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
Black Holes 1. Black holes can be best described as a sort of vacuum, sucking up everything in space. Scientists have discov
Black Holes 1. Black holes can be best described as a sort of vacuum, sucking up everything in space. Scientists have discov
admin
2014-02-28
70
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 an 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 explodes 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 end up being a black hole that’s no longer than 70 kilometers, then the Earth would become 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 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 not possible to detect black holes via a telescope. But astronomers continue to explore 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 further process in galaxies, which can eventually lead to creation of new entities. Scientists also credit black holes as helpful in learning how galaxies began to form.
A. What are black holes made of?
B. Is there proof that black holes really exist?
C. How were black holes named?
D. How are black holes formed?
E. What are different types of black holes?
F. What happens to the objects around a black hole?
Paragraph 3______.
选项
答案
F
解析
第三段讲到黑洞吞噬的物体会永远在那里,永远无法挣脱。太阳附近的一颗大恒星有可能变成黑洞,但是太阳永远不会被吞噬。所以第三段主要讲了黑洞附近的物质会出现什么情况。
转载请注明原文地址:https://kaotiyun.com/show/tpQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclo
ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclo
MedicineAwardKicksoffNobelPrizeAnnouncementsTwoscientistswhohavewonpraiseforresearchintothegrowthofcancer
HowTwoGreatConflictsHelpedtoChangeEuropeNinetyyearsagoonasunnymorninginNorthernFrance,somethinghappenedt
A.ColorfulLifeonCampusB.IntelligentStudentBodyC.ExcellentAdministrationD.DistinguishedFacultyE.SubstantialFinancial
ThetwoboysinChicagowere______.Accordingtopoliticians,whenchildrencommitcrimes,theyshouldbetreatedinthesame
Sheseemedtohavedetectedsomeangerinhisvoice.
Shegetsaggressivewhensheisdrunk.
HenryManleywasalreadydeeplyindebt.ThejobthathadbeenofferedtoGeorgeinBirminghampaidbetter.
Shegetsaggressivewhensheisdrunk.
随机试题
鼻咽部横断面CT扫描的体位与基线是
如下有关感冒论述正确的是
下列哪项不符合ARDS的诊断标准
药物经济学研究的初级服务对象包括
个人经营贷款的合作机构主要是()
劳动力市场是一种()。
某工厂一车间人数占全厂人数的25%,二车间人数比一车间人数少,三车间人数比二车间人数多,三车间是156人。这个工厂共有多少人?()
社会保障制度是指在政府的管理之下,按照一定的法律和规定,通过国民收入的再分配,以社会保障基金为依托,为保障人民生活提供物质帮助和服务的社会安全制度。下列属于社会保障制度范围内的一项是()。
有“明清古建筑博物馆”之称的三坊七巷街区,有人将其比喻为鱼骨与鱼刺,有人则形容为菩提树叶,或直呼为“非”字形。笔者觉得,它倒更像一片优美的棕榈树枝叶,南后街似叶片的主脉,向西伸出的三条支脉为三坊,向东生出的七条细脉是七巷。由北向南的三坊依次为衣锦坊、光禄坊
WhySummerVacationWon’tMakeYouHappier?Fromaninformalandhighlyunscientificsurveyoffriendsandcolleagues,Ican
最新回复
(
0
)