With Mars the scientific stakes are arguably higher than they have ever been.The issue of whether life ever existed on the planet,and whether it persists to this day,has been highlighted by mounting evidence that the Red Planet once had abundant stable,liquid water and by the continuing controversy over suggestions the bacterial fossils rode to Earth on a meteorite(陨石)from Mars.A mor conclusive answer about life on Mars,past or present,would give researchers invaluable data about the range of conditions under which a planet can generate the complex chemistry that leads to life.If it could be established that life arose independently on Mars and Earth,the finding would provide the first concrete clues in one of the deepest mysteries in all of science:the prevalence of life in the universe.
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几个世纪以来,出于或多或少的经济原因及国家主义原因,探险家冒着生命危险深入到未知领域。哥伦布的西行是为了寻找一条更好的通往东方的贸易路线,也是为了进一步提升西班牙帝国的荣光。刘易斯和克拉克到美国的蛮荒之地旅行是为了弄清楚美国买下了路易斯安那后有什么收获。阿波罗号的宇航员飞向月球是冷战期间展示技术实力的一种戏剧性作态。
尽管他们的使命同商业的和政治军事的需要搀杂在一起,在进入科学家从未涉足之地的过程中,所有相关的探险者都取得了某种科学上的成就。
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