Human mission to Mars propellant from the Martian Atmosphere. This proposal drew on concepts developed by the former "Case for Mars" conference series. Over the next decade, Zubrin developed it into a mission concept, Mars Direct, which he presented in a book, "The Case for Mars" (1996). The mission is advocated by the Mars Society, which Zubrin founded in 1998, as practical and affordable. In 1991 in Toulouse, France, the International Space University studied an international human Mars mission. They proposed a crew of 8 traveling to Mars in a nuclear-powered vessel with artificial gravity provided by rotation. On the surface, 40 tonne habitats
Monuments of Mars with rescuing NASA astronauts that have gone missing in the fictional "monuments of Mars". Toward the end of each episode, groups of captured astronauts can be released from "energy rings". At the end of the final episode, markings on a "face" object reveal that some aliens were using Mars as a base to study humans from afar, but abandoned it and left their automatic intruder capture system switched on, hence the capture of the astronauts. In the game, the player controls an astronaut who must navigate through twenty levels on the planet Mars to finish the game. Most levels require