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我们已经知道怎样前往火星,也知道怎样在火星上着陆。现在面临的困难问题是,怎样离开火星,返回地球。火星上升飞行器美国航空航天局为了完成离开火星这个任务需要制造的宇宙飞船——火星上升飞行器(简称MAV),面临一个巨大的工程挑战。如果这个飞行器满载燃料,就
We already know how to get to Mars and how to land on Mars. The difficult question now facing is how to leave Mars and return to Earth. Mars Rising Aircraft NASA is facing a huge engineering challenge to build its spacecraft, the Mars Ascent Lifts (MAV), needed to complete its mission to leave Mars. If this aircraft is full of fuel, then