首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Because the planets are the same size as Earth. B、Because the planets are similar in many aspects to Earth. C、Because the plan
A、Because the planets are the same size as Earth. B、Because the planets are similar in many aspects to Earth. C、Because the plan
admin
2018-03-26
81
问题
Astronomers have found at least seven Earth-sized planets orbiting the same star 40 light-years away, according to a study published Wednesday in the journal Nature. The findings were also announced at a news conference at NASA headquarters in Washington. (16) This discovery outside of our solar system is rare because the planets have the winning combination of being similar in size to Earth and being all temperate, meaning they could have water on their surface and potentially support life.
"This is the first time that so many planets of this kind are found around the same star," said Michael Gillon, lead study author and astronomer at the University of Liege in Belgium.
The seven exoplanets were all found in tight formation around an ultra-cool dwarf star called TRAPPIST-1. (17) Estimates of their mass also indicate that they are rocky planets, rather than being gaseous like Jupiter. Three planets are in the habitable zone of the star, known as TRAPPIST-1 e, f and g, and may even have oceans on the surface.
(18) The researchers believe that TRAPPIST-lf in particular is the best candidate for supporting life. It’s a bit cooler than Earth, but could be suitable with the right atmosphere and enough greenhouse gases.
"I think we’ve made a crucial step towards finding if there is life out there," said Amaury Triaud, one of the study authors and an astronomer at the University of Cambridge. "I don’t think any time before we had the right planets to discover and find out if there was life. Here, if life managed to thrive and releases gases similar to what we have on Earth, we will know."
Questions 16 to 18 are based on the passage you have just heard.
16. Why is the discovery outside of our solar system rare?
17. What do estimates of the mass of the seven exoplanets indicate?
18. Why do researchers think that TRAPPIST-1f is the most suitable for life?
选项
A、Because the planets are the same size as Earth.
B、Because the planets are similar in many aspects to Earth.
C、Because the planets are capable of supporting life.
D、Because the planets have water on their surface.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/kva7777K
0
大学英语四级
相关试题推荐
1978年底召开的中共第十一届三中全会(TheThirdPlenarySessionoftheCPC11thCentralCommittee)代表了新中国历史上一个意义深远的转折点。自1979年起,中国开始实施由邓小平发起的改革开放政策。
A、DuringtheBritishGrandPrix.B、DuringtheMexicanGrandPrix.C、Onhiswaytothestudio.D、Duringhislastrace.A女士问男士最糟糕的
A、TotalkwithDr.Alberti.B、Togotoseeasuperior.C、TotakeATcourses.D、Tospeakoutforthemselves.C
A、Officegossipmayboostwhenthecompanyexpands.B、Workersdarenottogossipwhenthecompanyisdownsizing.C、Officegossip
A、Kidsshouldspendmoretimeoutdoors.B、Kidsallliketreesandflowers.C、Kidsmaylearnbetteringreennature.D、Kidsshoul
Workerswithskillsinscience,technology,engineering,andmathematics(STEM)areamongthemostindemandandhighestpaid.The
ThesmallcoastaltownofBroome,innorthwestAustralia,isaremotevillageinthevastcountryside.Therearenotraffic
Ofallthecomponentsofagoodnight’ssleep,dreamsseemtobeleastwithinourcontrol.Indreams,awindowopensintoaworl
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwithagun,butthemanwiththe【C1】______computerinbu
A、Itisverycommercial.B、Itisverynoisy.C、Itisveryinsecure.D、Itisveryunfriendly.B信息明示题。文章最后描述Ihopethisdoesn’tso
随机试题
马来丝虫病慢性期最常见的临床症状是
硫酸亚铁主要用于治疗
一蒽醌的IR谱羰基吸收峰为1665,1630cm-1,说明该化合物有几个α-OH
按金融工具的属性可以将金融市场分为()。
人们常说“心动不如行动”,原因在于()
一天早餐后,大(2)班的乐凯小朋友想到建筑区玩,但因他用餐速度较慢,建筑区的人数已满,但乐凯硬要往里进。正在区内玩的成宽对他说:“今天建筑区已经有四个人了,你明天再玩吧。”乐凯却霸道地说:“你出来,我要进去玩!”成宽也不示弱,说:“我先来的!”乐凯不容分说
若函数f(x,y)对任意正实数t,满足f(tx,ty)=tnf(x,y),(7.12)称f(x,y)为n次齐次函数.设f(x,y)是可微函数,证明:f(x,y)为n次齐次函数
Thepolicefoundthatthehouse______andalotofthings
MostpeoplesaythattheUSAismakingprogressinfightingAIDS,buttheydon’tknowthere’scureandstronglydisagreethat"t
Althoughstillacontroversialsubject,thereisagrowingconsensusthat____________.(全球气候变化是由环境污染引起的),especiallybygreenhou
最新回复
(
0
)