Tagy: mars, mars-video, space, science, exploration, prequel, short-film, iss, ham-radio, twins, astronauts, nasa, before-mars, mars, ron-howard, brian-grazer, national-geographic, nat-geo, natgeo, animals, wildlife, explore, discover, survival, nature, culture, documentary, space-travel, planet-mars, astronaut, the-red-planet, space-exploration, colonize-mars, live-on-mars, epic-series, space-documentary