首页
登录
职称英语
Astronomers have discovered what may be five planetsorbiting Tau Ceti, the
Astronomers have discovered what may be five planetsorbiting Tau Ceti, the
游客
2023-12-07
9
管理
问题
Astronomers have discovered what may be five planets
orbiting Tau Ceti, the closest single star beyond our solar system
whose temperature and luminosity nearly matches the sun’s. If the 【M1】______
planets are there, one of them is about the right distance from the
star to support mild temperatures, oceans of liquid water, and even life.
Tau Ceti is only 12 light-years from Earth, just three times as
far as our sun’s nearest stellar neighbor, Alpha Centauri. Tau Ceti
assembles the sun so much that astronomer Frank Drake, who has 【M2】______
long sought radio signals from possible extraterrestrial civilizations,
made it his first target back in 1960. Unlike most stars, that are 【M3】______
faint, cool, and small, Tau Ceti is a bright G-type yellow
main-sequence star like the sun, a trait that only one in 25 stars
boasts of. Moreover, unlike Alpha Centauri, which also harbors a 【M4】______
G-type star and even a planet, Tau Ceti is single, therefore there’s 【M5】______
no second star in the system whose gravity could yank planets
away. Astronomer Mikko Tuomi of the University of Hertfordshire
in the United Kingdom and his colleagues analyzed more than
6,000 observations of Tau Ceti from telescopes in Chile, Australia,
and Hawaii. As the researchers will report in Astronomy &
Astrophysics, slight changes in Tau Ceti’s motion through space
suggest that the star may be responding to gravitational tugs from
five planets that are only about two to seven times as massive as
Earth. If that’s right, all five planets lie close to their star than Mars 【M6】______
does ours; however, Tau Ceti emits only 45% as much light as the 【M7】______
sun, so each planet receives less warmth than a planet would at the
same distance from our sun. Tau Ceti’s three innermost
planets — designated b, c, and d — are probably too hot to support
life, being such close to the star that they require only 14, 35, and 【M8】______
94 days to complete an orbit. The farthest of the three, d, is about
as close to Tau Ceti as Mercury is to the sun. It’s fourth 【M9】______
planet — planet e — that the scientists suggest might be another
life-bearing world, even though it’s about four times as massive as
Earth. If you live there, you’d see a yellow sun in the sky, but your 【M10】______
year would last just 168 days. [br] 【M9】
选项
答案
∧fourth—the
解析
冠词错误。序数词前要加定冠词the。
转载请注明原文地址:https://tihaiku.com/zcyy/3251058.html
相关试题推荐
In1964-1966,majorresourceofnaturalgaswerediscoveredintheBritishsecto
Aninternationalteamofastronomershasdiscovered11newplanetsoutsideth
AstronomershavediscoveredwhatmaybefiveplanetsorbitingTauCeti,the
AstronomershavediscoveredwhatmaybefiveplanetsorbitingTauCeti,the
AstronomershavediscoveredwhatmaybefiveplanetsorbitingTauCeti,the
AstronomershavediscoveredwhatmaybefiveplanetsorbitingTauCeti,the
AstronomershavediscoveredwhatmaybefiveplanetsorbitingTauCeti,the
JohnCabot,thepersonwhofirstdiscoveredCanadain1497wasa(n)______explore
WhofirstdiscoveredCanada?A、ChristopherColumbus.B、JacquesCarrier.C、Captain
______discoveredNewZealandin1642.A、MaorisB、JacquesCartierC、JamesCookD、
随机试题
Formanypeople,geneticallymodifiedfoodsraiseallkindsofquestions.Pa
下列关于血清碱性磷酸酶测定原理错误的是A.ALP催化4-NNP水解 B.对硝基
胆管癌易发生在胆管的A.上1/3 B.中1/3 C.下1/3 D.Vate
甲型肝炎的主要传播途经是( )。A.母婴 B.呼吸道 C.血液 D.土壤
急性阑尾炎早期脐周或上腹疼痛的原因是A.阑尾位置变动 B.阑尾管壁充血 C.
下列各项,对于鉴别水肿与鼓胀无意义的是()A.有无腹壁青筋暴露 B.有无
功能制护理的特点不包括A:节省人力 B:分工不明确,不利于按护士能力分工 C
肝性脑病合并碱中毒时应选用A.谷氨酸 B.精氨酸 C.鸟氨酸 D.色氨酸
妊娠期母体变化的描述,错误的是A.孕妇的夜尿量<日尿量 B.妊娠后期睡眠时稍垫
在含硫化氢的作业环境下进行作业时,应根据现场作业人员情况配备相应数量的()A:正
最新回复
(
0
)