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1、地球由两颗星行相撞而成张铁城2016、2、3张铁城下载110No.7参考消息2016/1/31地研认为地球由两颗星行相撞而成※英国《每日电讯报》：Earthisactuallytwoplanets,scientistsconcludeBy SarahKnapton, ScienceEditorTelegraph29Jan2016※参考消息译文：【英国《每日电讯报》网站1月30日报道】题：科学家断定，地球其实是两颗行星(记者萨拉斯纳普顿)简介这篇是有关宇宙形成的科普文章。究竟这类语篇的词汇有多么难，还不知道，不妨做一项词汇级别统计词汇级别统计，看看：一级词
2、汇是否占70%左右？现在我只把这个有857个英语单词的语篇的头100个单词的词汇级别统计一下，结果：一级词汇65个，占65.00%；一级、二级、三级词汇总计：83个，占83%。。你如果不放心，自己可以试着完成全文词汇级别统计。附件中有关于词汇级别统计的说明，以及头100个单词的统计结果。TheearlyEarthwasmixedwithababyplanetcalledTheiafollowingaheadoncollision4.5billionyearsago,scientistshavefoundToday'sEarthismadeupofearl
3、yEarthandtheembryonicplanetTheia Photo:ALAMYBy SarahKnapton, ScienceEditor12:56PMGMT29Jan2016Earthisactuallymadeupfromtwoplanetswhichcametogetherinahead-oncollision thatwassoviolentitformedtheMoon,scientistshaveconcluded.Initiallyitwasbelievedthatthe Moon wascreatedwhenasmallerpl
4、anetcalledTheiagrazedtheEarthandbrokeup,sendingasmallerchunkintospacewhereitwascaughtinEarth’sgravity.ButifthatwasthecasetheMoonwouldhaveadifferentchemicalcompositiontotheEarth,becauseitwouldbemadeup,predominantly,ofTheia."Theiaprobablywouldhavebecomeaplanetifthecrashhadnotoccurr
5、ed"ProfEdwardYoung,UniversityofCaliforniaHowever,afterstudyingMoonrocksbroughtbackbyastronautsontheApollomissions,scientistsattheUniversityofCalifornia havefoundthattheiroxygenisotopesarethesameasonEarth.ItmeansthatthecollisionbetweenTheirandtheearlyEarthwassoviolentthatthetwopla
6、netseffectivelymeldedtogethertoformanewplanet,achunkofwhichwasknockedofftoformtheMoon.“Wedon’tseeanydifferencebetweentheEarth’sandtheMoon’soxygenisotopes;they’reindistinguishable,”saidEdwardYoung,leadauthorofthenewstudy andaUCLAprofessorofgeochemistryandcosmochemistry.“Theiawasth
7、oroughlymixedintoboththeEarthandtheMoon,andevenlydispersedbetweenthem.“Thisexplainswhywedon’tseeadifferentsignatureofTheiaintheMoonversustheEarth.”ProfessorEdwardYoungThecrashwithTheiahappenedapproximately100millionyearsaftertheEarthformed,almost4.5billionyearsago.ItwasthoughtThe
8、iahadcollidedwithEarthatanangleof45degre
