Technosignatures: Detecting Alien Civilizations, with David Grinspoon

Hunt for technosignatures, alien civilizations, and other signs of intelligent life as astrobiologist David Grinspoon, co-host Chuck Nice, and astronomer Sofia Sheikh answer fan-submitted Cosmic Queries on the search for extraterrestrial intelligence. Don’t miss an episode of StarTalk All-Stars. Subscribe on: TuneIn: http://tunein.com/radio/StarTalk-All-Stars-p949405/ SoundCloud: https://soundcloud.com/startalk_all-stars Apple Podcasts: https://itun.es/us/P9kphb.c Stitcher: http://www.stitcher.com/podcast/startalk-allstars Google Play Music: https://play.google.com/music/listen#/ps/I2nz5bguurd5se7zu4fhnd25lk4NOTE: StarTalk All-Access subscribers can watch or listen to this entire episode commercial-free here: https://www.startalkradio.net/all-access/technosignatures-detecting-alien-civilizations-with-david-grinspoon/Photo Credit: NASA.