Richard speaks with a professor of astrobiology about the panspermia hypothesis, the theory that all life on Earth originates in outer space. Guest: Chandra Wickramasinghe, PhD is the director of the Centre for Astrobiology at the Universty of Buckingham.   A professor of applied mathematics and astronomy. He is the editor in chief of the Journal of Astrobiology and Outreach and co-author of Cosmic Womb: The Seeding of Planet Earth and his latest, Our Cosmic Ancestry in the Stars. He lives in Cardiff, Wales.