This Viking 1 orbiter image shows the rocky surface and thin atmosphere of Mars. NASA hide caption toggle caption NASA 13.7: Cosmos And Culture Why Do 202,586 People Want To Leave Our Planet For Mars? April 10, 2014 A Dutch organization called Mars One plans to establish a human colony on Mars by 2025. Anthropologist Barbara J. King wonders what it takes to leave your loved ones behind for the Red Planet.