首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
【T1】When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep yo
【T1】When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep yo
admin
2020-03-30
33
问题
【T1】
When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep your space-probes sterile(无菌的).
NASA, America’s space agency, certainly does so. After all, you would not want bugs from one planet to contaminate another where they might possibly thrive.
But according to Curt Mileikowsky, of the Royal Institute of Technology in Stockholm, this may already have happened naturally billions of years ago when the solar system was young. For Dr. Mileikowsky has taken a century-old idea called panspermia(有生源说), and shown that it is plausible.
【T2】
Panspermia is the theory that life does not start independently on each planet that has it(assuming that other planets do). Rather, it hops from place to place, "infecting" new worlds as it goes.
Supported by experts in biology, geology and celestial mechanics, Dr. Mileikowsky argued to the American Astronomical Society meeting in Atlanta that this is not as outlandish as it sounds.
【T3】
Bungling(笨手笨脚的)space organizations apart, the only mode of travel open to microbes seems to be meteorites(流星). Most of these are small bits of junk from the asteroid(小行星)belt that have gone off course.
But some are rocks that have been flung into space from the surfaces of planets as a result of those planets having been struck by even larger bits of rock—decent-sized asteroids or comets.
【T4】
If there is life on such a planet, microscopic forms of it will probably live deep inside rocks, as they do on earth. The acceleration of lift-off would not kill something that size.
【T5】
If a rock is large enough, the heat generated as it is thrown clear will be negligible except at its surface—where, if anything, melting may even produce an airtight skin to protect any microbes deeper down from the unpleasant vacuum of space.
【T4】
选项
答案
如果这类行星上存在生命的话,微生命形式很可能生活于岩石的深处,正如它们在地球上一样。岩石被抛离的加速度不会毁灭那么小的东西。
解析
转载请注明原文地址:https://kaotiyun.com/show/pQTO777K
0
考博英语
相关试题推荐
Whatdotheextraordinarilysuccessfulcompanieshaveincommon?Tofindout,welookedforoperations.Weknowthatcorrelation
Therearefourbasictypesofcompetitioninbusinessthatformacontinuumfrompurecompetitionthroughmonopolisticcompetiti
Weshallprobablyneverbeableto______theexactnatureofthesesub-atomicparticles.
Thetimberrattlesnakeisnowontheendangeredspecieslist,andisextinctintwoeasternstatesinwhichitonce______.
Consumersdeprivedoftheinformationandadvicetheyneededwerequitesimply______everycheatinthemarketplace.
ToproducetheupheavalintheUnitedStatesthatchangedandmodernizedthedomainofhighereducationfromthemid1860’stot
ToproducetheupheavalintheUnitedStatesthatchangedandmodernizedthedomainofhighereducationfromthemid1860’stot
AcenturyagointheUnitedStates,whenanindividualbroughtsuitagainstacompany,publicopiniontendedtoprotectthatcom
TheCommitteepronouncedfourmembersexpelledforfailuretoprovideinformationinthe______ofinvestigations.(2002年中国科学院考博试题)
随机试题
关于路基工程石方施工安全要点的说法错误的是()。
抑郁质的人适宜从事的工作是
脑血栓形成最常见的病因脑栓塞最常见的病因
法律实现的标准有许多方面,但是不包括下列哪一个选项?
(2005年)折杆受力如图5—63所示,以下结论中错误的为()。
强台风的中心风力为14~15级,风速为()。
下列不能保证法实施的是( )。
2005年我国滨海旅游业继续保持强劲的增长态势,全年滨海旅游收入5052亿元;增加值2031亿元,比上年增长32.4%。全国滨海国内旅游收入3887亿元,比上年增加1391亿元。海洋交通运输业继续保持良好的发展态势,2005年营运收入达2940亿元,占全国
原型文本
在黑盒测试方法中,设计测试用例的主要根据是()。
最新回复
(
0
)