Podcast:TED Radio Hour Published On: Fri Dec 21 2018 Description: Colonizing Mars or more distant planets seems like science fiction. But becoming a spacefaring species may be in our near future. This hour, TED speakers on living beyond Earth--and whether we should. Guests include NASA Chief Scientist James Green, science writer Stephen Petranek, MIT Media Lab researcher Lisa Nip, and astronomer Lucianne Walkowicz.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy