首页
登录
职称英语
[originaltext]Astronomers have discovered a potentially habitable planet of sim
[originaltext]Astronomers have discovered a potentially habitable planet of sim
游客
2023-09-04
36
管理
问题
Astronomers have discovered a potentially habitable planet of similar size to Earth in orbit around a nearby star. A team of planet hunters spotted the alien world circling a red dwarf star called Gliese 581, 20 light years away. The planet is in the “Goldilocks zone” of space around a star where surface temperatures are neither too hot nor too cold for liquid water to form. If confirmed, the planet would be the most Earth-like that has ever been discovered in another solar system and the first strong contender for a habitable one. More than 400 exoplanets have been discovered by astronomers, but most are gas giants, like Jupiter, that would be inhospitable to life as we know it. Astronomers used the Keck telescope in Hawaii to study the movement of Gliese 581 in exquisite detail and from their observations inferred the presence of a number of orbiting planets. The team report two new planets in the Astrophysical Journal, bringing the total number known to be circling the star to six. One of the planets, named Gliese 581g, has a mass of three to four times that of Earth and takes 37 days to orbit the star. Astronomers believe it is a rocky planet with enough gravity to retain an atmosphere. Unlike the previously discovered planets, Gliese 581g lies squarely in the region of space where life can thrive. One side of the planet is always facing the star, much as one side of the moon constantly faces Earth. The average temperature on the planet is estimated to be between -31 to -12℃, but the ground temperature would vary from blazing hot on the bright side and freezing on the dark side.
Questions 32 to 35 are based on the passage you have just heard.
32. What can we learn about Gliese 581?
33. How many planets are circling Gliese 581 so far as we know?
34. What do astronomers think of the planet Gliese 581g?
35. In what aspect does Gliese 581g resemble the moon?
选项
A、It has the identical inner structure to Earth.
B、It has a mass of four to six times that of Earth.
C、It takes 73 days to orbit the star Gliese 581.
D、It has enough gravity to hold an atmosphere.
答案
D
解析
选项中的It,identical...to Earth,orbit the star,has...gravity等表明,It指代某个星球,本题考查该星球的情况。短文中提到,天文学家相信Gliese 581g行星是一颗岩态行星,其重力足以形成大气层,[D]是该行星的特点之一,故为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2983441.html
相关试题推荐
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
[originaltext]Afewtimeseachmonth,second-gradepupilsataprimarysch
[originaltext]M:Hithere.(19)Haveyouheardthatthecompanyiscuttingstaff?
[originaltext]M:Hithere.(19)Haveyouheardthatthecompanyiscuttingstaff?
[originaltext]M:Hithere.(19)Haveyouheardthatthecompanyiscuttingstaff?
[originaltext]M:HeyLinda,didyougetthatletteraboutthenewoptionsforf
随机试题
Forshopaholics,thepost-【T1】______periodmeansonlyonething:sales.Acr
字母的基本字体不包括( )。A.正体 B.等线体 C.斜体 D.花体
为何耍使用增感屏?使用时应注意些什么?
健康指导的主要工作内容包括( )A.健康干预 B.跟踪随访 C.健康教育
某国有企业主要领导人为了自身的利益,让统计人员将当年的工业总产值3.2亿元上报为
(2012年) 被审计单位甲公司是F1赛事中国站的赞助商,送给项目合伙
呈板片状或浅槽状,外表面黄褐色或黄棕色,内表面暗黄色或淡棕黄色。断面深黄色,纤维
Thechangeinthatvillagewasmiraculou
既可用治热毒血痢,又可用治冷积久痢的药物是( )。A.白头翁 B.鸦胆子
如果和分别代表电磁波中的电场向量和磁场向量,则电磁波的传播方向为( )。
最新回复
(
0
)