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
84
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:http://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
TheCommercialisationofScienceandTechnologyScienceandtec
[originaltext]W:Excuseme,wherecanIfindtheseriesHairyPotter?Ihavebe
所示结构在q荷载作用下(自重不计),关于各段杆件内力的正确判断是( )。 A
下列不属于轻钢龙骨石膏板吊顶工程控制点()。A.基层弹线 B.基层清理 C
下列冷轧生产线预防跌倒及高处坠落的控制措施当中,说法错误的是()。A.冷轧机出
A.缩宫素引产 B.急诊剖宫产 C.择期剖宫产 D.自数胎动,继续妊娠
慢性特发性血小板减少性紫癜合并贫血最适宜的检查是A.血清铁蛋白测定 B.血清叶
引起“灰婴综合征”的药物是A.庆大霉素 B.吲哚美辛 C.红霉素 D.氯霉
2020年北京市生态与环境价值贴现值比直接经济价值贴现值、间接经济价值贴
四季豆是常见的蔬菜,如果烹饪时间太短,很容易引起中毒。对该食物中毒的主要预防措施
最新回复
(
0
)