首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
Black Holes 1 Black holes can be best described as a sort of vacuum, suckin...
Black Holes 1 Black holes can be best described as a sort of vacuum, suckin...
admin
2020-12-24
14
问题
Black Holes
1 Black holes can be best described as a sort of vacuum, sucking up everything in space. Scientists have discovered that black holes come from explosion of huge stars. Stars that are near death can no longer burn due to loss of fuel, and because its temperature can
no longer control the gravitational (重力的)force, hydrogen ends up putting pressure onto the star’s surface until it suddenly explode then collapses.
2 Black holes come from stars that are made of hydrogen, other gases and a few metals. When these explode it can turn into a stellar-mass (恒星质量) black hole, which can only occur if the star is large enough (should be bigger than the sun ) for the explosion to break it into pieces, and the gravity starts to compact every piece into the tiniest particle. Try to see and compare: if a star that’s ten times the size of the sun ends up being a black hole that’s no longer than 70 kilometers, then the Earth would become a black hole that’s only a fraction of an inch!
3 Objects that get sucked in a black hole will always remain there, never to break free. But remember that black holes can only gobble up (吞噬) objects within a specific distance to it. It’s possible for a large star near the sun to become a black hole, but the sun will continue to stay in place. Orbits (轨道) do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star, only this time its mass is totally contracted that it can end up as no bigger than a state.
4 So far, astronomers have figured out that black holes exist because of Albert Einstein’s theory of relativity. In the end, through numerous studies, they have discovered that black holes truly exist. Since black holes trap light and do not give off light, it is nearly impossible to detect black holes via a telescope. But astronomers continue to study galaxies (银河系), space and the solar system to understand how black holes might evolve. It is possible that black holes can exist for millions of years, and later contribute to a bigger process in galaxies, which can eventually lead to creation of new entities (实体). Scientists also credit black holes as helpful in learning how galaxies began to form.
A newly formed black hole and the star it comes from are of _____________
选项
A the tiniest particle
B a fraction of an inch
C the same amount of mass
D an explosion of huge stars
E the creation of new entities
F the existence of black holes
答案
C
解析
第三段第四句 "Orbits (轨道)do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star”,意思是“新形成的黑洞的轨道不会变,因为它的质量和它之前是恒星时的质量一样”。所以答案是C,“相同的质量”。
转载请注明原文地址:https://ti.zuoweng.com/ti/wr9QKKKQ
相关试题推荐
Thearticlesketchedthemajoreventsofthedecade.A:described B:offered C:ou
Thearticlesketchedthemajoreventsofthedecade.AdescribedBofferedCoutl
Thearticlesketchedthemajoreventsofthedecade.AdescribedBofferedCoutl
Thearticlesketchedthemajoreventsofthedecade.AdescribedBofferedCoutl
Thearticlesketchedthemajoreventsofthedecade.AdescribedBofferedCoutl
BlackHoles 1Blackholescanbebestdescribedasasortofvacuum,suckin...
BlackHoles 1Blackholescanbebestdescribedasasortofvacuum,suckin...
BlackHoles 1Blackholescanbebestdescribedasasortofvacuum,suckin...
BlackHoles 1Blackholescanbebestdescribedasasortofvacuum,suckin...
BlackHoles 1Blackholescanbebestdescribedasasortofvacuum,sucking...
随机试题
重症肌无力胆碱能危象是由于( )。 A、抗胆碱酯酶活性消失 B、抗胆碱酯酶
城市公共交通按其提供运输服务的性质可分为()。
《国务院关于大力推进信息化发展和切实保障信息安全的若干意见》明确了到“十二五”
28岁初产妇,妊娠40周,规律宫缩6小时.血压110/70mmHg,骨盆不小
某一城市的A开发企业开发一项房地产项目,该项目的现金流量情况如下表。假设开发
患者男,35岁,因失眠,乏力,少语入院。 针对患者的首要心理护理是
1998年设立的某包装厂含二甲苯废气的排气筒高12m,《大气污染物综合排放标准》
体内脂肪酸合成的主要原料是 ANADPH和乙酰CoA BNADH和乙酰
心前区疼痛呈压榨样并有窒息感常见于A.输尿管结石B.十二指肠溃疡C.急性胆囊炎D.心绞痛E.颅内压增高
甲公司以成本模式对投资性房地产进行后续计量,2016年至2018年发生如下与投资性房地产有关的业务: (1)2016年1月1日将一项自用厂房用于出租,租...