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Aerobraking airship Apollo ascent stage back to Earth boost modules bottom control module cosmonauts were given crater crewmen descent discovery docked Earth for analysis Earth orbit eight months eight-month voyage escape velocity flight to Mars float geological go to Mars Habitat Module huge canyon Joshua Stoff lander landing module launched layers long trip Mariner Valley Mars mission spacecraft Mars orbit Mars rover MARS SPACE TRAIN Mars's Martian atmosphere Martian surface meteor miles per hour million moon mother ship Mount Everest Museum needed orbiting crew members oxygen Phobos pilot Pole propulsion module recreation module red planet reentry rendezvous retrorockets returned to Earth Robots rock rocket engines rover drove Ruslan safely Salyut module Salyut Space Station samples scientists solar panels solar system Soviet space shuttle spaceships spacesuits sun's surface of Mars Tharsis thin thirteen minutes trip to Mars ultralight unmanned vehicle zero gravity