In this podcast, NOVA's Peter Tyson interviews former astronaut Buzz Aldrin. Aldrin was the second man to set foot on the Moon, and thinks that a human presence on Mars is inevitable in the future. Listen in to find out why.

Produced by David Levin. Original interview by Peter Tyson. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers.

Learn more about the future of human spaceflight at pbs.org/nova/space