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
They were by far, the largest and most distant objects that scientists had ever detected: a strip of enormous cosmic clouds some
They were by far, the largest and most distant objects that scientists had ever detected: a strip of enormous cosmic clouds some
admin
2010-07-06
97
问题
They were by far, the largest and most distant objects that scientists had ever detected: a strip of enormous cosmic clouds some 15 billion light-years from earth. 61)
But even more important, it was the farthest those scientists had been able to looks into the past , for what they were seeing were the patterns and structures that existed 15 billion years ago.
That was just about the moment that the universe was born. What the researchers found was at once both amazing and expected: the US National Aeronautics and Space Administrations Cosmic Background Explorer satellite (COBE) had discovered landmark evidence that the universe did in fact begin with the primeval explosion that has become known as the Big Bang (the theory that the universe originated in an explosion from a single mass of energy).
62)
Tile existence of the giant clouds was virtually required for the Big Bang, first put forward in the 1920s, to maintain its reign as the dominant explanation of the cosmos.
According to the theory, the universe burst into being as a submicroscopic, unimaginably dense knot of pure energy that flew outward in all directions, emitting radiation as it went, condensing in to particles and then into atoms of gas. Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.
COBE is designed to see just the biggest structures, but astronomers world like to see much smaller hot spots as well, the seeds of local objects like clusters and superclusters of galaxies. They shouldn’t have long to wait. 63)
Astrophysicists working with ground-based detectors at the South Pole and balloon-borne instruments are closing in on such structures, and may report their findings soon.
64)
If the small hot spots look as expected, that will be a triumph for yet another scientific idea, a refinement of the Big Bang called the inflationary universe theory.
Inflation says that very early on, the universe expanded in size by more than a trillion fold in much less than a second, propelled by a sort of antigravity. 65 )
Odd though it sounds, cosmic inflation is a scientifically plausible con- sequence of some respected ideas in elementary-particle physics, and many astrophysicists have been convinced for the better part of a decade that it is true.
选项
答案
宇宙膨胀说虽然听似奇特,但它是基本粒子物理学中一些公认的理论在科学上看来可信的推论。许多天体物理学家七、八年来一直认为这一论说是正确的。
解析
转载请注明原文地址:https://kaotiyun.com/show/P0Dd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】________peoplegetold
Whatisthemainresponsibilityofthe,UnitedNationsPopulationFundaccordingtothepassage?
WhoseinterestsdoestheCouncilofMinistersrepresent?
Whatdowomen’sliberationgroupsinBritaindowithgraffiti?
Themoretimescientistsspenddesigningcomputers,themoretheymarvelatthehumanbrain.Tasksthatstumpthemostadvanced
LiketheotherpartsofChina,Tianjinhasmaderapidprogressafterliberation,yetsomesaythatTianjinhasnotseenmuchimp
Predictionsofmanyrobotsinindustryhaveyetcometrue.Fortenyearsormore,manufacturersofbigrobotshaveexplainedhow
FormanygiventaskinBritaintherearemorementhanareneeded.Strongunionskeepthemthere.InFleetStreet,homeofsome
Wheredoesthisdialoguetakeplace?Ata______.
retired.
随机试题
Boilerroomsareoftendirtyandsteamy,butthisoneispristine(干净的)andcool.FoxPointisaspankingnew47-unit【C1】_______
______hisappearance,hecomesfromawell-offfamily.
冲脉交会任脉交会
下列哪项是修建性详细规划针对的地区()
会计科目是对会计对象的具体内容进行初始分类的标志,报表会计要素是对会计对象的具体内容进行终结分类的标志。()
本例中的加工贸易合同,在进口前应向海关办理的备案手续是______。加工贸易合同履行完毕后,经营单位应该持哪些单证到大连海关办理合同核销手续______。
《合同法》规定,自债务人的行为发生之日起( )年内,债权人没有依法行使撤销权的,该撤销权消灭。
当组织人力资源出现结构性失衡时,正确的供需平衡方法是()。
[2014年12月]已知M=(an+…+an—1)(a2+…+an),N=(an+…+an)(a2+…+an—1),则M>N。(1)a1>0;(2)a1an>0。
[x]表示不超过x的最大整数,试确定常数a的值,使存在,并求出此极限.
最新回复
(
0
)