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
60
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://jikaoti.com/ti/jWgjFFFM
0
在职申硕(同等学力)英语
相关试题推荐
A.Gilbert综合征B.无效造血C.Dubin-Johnson综合征D.Crigler-Najjar综合征E.Rotor综合征胆红素生成过多见于
Themediacanimpactcurrentevents.AsagraduatestudentatBerkeleyinthe1960s,Irememberexperiencingtheeventsrelated
Anintimateand______knowledgeofhowyouaredoinginthecustomer’seyesiscritical.
(Thefirst)electriclamphadtwocarbonrods(fromwhich)vapor(served)toconductthecurrent(across)thegap.
Whatisimpliedby"theyoungeronesaresurroundedbymorechildren’slanguageonaveragethantheolderkids"(Para.3)?Whic
Whatisimpliedby"theyoungeronesaresurroundedbymorechildren’slanguageonaveragethantheolderkids"(Para.3)?What
TheVikingshaveleftmanytracesoftheirsettlementwhicharestillvisibletoday.Archaeologyprovidesphysicalevidenceoft
Wehadanunusuallyheavyrainfallduetothetyphoon,andforawhile,trafficbecameparalyzed.
Everyyeartelevisionstationsreceivehundredsofcomplaintsabouttheloudnessofadvertisements.However,federalrulesforbi
随机试题
Windows2000中在几个任务间切换可用热键
Hisdebtshadtobe______afterhecommittedsuicidewithhisrifle.
葡萄胎避孕方法宜选用
《医疗事故处理条例》规定,医患双方不能确定患者死因或对死因有异议时,应在患者死亡后多长时间内进行尸检,或者具备尸体冻存条件的,可以延长至多少天
在技术交易程序中,卖者技术交易的首要程序是()。
某集团管理层做出了风险应对措施决策。下列各项中,正确的包括()。(2012年)
当可接受的检查风险降低时,注册会计师可能采取的措施是()。
书画的装裱是伴随着书画创作产生和发展的一种特殊的工艺。至迟在两晋时代,书画装裱进入初创时期,在选材、样式及技法上还并不完善。南北朝时,书画装裱有了初步的发展,产生了卷轴这种装裱样式。唐代,以人物、山水、楼宇为题材的大幅绘画勃然兴起,书画装裱获得了
在下面各句横线处,依次填入最恰当的词语。①外表大大咧咧的她,其实内心里深藏着不为人知的丰富_____________的感情,②经过_____________的调查研究,这家公司最终选择上海作为中国市场切入点。③中国四大名绣之一
除斥期间是指法律规定的()存在的期间。
最新回复
(
0
)