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We are all Martians \u2026 or could be, if, billions of years ago, Red Plant microbes fell to Earth and eventually evolved to us. Okay, that one\u2019s a big \u201cif.\u201d But microbes can survive space travel. Meet the NASA officer whose task is to keep Earth, Mars - and the entire solar system \u2013safe from hitchhiking bacteria.\nAnd, even if we\u2019re not Martians (darn!), did life once thrive on the Red Planet ... and does it still today?\nPlus, why meteorites may be happy habitats for life.\nGuests:\n\n\nCatharine Conley - NASA planetary protection officer\n\n\nChris McKay - Planetary scientist, NASA Ames Research Center\n\n\nPaul Davies - Director of the BEYOND: Center for Fundamental Concepts in Science at Arizona State University\n\n\nAaron Burton - Astrobiologist, NASA Goddard Spaceflight Center\n\n\nDebbie Kolyer - Grants Manager, SETI Institute\n\nDescripci\xf3n en espa\xf1ol\n\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices