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  3. Scientists hope that a remote lake on a

Scientists hope that a remote lake on a

天天题库2020-05-20  62
问题 Scientists hope that a remote lake on a dormant Chilean volcano can provide clues to what life may have been like in a far more distant place—the planet Mars.A 10-member team placed special plates in the lake on Licancabur volcano, at an altitude of 20,000 feet，on Sunday to measure the effects of ultraviolet light on organisms living there.The scientists, mostly from the United States, think learning how Licancabur organisms protect themselves may help researchers understand how life survived on early Earth and perhaps on early Mars as well.The damaging effects of UV radiation intensify at altitude and the air is very thin. And the lake is covered with ice most of the year, as would have been bodies of water on Mars.“If there was life on Mars 3.5 billion years ago, it could have used defense mechanisms similar to those used by the organisms at Licancabur volcano to survive,” said team leader Nathalie Cabrol.
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答案
解析在智利火山的顶端，有一个静谧的湖泊。近来，科学家发现了它的新价值——也许，它能告诉人们在更遥远的火星，早期的生命是如何存在的。11月10日，一个由10名科学家组成的小组在海拔2万英尺的利坎卡武尔火山顶端湖泊中放入了特殊的测量仪板，来测试紫外线照射当地的有机生物所产生的效果。以美国科学家为主的许多科学家都认为，研究利坎卡武尔火山的有机生物如何自我保护能够启发人们认识在早期的地球，生物是如何生存下来的，甚至也可以由此类推到早期的火星生命形态上去。在利坎卡武尔火山顶，紫外线辐射相当密集，杀伤力很强。空气也因为海拔高而非常稀薄，湖面上常年结着厚厚的冰层，与火星上的水域环境非常相似。研究小组的负责人纳塔莉·卡布罗尔说：“如果5亿年前火星上有生物的话，情况应该与利坎卡武尔火山顶生物生存下来所运用的防御机制大致相同。”
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