首页
登录
职称英语
The recently announced discovery of the first known planet orbiting a pulsar
The recently announced discovery of the first known planet orbiting a pulsar
游客
2024-01-10
19
管理
问题
The recently announced discovery of the first known planet orbiting a pulsar (the ultradense, pulsating remnant off the supernova explosion of a star) turned out to be based on faulty data. Had this discovery been confirmed, theorists would have had difficulty accounting for the existence of such a planet. The supernova would certainly have destroyed any preexisting planets. This particular pulsar is relatively young, allowing little time for a new planet to have coalesced, and it rotates relatively slowly, implying that it has not interacted with any nearby star since the supernova.
But newer evidence of a different pulsar with planets is more promising. This is a rapidly spurring “millisecond pulsar" thought to be a much older object that has pulled gaseous material from a stellar neighbor, causing its rotational speed to increase. Leftover, unconsumed gas around such a pulsar could, in theory, coalesce into planets. Or the pulsar’s radiation might have vaporized a companion star, providing new material for planetary formation. [br] Which of the following can be inferred regarding the pulsar discussed in the first paragraph?
选项
A、Theorists initially doubted its existence.
B、If its existence had been confirmed, astronomers would have turned their attention to the pulsar discussed in the second paragraph.
C、If the supernovas explosions that created it had been more powerful the resulting radiation would have preceded the subsequent formation of a planet.
D、If it had interacted with a nearby star since the supernova explosion, it would rotate faster than it does.
E、Astronomers’ interest in it ultimately led to a new theory of planetary formation.
答案
D
解析
根据第一段第四句的it rotates relatively slowly,implying that it has not interacted with any nearby star since the supernova可以推测出,如果脉冲星和周围恒星发生相互作用,就会转得更快。A项脉冲星的存在是客观事实,没人质疑这一点,A项质疑的是脉冲星附近的行星。B项文中未提及。C项根据第二段,脉冲星的辐射会促使行星的形成,而非超新星的辐射。E项行星形成的理论和天文学家的兴趣无关。
转载请注明原文地址:https://tihaiku.com/zcyy/3349559.html
相关试题推荐
Althoughthediscoveryofantibioticsledtogreatadvancesinclinicalpractice
Intheearlytwentiethcentury,thediscoveryofradium(i)____thepopularimag
Theimpactofarecentlypublishedcollectionofessays,writtenduringandabou
Withinthenextdecade,sophisticatedtelescopesnoworbitingtheEarthwilldet
ItispuzzlingtoobservethatJones’snovelhasrecentlybeencriticizedforit
Untilquiterecentlyresearchondiabeteshad,asakindofholdingaction,atte
Astronomerswhostudyplanetformationoncebelievedthatcomets—becausethe
Astronomerswhostudyplanetformationoncebelievedthatcomets—becausethe
Somehistorianshaverecentlychallengedthe“partyperiodparadigm,”thevi
Somehistorianshaverecentlychallengedthe“partyperiodparadigm,”thevi
随机试题
Janewasdeterminedto______herselfintheAfricanwayoflife.A、immerseB、dip
在设备采购合同中,因买受人原因致使设备不能按照约定期限交付的,买受人应当自(
技术方案产生不确定性因素的原因很多,关于不确定性因素产生的原因,下列选项错误的是
A.真溶液B.胶体溶液C.乳剂D.混悬液E.半固体剂型高分子化合物分散于液体分散
钢强度不高,塑性、韧性、加工性能与焊接性能好,主要用于轧制薄板和盘条等。此为(
支付令具有的特征是()。A.强制性 B.非强制性 C.保密性 D.非保密
概念所包含的事物的本质属性称为概念的()。 (A)含义(B)内涵 (C)
A.胶体果胶铋 B.胃蛋白酶 C.奥美拉唑 D.莫沙必利 E.还原型谷胱
土工膜袋护坡的侧翼宜设()。A.护脚棱体 B.压袋沟 C.排水管 D
在工裎量清单包含的内容中,()是工程量清单的核心。 A.零星工作项目表B.
最新回复
(
0
)