Anthropologist Lisa Messeri talks about planetary scientists and the way they use data to bring these places to life. Messeri is the author of Placing Out Space: An Earthly Ethnography of Other Worlds.

Michael Benson talks about the making of 2001, a movie inspired by the collaboration of American director Stanley Kubrick and the British futurist Arthur C. Clark.

Jason Smith discusses the U.S. Navy's role in exploring and charting the ocean world. Smith is an assistant professor of history at Southern Connecticut State University. He's the author of To Master the Boundless Sea: The U.S. Navy, the Marine Environment, and the Cartography of Empire.

Bill Rankin talks about the changes brought about by GPS and other mapping technologies in the twentieth century. Rankin is the author of After the Map: Cartography, Navigation, and the Transformation of Territory in the Twentieth Century.

Astronaut Garrett Reisman talks about life aboard the International Space Station. Reisman flew on two shuttle missions to the station and conducted three seven-hour spacewalks during his 107 days in space.