人类首次登陆月球40周年庆典已经结束,但是美国宇航局能否把人类送上火星仍是一个谜。当前的科技水平可能刚刚达到,也有可能还远远不及前往火星的载人任务所需的技术水平。因此前往这颗红色行星的载人任务仍是一个巨大挑战。但是美国宇航局仍坚持远征火星,而且有关火星探索的新想法层出不穷。休斯敦美国宇航局约 The 40th anniversary of humanity’s first landing on the moon is over, but whether NASA can send humans to Mars is still a mystery. The current state of science and technology may have just arrived, and may well fall far short of the skill levels required for manned missions to Mars. Therefore, the manned mission to this red planet remains a huge challenge. But NASA remains insistent on expedition to Mars, and new ideas are emerging about Mars exploration. Houston NASA