Tags Dr. Gil Levin Barry DiGregorio UK Space Agency Mars Science Laboratory Participating Scientist Program NASA's Michael Meyer research proposal searching for life on Mars Viking 1 and 2 NASA rejection of proposal UK Space Agency Letter of Endorsement and Funding Curiosity Mars sample return mission planetary protection potential biohazards SpaceX and Mars Humans to Mars finding living molecules on Mars Mars Gateway Lunar Gateway Mars subsurface ice Dr. Robert Zubrin Viking mission Mars photos photosynthesis O2 in the Mars atmosphere Mars bioforms C14 label release experiment microorganism dangers objective panel analysis of Viking Lander findings Martian atmospheric gasses and isotopes Guest Dr. Gilbert Levin Barry DiGregorio Tagline Mars search for life, Viking, news and updates View the discussion thread.