Tags Barry DiGregorio Mars microbiology on Mars astrobiology on Mars Mars life detection Dr. Gil Levin Viking 1 and 2 Mars molecular life possibilities Viking GMS The Viking labeled release experiment planetary protection Mars Sample Return biological risk for Earth private Mars missions Scott Kelly DNA Martian moons launching the Tesla on FH Mars rocks UK Space Agency NASA Curiosity SAM Mars rovers Mars SOL 1903-2023 Mars Vera Rubin Ridge Humans to Mars Lop-G (Deep Space Gateway) Mars astronaut return possible contamination quarantine facility for Mars returns Mars life detection conspiracy theories Guest Barry DiGregorio Tagline Mars and astrobiology concerns View the discussion thread.