This National Geographic documentation draws on interviews with police officers, pilots, military personnel, scientists and ordinary citizens who give extraordinary accounts of encounters with the unexplained. While professional skeptics about UFOs speak out, including scientists who are leading the search for life forms elsewhere in the universe. The documentation also examines the most recent advances in the search for life on other planets. This past summer, NASA’s Phoenix Mars Lander, a robot that tests and analyzes soil on the planet, found conclusive evidence of water ice on Mars. You’ll hear from scientists on the project about the real possibility of finding life on Earth’s next-door neighbor.