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
104
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
Anthropologyisthestudyofhumanbeingsascreaturesofsociety.Itfastensitsattentionuponthosephysicalcharacteristics
(Following)thefoundationofnewuniversitiesat(suchas)placesasYorkandLancaster,(hopes)forauniversityatStamfordr
Theirbusinessflourishedatitsnewlocationayearlaterowingtotheirjointeffortsandhardwork.
Customers(areasked)toensurethatthey(havegiven)correctchangebefore(leaving)theshopasmistakescannotbe(afterward
Whywasthehydraulicfuelpumpsealimportantforthespaceshuttle?ThegreatsignificanceofVoss’sfindingsliesin______.
Inmodemsocietypeoplearefacedwithfiercecompetition,andthepressurehasbecomegreatertheneverbefore...(具有挑战性的工作职位:
Evidenceexiststhathearingproblemsmaybealleviatedbychangesindietandexercisehabits.
Thescientists,(concernedabout)thepotentialhazards,demanded(thelatest)researchfinding(made)(publicly).
MargheritaisaLondongirlandarrivingatCapitalwaslikecominghome."IgrewuplisteningtoCapitalRadio,"shesays.Peop
随机试题
亚浅海相的层理以()层理为主。
生存链的环节有()
行业的盈利能力由哪些力量决定
下列哪项不属于五迟五软的病因
A、氟他胺B、米菲司酮C、炔诺酮D、非那雄胺E、炔雌醇为孕激素拮抗剂,临床用于抗早孕
桥梁墩台加高方法中,垫高支座是利用行车空隙或封锁时间,将桥梁连同支座顶起至设计标高.在支座下设U形模板,由开口一侧填塞(),充分捣实达到需要强度后恢复通车。
事前监督是指监督主体在公安机关及其人民警察实施执法行为之前依法进行监督。()
刑法第133条规定:“违反交通运输管理法规,因而发生重大事故,致人重伤、死亡或者使公私财产遭受重大损失的,处三年以下有期徒刑或者拘役;交通运输肇事后逃逸或者有其他特别恶劣情节的,处三年以上七年以下有期徒刑;因逃逸致人死亡的,处七年以上有期徒刑。”试
Olderpeoplemustbegivenmorechancestolearniftheyaretocontributetosocietyratherthanbeafinancialburden,accordi
软件管理包括很多职能,其中对整个软件生命周期的安排和执行、工作量的估算和分配以及具体的进度安排属于
最新回复
(
0
)