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The "Mars ship" would be assembled in low-Earth orbit using three to four Ares V rockets - the new heavy-lift launch vehicle that Nasa has been developing. Notionally despatched in February 2031, the mission's journey from Earth to Mars would take six to seven months in a spacecraft powered by an advanced cryogenic fuel propulsion system. Estimates of the cost of mounting a manned Mars mission vary enormously, from $20bn to $450bn. The details are highly subject to change, and may not represent the way Nasa eventually chooses to go to the Red Planet. However, the document says this is the agency's current "best strategy" for landing humans on the Martian surface.