21世纪初的太空,一如上世纪六七十年代那样热闹,浩渺无垠的宇宙,强烈地吸引着地球人的目光。飞离地球,奔向太空,寻找新的生命与生存空间,成了人类探索太空的新使命。正如霍金所言:“我们正处于人类发展史上最危险的时刻。发展的技术摧毁了我们所生存的地球,而我们还没有发展出逃离地球的能力。”今天,人类的太空探索事业有了很大变化,关注热点从卫星上天、载人飞船、登上月球转向探索火星、土卫六、 The early 21st century space, as the sixties and seventies of last century as lively, vast expanse of the universe, strongly attracted the attention of the Earth’s people. Flying away from Earth, toward space, looking for new life and living space, has become a new mission of human exploration of space. As Hawking said: “We are at the most dangerous moment in the history of human development, and the technology we have developed has destroyed the Earth we live in while we have not yet developed the ability to flee the Earth.” Today, the human space exploration enterprise A lot of changes, the focus of attention from the satellite heaven, manned spacecraft, the moon turned to explore Mars, Titan,