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
考研
Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to
Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to
admin
2010-01-13
105
问题
Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to the mysteries of cosmogony in an 1848 public lecture, just reprinted by Hesperus Press. And we encountered a reference to cosmogonists most recently in a new edition of Poe’s prose poem Eureka.
What’s the difference between cosmologists and cosmogonists? Just two letters and a few billion light years. Cosmologists worry about where the Universe came from, cosmogonists with how the Solar System formed. The interesting thing is that one-and-a-half centuries after Poe, they still can’t reach agreement on what happened in the nearest 5 light years of space.
What’s the problem? It turns out that there are a couple of competing explanations for why our neighbourhood is the shape it is, as well as several bizarre anomalies in the data. Cosmogonists know that the Solar System is essentially flat. With the exception of two tiny outliers, Mercury and Pluto, the orbits of all the other planets lie in very nearly the same plane. And most cosmogonists agree that this is because the planets themselves formed from a nebular(星云状的)disc orbiting the early Sun, which had itself coalesced out of the same cloud of gas and dust.
But there’s a catch. If the planets and the Sun came from the same nebular disc, then the Sun’s equator should lie in the planetary plane. It doesn’t. The Sun leans over at an angle of 7.25° The majority of cosmogonists insist that the angle is so close to zero that it really doesn’t matter. Anyway, they add, the Sun has been losing mass for most of its life, and may have slipped a little.
The remaining minority aren’t having this. How can 7.25° be the same as zero? The Sun and the planets did come from cosmic dust, they say, but not from the same cloud of material. The Sun took shape somewhere in the Galaxy. Then it sailed along and picked up the planets—or perhaps the gas and dust that gave birth to them—elsewhere.
Is a tilting Sun the cosmogonists’ only headache? Not at all. It’s also hard to agree on how the outer planets formed. Far out in the nebular disc, matter would have been so spread out that it couldn’t quickly have dumped together. Some suggest planet-sized gravitational instabilities, others can find no reason for Uranus and Neptune to have formed yet.
The closer you get to home, it seems, the deeper the mysteries.
A cosmologist differs from a cosmogonist in that ______.
选项
A、he sounds a bit old-fashioned
B、he learns from Edgar Allen Poe
C、he studies the origin of the whole Universe
D、he tries to explain how the Solar System formed
答案
C
解析
具体细节题。见第2段第3句:Cosmologists worry about where the Universe came from,cosmogonists with how the Solar System formed.
转载请注明原文地址:https://kaotiyun.com/show/ijmi777K
0
在职申硕(同等学力)英语
相关试题推荐
Courageouspeoplethinkquicklyandactwithouthesitation.
IfyoureadCanadianEnglishDictionaries,youAcertainlyfindbothAmericanandBritishspellingsBlisting,andthefirstword
Visualimpairment(视觉障碍)carrieswithitareducedorrestrictedabilitytotravelthroughone’sphysicalandsocialenvironmentu
Desperatelyshortoflivingspaceanddangerouslypronetoflooding,theNetherlandsplanstostartbuildinghomes,businessesa
Thereis(fewevidence)thatchildren(inlanguageclassrooms)learnforeignlanguages(anybetter)thanadultsinsimilar(clas
Thestatementwasanallusiontorecenttroubleswiththeagency’scomputers.
Hiddenhotelcostscanbeasourceoffrustrationtothefrugaltraveler.
______allofuswhoareheretonight,IwouldliketothankMr.Johnsonforhisinformativetalk.
EveryoneintheclassknowsthatPeterisalways______forappointments.
A.professionalB.asC.writingA.reachtheirpersonaland【T1】______goalsB.hastrouble【T2】______C.aslow-tech【T3】_
随机试题
Amongtheraftofbooks,articles,jokes,romanticcomedies,self-helpguidesandotherwritingsdiscussingmarriage,somefamil
女性,28岁,尿频、尿急、尿痛、小腹痛伴终末血尿2天,尿常规见许多红、白细胞/HP。
A.胸膜炎B.呼吸道感染C.肺结核D.支气管哮喘E.喉部疾病咳嗽伴哮鸣音见于
甲电视台获得2006年德国世界杯足球赛A队与B队比赛的现场直播权。乙电视台未经许可将甲电视台播放的比赛实况予以转播,丙电视台未经许可将乙电视台转播的实况比赛录制在音像载体以上,备将来播放,丁某未经许可将丙电视台录制的该节目复制一份供其儿子观看。下列哪种说法
真空中,点电荷q1和q2的空间位置如图所示。若q1为正电荷,且q2=-q1,则A点的电场强度的方向是()。
针对企业短期贷款,商业银行对其现金流量的分析应侧重于()。
假设我国某商业银行2020年年末的有关指标如下:贷款余额2万亿元,其中,不良贷款余额240亿元;资本净额800亿元;最大一家客户贷款总额为60亿元;全部关联客户授信为150亿元;贷款损失准备为360亿元。根据上述材料,回答下列问题:该商业银行的拨备覆
如图,在Rt△ABC中,∠C=90°,AC=6,BC=8,动点P由起点A沿边AB向终点B运动,每秒2个单位,动点Q由起点B沿边BC向终点C运动,每秒1个单位,P、Q两点同时由起点开始运动,记运动时间为t秒。(1)△BPQ的面积为S,求S的最大值
某市提出高考改革,在原来的学术型考试的原则下增加技能型考试,推出高考考试技能型和学术型两种模式。你对增加的这种技能型考试怎么看?
1936年12月12日,张学良、杨虎城发动了西安事变,扣押蒋介石。中国共产党从民族大义出发,为了团结国民党共同抗日,确定促成事变和平解决的基本方针,史称“西安事变”。关于“西安事变”,下列说法正确的有()
最新回复
(
0
)