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b'If a tree fell on another planet, would we be able to detect it? Not quite yet \\u2013 but we might be able to tell if the planet was habitable. A living-planet is the promise of newly-discovered Gliese 581g. But does the planet exist at all?\\nDiscover how we learn a planet\\u2019s geology and chemistry from afar. Also, what we learn about a civilization from what it discards, beginning with our own sloppy habits.\\nPlus, the hunt for derelict alien spaceships\\u2026 and a man who sketches alien creatures for a living - based on real science.\\nGuests:\\n\\n\\nLisa Kaltenegger - Astronomer, Harvard-Smithsonian Center for Astrophysics\\n\\n\\nBrad Bebout - Biologist, NASA Ames Research Center\\n\\n\\nRobin Nagle - Anthropologist, New York University\\n\\n\\nRobin Hanson - Economist, George Mason University\\n\\n\\nJoel Hagen - Computer graphics instructor, Modesto Junior College\\n\\nDescripci\\xf3n en espa\\xf1ol\\nLearn more about your ad choices. Visit megaphone.fm/adchoices'