Listen to an hour with the late Lloyd Motz, Professor Emeritus of Astronomy at Columbia University, and the late broadcaster Hugh Downs, as they discuss Motz’s life and work, including his book “The Essentials of Astronomy,” which is arguably the best introductory astronomy text ever written. Downs is a former student who took astronomy at Columbia in 1957. Dr. Motz, who was named professor emeritus in 1977, believes the major discoveries in physics have already been made, and that what remains is for science to harness that knowledge to humanity’s benefit. It was originally recorded in 1999.