Welcome to Mars follows the Mars rovers Spirit and Opportunity from the second they crash-land on the planet to many months into their ongoing mission.\rbr\rbrWelcome to Mars follows the Mars rovers Spirit and Opportunity from the second they crash-land on the planet to many months into their ongoing mission.\rbr\rbrSpace Documentary 2015 | Welcome to Mars SPACE & UNIVERSE, space exploration national geographic , space exploration movies, space exploration to .\rbr\rbrʬ pbs nova, pbs documentary, pbs documentaries full length, pbs nova full episodes, pbs nova documentaries, pbs nova 2014, pbs nova documentary 2014, .