Summary: This episode with guest Dr. Chris McKay from the NASA Ames Research Center talks about astrobiology and the search for life in the universe. Living things have been found in very extreme environments on Earth, like hot springs, or near underwater volcanoes, or hidden beneath the Antarctic ice pack, or even inside rocks. Could life exist in those same kinds of places on other planets? When we look for signs of life on other worlds, what would we look for? How do we search it out? And, how would we know if what we find is caused by living things -- or some other physical process?
