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 it has the right temperature and enough greenhouse gases. B、Because it has the right amount of water and enough greenh
A、Because it has the right temperature and enough greenhouse gases. B、Because it has the right amount of water and enough greenh
admin
2018-03-26
22
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 it has the right temperature and enough greenhouse gases.
B、Because it has the right amount of water and enough greenhouse gases.
C、Because it has the right atmosphere and enough greenhouse gases.
D、Because it has the right gravity and enough greenhouse gases.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/3va7777K
0
大学英语四级
相关试题推荐
A、Theycan’tstopterroristscommunicatingthroughthischannel.B、Theydidn’tadjusttheirpolicyoverthepastyear.C、Theydi
Forthispart,youareallowed30minutestowriteashortessayentitledDueAttentionShouldBeGiventoHandwriting.Youshou
A、Becausethosechildrencouldnotprovetheyregularlyatethere.B、Becausemostofthosechildrenarehealthy.C、Becauseconsu
Britishairisfarcleanerthanitwasafewdecadesago.Fewerpeopleusecoal-burningstoves:oldindustrialplantshavebeen
Foryears,highschoolstudentshavereceivedidenticaltextbooksastheirclassmates.Evenasstudentshavedifferentlearning
A、Fasteningherseatbelts.B、Listeningtothemusic.C、Enjoyingthebeautyoftheeveningsky.D、Sittinginasmoke-filledroom
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangiveinformation;wealsoexpressourfeelingsaboutwhat
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangiveinformation;wealsoexpressourfeelingsaboutwha
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmostareligion.Thousandsofsportsfansbuyexpensivetic
Herecomesthee-bookrevolutionA)Atwhattemperaturedoelectronicbookscatchfire?We’regoingtofindoutsometimethi
随机试题
网络商务信息是通过计算机网络传递的商务信息,它包括文字、数据、表格、图形、影像、声音以及内容,能够被人或计算机识别和感知的符号系统。()
A.常发生在进油腻食后B.过食、饮酒后发生C.腹痛在剧烈活动后发生D.持续性腹痛阵发加重E.转移性疼痛急性胆囊炎发病与饮食的关系是
承担临床研究的单位和临床研究者,应当
3岁患儿上楼梯时,其父向上牵拉右上肢,患儿哭叫,诉肘部疼痛,不肯用左手取物,最可能的诊断是
下列属于法律意识的表现的有()。
收入汇缴账户除向其基本存款账户或预算外资金财政专用存款账户划缴款项外,只收不付,不得支取现金。业务支出账户除从其甚本存款账户拨入款项外,只付不收,其现金支取必须按照同家现金管理的规定办理。()
承运人未按照约定的或者通常的线路运输,增加票款或者运输费用的,旅客、托运人或者收货人可以拒绝支付增加部分的票款或者运输费用。()
范例教学有三个基本特征,即基本性、基础性和范例性,其中范例性是针对()而言的。
1005×10061006-1006×10051005=?
A、Withquestionnaires.B、Bytelephones.C、OnInternet.D、Throughface-to-facetalk.CHowdidthemansaytheyinvestigatedthes
最新回复
(
0
)