精选优质文档-倾情为你奉上2005 春季1. Asked how long it could be before astronauts land on mars, Arthur Thompson, mission manager for MER surface operation said, “my best guess is 20 to 30 years, if that becomes our primary priority.当问到宇航员还要过多久才能登上火星时，“火星探测漫游者”地表探测任务小组负责人Arthur Thompson说，“如果我们把登上火星作为首要目标的话，我预计最快要20-30年。”2. such a mission would take 11 to 12 months to get to mars and it would be impossible to carry enough water for astronauts, plus the water needed to make rocket fuel for the return
