首页
登录
职称英语
[originaltext] The existence of black hole had long been predicted by theory
[originaltext] The existence of black hole had long been predicted by theory
游客
2024-06-04
22
管理
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、About 700 million light-years from Sun.
B、About 700 million light-years from Earth.
C、About 700 million light-years from the black hole.
D、About 700 million light-years from a galaxy.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3618774.html
相关试题推荐
[originaltext]"ButIjustpaid$1.69forthisbottleofwinelastweek.How
[originaltext]"ButIjustpaid$1.69forthisbottleofwinelastweek.How
[originaltext]"ButIjustpaid$1.69forthisbottleofwinelastweek.How
[originaltext]EachdayeverypersonintheUnitedStatesthrowsawaymoret
[originaltext]EachdayeverypersonintheUnitedStatesthrowsawaymoret
[originaltext]W:Look,Idon’twanttobeanuisance,butI’mafraidI’mnotha
[originaltext]W:Look,Idon’twanttobeanuisance,butI’mafraidI’mnotha
[originaltext]W:Look,Idon’twanttobeanuisance,butI’mafraidI’mnotha
[originaltext]M:I’vedinedinseveralChineserestaurantsintheU.S,butIwo
[originaltext]M:I’vedinedinseveralChineserestaurantsintheU.S,butIwo
随机试题
Suchcrimesmaybesocomplexthatmonthsoryearsgobybeforeanyone______th
LifeBeginsat100[A]Thisyear,thenumberofpensioner
金属结构闸门安装完毕后,承包人应会同监理机构对闸门进行相关项目的试验和检查,(
在经济繁荣时期,随之扩张;经济衰退时期,随之低迷的行业属于()。A.增长型
下列医学伦理学原则应除外A.不伤害 B.公正 C.克己 D.尊重 E.有
血压的负反馈调节 1.题目︰苏教版必修三《血压的负反馈调节》片段教学 2.内
A.0~1% B.20%~40% C.3%~8% D.0.5%~5% E
Thechangeinthatvillagewasmiraculou
企业发行企业债券必须符合的条件是()。A:企业规模达到国家规定的要求 B:企
某开发公司投资兴建住宅楼工程,建筑面积12000m2,框架结构。经公开招投标,甲
最新回复
(
0
)