Are We Alone in the Universe?
How did life begin on Earth? Curiously, scientists often search for the answer on other planets or moons in our solar system. After all, if we want to see whether our theories are right, we need to find another example of life somewhere. The search has taken us to some strange places seemingly frozen in time that give us hints to what Earth looked like billions of years ago when life first appeared in the geologic record: places like Mars that show evidence of fossil oceans, and places like Saturn\u2019s moon, Enceladus, that show evidence of liquid water oceans containing organic molecules hidden under an icy crust. NASA astrobiologist Chris McKay has been a member of missions that sent spacecraft to these and other places in search of that elusive other example of life in the universe. He recently sat down with producer Miles Traer to discuss the best current theories for the origin of life on Earth, why Antarctica is a lot like one of Saturn\u2019s moons, the challenges of collecting data from other planets, and the reasons we\u2019re captivated by the question, \u201cAre we alone in the universe?\u201d Generation Anthropocene is supported by Stanford's School of Earth, Energy & Environmental Sciences and by Worldview Stanford.\nLearn more about your ad choices. Visit megaphone.fm/adchoices