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美宇航局:土星卫星有可能取代地球

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美国宇航局(NASA)的科学家日前宣称,最新证据表明,土星的最大卫星泰坦(即“土卫六”)存在生命迹象。
Scientists from NASA have found evidence of life on Saturn's biggest moon, Titan.
英国《每日电讯报》5日报道,科学家利用NASA土星探测船“卡西尼号”传回的数据,分析了土星泰坦表层的复杂化学物质。据了解,泰坦是目前所知的唯一拥有高密度大气层的土星卫星。数据显示,该卫星表层有群山、湖泊、河流,天文学家故而称其为太阳系中和地球最相似的“世界”。
Data from NASA's Cassini probe analyzed the complex chemistry on the surface of Titan - the only moon known to have a dense atmosphere. Its surface is covered with mountains, lakes and rivers which has led astronomers to call it 'the most Earth-like world in the solar system'.
结果发现,泰坦表面的流体是甲烷,也就是生命体的基础,并且氢气经泰坦的大气层向下流动,最后在地表消失,表明泰坦表面有外星生命消耗掉了这些气体。
Liquid on Titan is not water but methane, which leads scientists on a guess that life on the moon could be methane-based. The hydrogen gas flowing down through Titan's atmosphere disappears in the surface, suggesting it could be being breathed by alien bugs.
美国宇航局天体生物学家麦克凯伊说:“如果最终被证实为生命迹象,这将是双重惊喜。因为它不仅证明了外太空有生命存在,同时还意味着与地球生命迥然不同的、并非以水为生的第二种生命形式也存在。”
NASA astrobiologist Chris McKay said: 'If these signs do turn out to be a sign of life, it would be doubly exciting because it would represent a second form of life independent from water.'
此外,科学家还坚信未来太阳将会膨胀,吞噬地球,但泰坦则会变得暖和而条件宜人。
Scientists believe that when the Sun swells up in four billion years, swallowing the Earth, conditions could be ideal on a warmer Titan.
英国大学教授扎尼基则成:“我们相信泰坦有形成生命必需的化学物质。只要光和热足够,生命构造过程就会开始。40亿年之后,当太阳膨胀成一颗红色巨星,泰坦就成为宇宙生命天堂。”
Professor John Zarnecki, of the Open University, said: 'We believe the chemistry is there for life to form. It just needs heat and warmth to kick-start the process. In four billion years' time, when the Sun swells into a red giant, Titan could become a paradise.'
标签:地球 宇航局
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2010-06-08 14:20 编辑:kuaileyingyu
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