首页
登录
职称英语
Hotter and more massive than the Sun, stars called “stragglers” are puzzling
Hotter and more massive than the Sun, stars called “stragglers” are puzzling
游客
2024-01-10
23
管理
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. [br] The passage cites which of the following as evidence undermining the theory presented in the second sentence?
选项
A、A discrepancy between the number of mergers between single stars in certain low-density globular clusters and that in other low-density globular clusters
B、A discrepancy between the heat and mass of blue stragglers formed by one type of process and the heat and mass of blue stragglers formed by another type of process
C、A discrepancy between the frequency of star mergers in low-density globular clusters and those in high-density globular clusters
D、A discrepancy between the amount of heat and mass of ancient single stars and that of blue stragglers
E、A discrepancy between the number of mergers between single stars in certain star clusters and the number of blue stragglers in those clusters
答案
E
解析
本题考查对老观点的批判原理。老观点被反驳的原因就是理论推断出的蓝色离散星的数量和实际观察到的蓝色离散星数量不符,因此选项E正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3349645.html
相关试题推荐
Caffeine,thestimulantincoffee,hasbeencalled"themostwidelyusedpsy
Caffeine,thestimulantincoffee,hasbeencalled"themostwidelyusedpsy
Caffeine,thestimulantincoffee,hasbeencalled"themostwidelyusedpsy
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
So-calledenvironmentalistshavearguedthattheproposedGoldenLakeDevelopmen
Caterpillarsoffallspeciesproduceanidenticalhormonecalled"juvenilehormo
随机试题
____________(由你决定)whetherweacceptthetaskornot.It’suptoyoutodecide
[originaltext]Terry:Wellwhathavewegotthismorning?ThefirstthingIthin
错图中在高速公路牵引故障车应在最右侧车道上行驶。
根据《招标投标法实施条例》,招标人具有编制招标文件和组织评标能力是指()。A
为截留汽车洗车污水中的油类,污水在隔油沉砂池中停留时间为()mⅠn。A.1.
为达到国家规定的排放标准,铸造化铁用冲天炉除尘设计采用了带高温烟气冷却装置的旋风
治疗深部真菌感染的首选药是A.两性霉素B. B.灰黄霉素 C.咪康唑 D.
王老师在进行思想品德教育时,让学生谈谈如何合理正确地使用网络。学生们探讨得很激烈
噬神经细胞现象是指 A.少突胶质细胞围绕变性神经细胞B.小胶质细胞吞噬变性神
下列各项中,属于会计职业道德的构成要素有()。A.会计职业理想 B.会计职
最新回复
(
0
)