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Life on Earth may have its origins in outer space, according to Nasa research. 根据美国航天宇航局Nasa的研究称，地球上的生命体可能是来源于外层空间。 Scientists have analysed meteorites that formed billions of years ago before falling to Earth. 科学家们是在分析检验了在数十亿年之前坠落到地球上的陨石之后得出这一发现的。 The carbon-rich fragments were found to contain chemicals similar to one of the key components of DNA, the building blocks of life. 在这种富含碳这种物质的碎片中，科学家们发现，其中具有某种与DNA关键成分相类似的化学元素，此中元素相当于构成生命的“基石”。 Tests show that the presence of these chemicals cannot be explained away by Earthly contamination, suggesting DNA’s origins may lie in outer space. 试验显示，这种化学元素是不可能通过存在于地球之上的物质所解释的，这也就意味着，DNA的起源可能来自于外太空。 The find comes from U.S. scientists, predominantly Nasa researchers, who analysed the chemical make-up of 12 meteorites. 该结论是出自于美国科学家的研究，其中的很多人都是美国航天宇航局的研究员，他们分析了构成12组陨石的化学元素。 Writing in the journal Proceedings of the National Academy of Sciences, the researchers said their find has ‘far-reaching implications’. | 
