Tags John Batchelor Dr. David Grinspoon Dr. David Livingston Mars Perseverance Rover Mars 2020 mission nuclear RTG power Martian rocks river delta volcanic material impact ejecta Perseverance cameras Martian color Martian sounds ice maximizing chances for past life discovery Guest John Batchelor Dr. David Livingston Dr. David Grinspoon Tagline Hotel Mars with Grinspoon on Mars and more View the discussion thread.