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古代火星或有生命

2018-12-27 00:59:59   科技日报 

“好奇”号在火星发现古老有机分子

“好奇”号在火星发现古老有机分子

探索宇宙中的生命迹象,既是为了满足人类的好奇心,也是为了缓解人类在茫茫宇宙中的孤独感。

北京时间6月8日,美国国家航空航天局(NASA)宣布了两项关于火星的重要发现。其中一项是,“好奇”号漫游车在火星表面的沉积岩中发现了有机分子,说明火星可能曾存在远古生命。

有机分子由碳、氢组成,可能还包含氧、氮和其他元素。虽然有机分子通常与生命有关,但也可以通过非生物过程产生,并非存在生命的必要指标。

在盖尔陨石坑,“好奇”号钻入一块约30多亿年前的沉积岩仅5厘米时,发现了有机分子。此次识别出的分子包括噻吩、苯、甲苯以及丙烷、丁烯等短链碳,有机碳含量达百万分之十的数量级,约为此前在火星表面探测到的有机碳含量的100倍。

NASA戈达德太空飞行中心的珍妮弗·艾根布罗德表示,“好奇”号尚未确定有机分子的来源。无论这些有机物是远古生命留下的记录,或者没有生命也能存在,都能提供与火星环境和演变过程相关的化学线索。

责任编辑:路子康 CN078
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