Art Bell is joined by planetary scientist Dr. David Grinspoon, curator of astrobiology at the Denver Museum of Nature and Science and a recipient of the Carl Sagan Medal. The conversation ranges from the likelihood of extraterrestrial life to the private space travel revolution, with Grinspoon noting that the discovery of billions of exoplanets has transformed alien life from speculation into statistical probability. He argues that any intelligent species humanity encounters will almost… Full show notes & guests: https://artbellarchive.org/episode/april-9-2010-astrobiology-and-astronaut-training-david-grinspoon