Tags Dr. Gil Levin Dr. Patricia Ann Straat To Mars With Love, Mars Viking landers Martian microbial life planetary protection Mars Sample Return caution in Mars life back to Earth Mars sample return off Earth locations Habitability, Brine Irradiation and Temperature package (HABIT) returning to the Moon lunar sample quarantine life on Mars locations NASA Planetary Protection Office Mars rock colors Mars green color confirming life on Mars challenges Carbon 14 technology & ITAR searching for life with large Earth telescopes infrared telescopes Moon as a stepping stone to Mars NASA Mars life detection experiments Mars methane Guest Dr. Gilbert Levin Dr. Patricia Ann Straat Tagline More on Mars Viking, Dr. Straat's new book, "To Mars with Love" View the discussion thread.