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
Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars w
Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars w
admin
2020-09-28
15
问题
Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars would not be expected to persist in ancient star clusters.
Some researchers believe that the typical blue stragglers formed when two ancient, lower-mass stars collide and merge form more massive, hotter star.
Peter Leonard theorizes alternatively that in low density globular clusters, where mergers between single stars occur too infrequently to account for the observed quantity of blue stragglers, these stragglers are created instead by a group of stars. He suggests that a pair of stars already orbiting each other presents a
larger target
for a third star or another pair. Once this new grouping forms, close encounters between the stars could prompt any two to merge as a blue straggler. Leonard’s model predicts that each blue straggler has a distant orbiting companion—as appears true of many blue stragglers in the M67 cluster of the Milky Way galaxy.
The reference to a “larger target” serves primarily to suggest why a
选项
A、blue straggler would be more likely to collide and merge with another star than would be a lower-mass star
B、pair of stars would be more likely to encounter other stars than would the typical blue straggler
C、pair of stars would be more likely to interact with other stars than would a single star
D、blue straggler would be more likely to interact with a pair of stars than it would with a third star
E、third star would be more likely to encounter a pair than it would to encounter a blue straggler
答案
C
解析
“更大的目标”就是为了说明成对的恒星比单颗恒星更有可能发生撞击,因此选项C正确。A、B、D、E:根据原文,蓝色离散星是撞击之后的结果,选项A、B、D、E全都在说蓝色离散星会和其他恒星发生碰撞,因此错误。
转载请注明原文地址:https://kaotiyun.com/show/ShVO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
ArealestatedeveloperinFlorida,desiringtoprotecthishigh-riseapartmentbuildingonthebeachfromhurricanedamage,has
Australianresearchershavediscoveredelectroreceptors(sensoryorgansdesignedtorespondtoelectricalfields)clusteredatthe
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,someofwhichareunavoidable.Overstocksmayaccum
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,someepidemicsarecausedbybacteriaandvirusesthat
MannisCorporation’sarchivalrecordsarestoredinanobsoleteformatthatisaccessibleonlybyitscurrentcomputersystem;t
Itisverydifficulttoprovetodaythatapaintingdonetwoorthreehundredyearsago,especiallyonewithoutasignatureorw
21.Theprogramtocontroltheentryofillegaldrugsintothecountrywasafailurein19Iftheprogramhadbeensuccessful,t
HistoriansofNorthAmericanarchitecturewhohavestudiedearlynineteenth-centuryhouseswithwoodenfloorshaveobservedthat
Variabilityinindividualphysicaltraitsbotharedeterminedthroughgeneticfactors,environmentalfactors,andinteractionbe
随机试题
教学、培训工作的基本环节有几条?
X线胸片透亮增强,肺纹理增粗,膈肌降低,肋骨走向变平,肋间隙增宽。时间肺活量降低,残气量增加。肺有散在湿啰音,考虑以下哪种病()
胎头最小径线是:
属于气体灭菌剂的是
下列关于融资租赁的特点的说法中,正确的是()。
在键盘上的功能键Ctrl表示()键。
持有上市公司股60%以上股份的股东拥有上市公司控制权。()
人们所说的“耄耋”是指()岁。
近代上海开埠以后,城市急剧扩大,人口迅速膨胀,形成了清朝县衙、外国租界、青红帮会“三分天下”的格局,但是同样开埠的广州却没有此类情况。对此解释正确的是()。
CPI是居民消费价格指数(consumerpriceindex)的简称,可以反映居民购买消费品及服务的价格变动。它不但与人们的生活密切相关,在国家的价格体系中也占有很重要的地位。中国的CPI涵盖居民生活中所消费的食品、服装、医疗和教育等8大类、262种
最新回复
(
0
)