum. More space from the Forum:  Other Radio Davos episodes on space: Check out all our podcasts on :     Join the  Episode transcript: