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
A、Gases have been heated to a temperature of multimillion-degree. B、Gases have been drawn to the black hole at a very high speed
A、Gases have been heated to a temperature of multimillion-degree. B、Gases have been drawn to the black hole at a very high speed
admin
2010-08-21
38
问题
The existence of black hole had long been predicted by theory but never confirmed.
A black hole is an extremely mysterious object. It has a gravity which is so intense that nothing, not even light, can escape from it. It can change space and time in basic ways.
A powerful X-ray stream drew the attention of scientists to the event. It is located near the center of a galaxy which is about 700 million light-years from Earth. According to the international team of scientists, gases from the star have been heated to a temperature of multimillion-degree when they were drawn toward the black hole. Thus a strong wind is produced.
Scientists said a star about the size of our sun was coming close to the black hole. The big gravity of the black hole pulled the star to the point of breaking. It is estimated to have a gravity 100 million times that of our sun.
The effect is similar to the dragging force the moon has on the Earth’s oceans, but is much more violent. The black hole has observed to have eaten up about 1 percent of the star. It seems that this unlucky star has just entered the wrong neighborhood.
Scientists have seen other similar X-ray streams before, but never were able to locate them at the center of a galaxy, where black holes may exist. The new observations also found that a black hole is always surrounded by X-rays.
选项
A、Gases have been heated to a temperature of multimillion-degree.
B、Gases have been drawn to the black hole at a very high speed.
C、Gases have been tearing apart by the black hole.
D、Gases have been sucked by the black hole.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/Oj7K777K
0
大学英语六级
相关试题推荐
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气式飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Ithasbeenknownsinceancienttimesthatcertainplantsregularlyopentheirleavesindaytimeandclosethematnight.Itwas
A、Becausetheyworshippigsbestofall.B、Becausetheyconsiderpigsasbadanimals.C、Becausetheyaren’tusedtotalkingabou
Theyear2005isthemidpointofadecadethatspansthreeunique,importanttransitioninthehistoryofhumankind.
A、Becausetheywantedtobuildstoreshere.B、Becausetheythoughttheplacewasbeautiful.C、Becausetheyrealizedthatitwas
A、Itisacityofcontrasts.B、Itpossessesmanyhistoricalsites.C、Itisanimportantindustrialcenter.D、Ithasmanybigand
TheCulturalPatterningofSpaceLiketime,spaceisperceiveddifferentlyindifferentcultures.Spatialconsciousnessinm
Sixteen-year-oldMichaelViscardiofSanDiegowonfirst【B1】_______intheSiemensWestinghouseCompetitioninMath,Scienceand
Sixteen-year-oldMichaelViscardiofSanDiegowonfirst【B1】_______intheSiemensWestinghouseCompetitioninMath,Scienceand
随机试题
预防医学是研究外界环境因素与
实现政策目标和有效性的基础是
急性阑尾炎早期腹痛尚未转移至右下腹时,具有诊断意义的体征是
不能产生避孕效果的是
A.禁忌证B.新药信息C.药品不良反应D.药物相互作用E.合理用药信息告知“人促红细胞生成素可引起纯红细胞再生障碍性贫血”属于()。
某城市隧道工程项目,采用喷锚暗挖法施工,该工程施工项目部针对工程的特点,在施工组织设计的每一个环节抓住其关键,做出了最恰当的安排,并选择了合理有效的措施。在施工过程中,喷锚暗挖加固支护的方法采用小导管注浆措施,小导管注浆采用石灰砂浆,并充满钢管及周围空隙,
在万能寿险中,保单持有人在缴纳了一定量的首期保险费后,可以按照自己的意愿选择任何时候缴纳任何数量的保险费。那么,保单持有人享有这种权利的前提条件是()。
下列可以成为个人独资企业投资人的是()。
导游人员是指依照《导游人员管理条例》的规定取得导游证,接受旅行社委派,为旅游者提供向导及相关旅游服务的。()
检索有职工的工资大于或等于“WH1”仓库中所有职工“工资”的仓库号,正确的命令是( )。检索至少有一名职工信息的“仓库号”及仓库的“所在地”和“人数”,正确的SQL命令是( )。
最新回复
(
0
)