首页
登录
职称英语
共用题干 So Many"Earths"The Milky Way(银河)co
共用题干 So Many"Earths"The Milky Way(银河)co
练习题库
2022-08-02
24
问题
共用题干So Many"Earths"
The Milky Way(银河)contains billions of Earth-sized planets that could support life.That's the finding of a new study.It draws on data that came from NASA's top planet-hunting telescope.
A mechanical failure recently put that Kepler space telescope out of service.Kepler had played a big role in creating a census of planets orbiting some 170,000 stars.Its data have been helping astronomers predict how common planets are in our galaxy.The telescope focused on hunting planets that might have conditions similar to those on Earth.
The authors of a study,published in The Proceedings of the National Academy of Sciences,conclude that between 14 and 30 out of every 100 stars,with a mass and temperature similar to the Sun,may host a planet that could support life as we know it.Such a planet would have a diameter at least as large as Earth's,but no more than twice that big.The planet also would have to orbit in a star's habitable zone.That's where the surface temperature would allow any water to exist as a liquid.
The new estimate of how many planets might fit these conditions comes from studying more than 42,000 stars and identifying suitable worlds orbiting them.The scientists used those numbers to extrapolate(推算) to the rest of the stars that the telescope could not see.
The estimate is rough,the authors admit.If applied to the solar system,it would define as habitable a zone starting as close to the Sun as Venus and running to as far away as Mars.Neither planet is Earthlike (although either might have been in the distant past).Using tighter limits,the researchers estimate that between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world.These are ones that would take 200 to 400 days to complete a yearly orbit.
Four out of every 100 sunlike stars doesn't sound like a big number.It would mean,however,that the Milky Way could host more than a billion Earth-sized planets with a chance for life.This is the first research finding about the planets with a chance for life.A:Right B:Wrong C:Not mentioned
选项
This is the first research finding about the planets with a chance for life.
A:Right
B:Wrong
C:Not mentioned
答案
C
解析
第二段第一句表明,近来的机械故障使开普勒太空望远镜不再为我们服务,通篇并没有提到开普勒太空望远镜为我们服务了多少年,所以选择C项。
第二段最后一句表明,开普勒太空望远镜主要关注与地球有相似环境的星球,所以选择A项。
第三段第二句表明,可以让生命存在的星球的直径至少要和地球的直径一样大,但不会超过地球直径的两倍。由此不难推断出其应该不比地球小,所以选择B项。
第三段第三、四句表明,适合人类居住的星球必须与它所环绕的恒星有一个适于居住的距离,以保证星球表面的温度能够允许液态水的存在。地球不仅适合人类居住,而且还绕着太阳运行。由此可知,题干表述正确。
第四段第一句表明,该项新评估源于对超过4.2万颗星球的分析,而非源于对17万颗星球的分析,所以选择B项。
第五段第一句表明,研究人员承认这项评估是粗糙的,即不精确的,所以选择A项。
文章第一段指出,这次的调查结果是新的发现,但通篇文章并未提到这是对可能有生命存在的星球的首次研究。
转载请注明原文地址:https://tihaiku.com/zcyy/1493042.html
本试题收录于:
理工B题库理工类分类
理工B
理工类
相关试题推荐
共用题干 第一篇PreservingNatureforFutureDem
共用题干 第二篇SavingMoneyWhereyousaveyour
共用题干 第二篇SavingMoneyWhereyousaveyour
共用题干 第二篇SavingMoneyWhereyousaveyour
共用题干 第三篇ADebateontheEnglishLanguag
共用题干 SearchingforSmiles1Askmostpeo
共用题干 SearchingforSmiles1Askmostpeo
共用题干 SearchingforSmiles1Askmostpeo
共用题干 SearchingforSmiles1Askmostpeo
共用题干 EsteeLauderDied1ThechildofCe
随机试题
[originaltext]W:ABCRestaurant,canIhelpyou?M:Hi,couldyoutellmewhat
Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelow:1.我们
[originaltext]W:Hey,Tom,what’sthatyou’rereading?M:It’saletterfroma
某定风量空调系统采用无机玻璃钢风管,由于机房空间受限,无法安装消声器,送风管途经
股票类证券产品的基本特征包括()。 Ⅰ.收益性 Ⅱ.偿还性 Ⅲ.风险性
喷他佐辛很少引起成瘾是因为A:拮抗μ受体 B:拮抗K受体 C:拮抗α受体
餐厨垃圾饲料加工脱水技术中,能保持蛋白质不变性的为( )。A.干燥法 B.高
A.骨下袋 B.复合袋 C.骨上袋 D.复杂袋 E.龈袋袋底位于牙槽嵴根
监理工程师在协助业主进行物资供应决策时,应进行的工作是( )。A.编制物资供应
某企业组织火灾事故应急演练,当天演练组织部门提前到达演练现场,对演练准备工作进行
最新回复
(
0
)