美宇航局称地球生命或源于外层空间
<p><span word="Life">Life</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="may">may</span> <span word="have">have</span> <span word="its">its</span> <span word="origins">origins</span> <span word="in">in</span> <span word="outer">outer</span> <span word="space">space</span>, <span word="according">according</span> <span word="to">to</span> <span word="Nasa">Nasa</span> <span word="research">research</span>. 根据美国航天宇航局<span word="Nasa">Nasa</span>的研究称，地球上的生命体可能是来源于外层空间。</p><p><span word="Scientists">Scientists</span> <span word="have">have</span> <span word="analysed">analysed</span> <span word="meteorites">meteorites</span> <span word="that">that</span> <span word="formed">formed</span> <span word="billions">billions</span> <span word="of">of</span> <span word="years">years</span> <span word="ago">ago</span> <span word="before">before</span> <span word="falling">falling</span> <span word="to">to</span> <span word="Earth">Earth</span>.</p><p>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。</p><p><span word="The">The</span> <span word="carbon">carbon</span>-<span word="rich">rich</span> <span word="fragments">fragments</span> <span word="were">were</span> <span word="found">found</span> <span word="to">to</span> <span word="contain">contain</span> <span word="chemicals">chemicals</span> <span word="similar">similar</span> <span word="to">to</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="key">key</span> <span word="components">components</span> <span word="of">of</span> <span word="DNA">DNA</span>, <span word="the">the</span> <span word="building">building</span> <span word="blocks">blocks</span> <span word="of">of</span> <span word="life">life</span>.</p><p>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<span word="DNA">DNA</span>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”。</p><p><span word="Tests">Tests</span> <span word="show">show</span> <span word="that">that</span> <span word="the">the</span> <span word="presence">presence</span> <span word="of">of</span> <span word="these">these</span> <span word="chemicals">chemicals</span> <span word="cannot">cannot</span> <span word="be">be</span> <span word="explained">explained</span> <span word="away">away</span> <span word="by">by</span> <span word="Earthly">Earthly</span> <span word="contamination">contamination</span>, <span word="suggesting">suggesting</span> <span word="DNA">DNA</span>’<span word="s">s</span> <span word="origins">origins</span> <span word="may">may</span> <span word="lie">lie</span> <span word="in">in</span> <span word="outer">outer</span> <span word="space">space</span>.</p><p>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，<span word="DNA">DNA</span>的起源可能来自于外太空。</p><p><span word="The">The</span> <span word="find">find</span> <span word="comes">comes</span> <span word="from">from</span> <span word="U">U</span>.<span word="S">S</span>. <span word="scientists">scientists</span>, <span word="predominantly">predominantly</span> <span word="Nasa">Nasa</span> <span word="researchers">researchers</span>, <span word="who">who</span> <span word="analysed">analysed</span> <span word="the">the</span> <span word="chemical">chemical</span> <span word="make">make</span>-<span word="up">up</span> <span word="of">of</span> 12 <span word="meteorites">meteorites</span>.</p><p>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。</p><p><span word="Writing">Writing</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Proceedings">Proceedings</span> <span word="of">of</span> <span word="the">the</span> <span word="National">National</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Sciences">Sciences</span>, <span word="the">the</span> <span word="researchers">researchers</span> <span word="said">said</span> <span word="their">their</span> <span word="find">find</span> <span word="has">has</span> ‘<span word="far">far</span>-<span word="reaching">reaching</span> <span word="implications">implications</span>’.</p>
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