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
Lunar sight-seeing trips and orbiting space hotels are within reach, moon walking astronaut Edwin"Buzz" Aldrin said last week, b
Lunar sight-seeing trips and orbiting space hotels are within reach, moon walking astronaut Edwin"Buzz" Aldrin said last week, b
admin
2010-01-18
54
问题
Lunar sight-seeing trips and orbiting space hotels are within reach, moon walking astronaut Edwin"Buzz" Aldrin said last week, but some who favor space tourism worried about its "giggle factor". Astronomers have known for years that a source of intense energy emissions lies at the center of the Milky Way Galaxy, obscured from view by vast clouds of dust and gas. In February, 1992, researchers at the Max Planck Institute in Garching, Germany, reported evidence that the mysterious energy source is a gigantic black hole.
Observations have shown that many strong energy sources lie at the heart of the Milky Way. One of them, called Sagittarius A, is thought to be the actual center of the Galaxy, the point about which the great spiral of stars rotates. Sagittarius A is a powerful emitter of radio waves and X-rays.
Astronomers have considered two possible explanations for the identity of Sagittarius A. They theorized that it is either a compact duster of normal stars or a super-massive black hole containing as much as a million or more suns. The German scientists reported that they found strong evidence in support of the black hole explanation.
The astronomers used a new telescope high in the Andes Mountains of Chile to obtain the sharpest images ever made of the region around Sagittarius A. The image shows that Sagittarius A is a single, small object rather than a duster of stars.
The researchers also found that a bubble of gas is expanding outward from Sagittarius A. This expanding gas is similar in temperate, density, and composition to the jets of gas that astronomers have observed flow hag away from the centers of many other galaxies. Such jets are thought to be generated by accretion disks surrounding enormous black holes. Accretion disks are vast, swirling masses of gas and dust that give off titanic amounts of energy as they are sucked into the black hole. The similarity between the jets emitted by some galaxies and the gas bubble surrounding Sagittarius A supports the idea that Sagittarius A is a super-massive black hole.
It may be inferred from the passage that jets of gas ______.
选项
A、around Sagittarius A were found quite unexpectedly
B、are common phenomena surrounding enormous black holes
C、only flow away from the centers of galaxies
D、are the true source of intense energy
答案
B
解析
根据文章第五段第二和第三句话“This expanding gas is similar in temperature,density,and com position to the jets of gas that astronomers have observed flowing away from the centers of many other galaxies.Such jets are thought to be generated by accretion disks surrounding enormous black holes,”可以推断出[B]为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/PTvO777K
0
专业英语八级
相关试题推荐
What’sthemainideaofthepassage?
Whyarewarriorscapableofworkingtogether,althoughtheylikefightingwitheachother?
WhichofthefollowingisNOTtrueaccordingtothepassage?
调查者发现每天散步有利于睡眠质量。他们同时也提出只有早上锻炼才对晚上睡觉有利。那些晚上锻炼的人实际上有更多的睡眠问题。一个可能的解释是晚上和早上锻炼相比会影响睡眠质量。早上锻炼可能会让生命钟变得有序,而晚上锻炼则会打乱这种秩序。但是还需要更多的调查来证实这
A、Idon’tthinkweshouldopenourlocalbranchhereinShanghai.B、IcannotappointMr.Browntothepostalthoughhewasborn
Whenprehistoricmanarrivedinnewpartsoftheworld,somethingstrangehappenedtothelargeanimals:theysuddenlybecameex
Thinkgolfis【C1】______game?Thinkagain.ResearchersincludingDebbieCrewsofArizonaStateUniversityandJohnMiltonofthe
A、Lindaenjoysdoingapart-timejobbecauseitbringsheralotofmoney.B、Lindaspendssomuchtimeonherpart-timejobthat
Inthe1950s,thepioneersofartificialintelligence(AI)predictedthat,bytheendofthiscentury,computerswouldbeconver
SocialpsychologydevelopedintheUSAWhobelievedthatmancaninfluencesocialchangeforthegoodofsociety?
随机试题
2011年3月至5月,甲上市公司发生的交易性金融资产业务如下:(1)3月2日,购入A上市公司股票100万股,每股6元,另发生相关的交易费用2万元,并将该股票划分为交易性金融资产。(2)3月31日,该股票在证券交易所的收盘价格为每股5.70元。(3)4
下列有关神经-骨骼肌接头处的兴奋传递特点,错误的是()
亚急性感染性心内膜炎抗菌治疗原则为
钻孔灌注桩灌注水下混凝土时,导管底端至孔底的距离最短不能小于()。
无效合同、可撤销合同的确认应由()裁定。
某汽车制造企业为增值税一般纳税人,生产销售小汽车(消费税税率为5%),每辆不含税销售价格统一为10万元,2016年5月发生如下业务:(1)与某特约经销商签订了40辆小汽车的平销返利协议,协议规定该小汽车制造企业按含税销售额的5%支付返利并由经销商开具普通
学过高等数学后有利于初等数学的进一步理解和掌握,这属于()。
公安行政执法必须严格划分违反治安管理行为与犯罪的界限,为此需把握的违反治安管理行为的特征是()。
计算机软件包括
Becauseoftheeconomicslump,thereareonly______onthebeachasbefore.
最新回复
(
0
)