首页
登录
职称英语
[originaltext] I am in search of another planet in the universe where life e
[originaltext] I am in search of another planet in the universe where life e
游客
2024-04-07
17
管理
问题
I am in search of another planet in the universe where life exists. [23-1] I can’t see this planet with my naked eyes or even with the most powerful telescopes we currently possess. But I know that it’s there. And understanding contradictions that occur in nature will help us find it.
On our planet, where there’s water, there’s life. So we look for planets that orbit at just the right distance from their stars. At this distance, shown in blue on this diagram for stars of different temperatures, planets could be warm enough for water to flow on their surfaces as lakes and oceans where life might reside. [23 - 2] Some astronomers focus their time and energy on finding planets at these distances from their stars. What I do picks up where their job ends. I model the possible climates of exoplanets. And here’s why that’s important: there are many factors besides distance from its star that control whether a planet can support life.
Take the planet Venus. It’s named after the Roman goddess of love and beauty, because of its benign, ethereal appearance in the sky. But spacecraft measurements revealed a different story. The surface temperature is close to 900 degrees Fahrenheit, 500 Celsius. That’s hot enough to melt lead. Its thick atmosphere, not its distance from the sun, is the reason. It causes a greenhouse effect on steroids, trapping heat from the sun and scorching the planet’s surface. The reality totally contradicted initial perceptions of this planet. [24] From these lessons from our own solar system, we’ve learned that a planet’s atmosphere is crucial to its climate and potential to host life.
We don’t know what the atmospheres of these planets are like because the planets are so small and dim compared to their stars and so far away from us. For example, one of the closest planets that could support surface water—it’s called Gliese 667 Cc—such a glamorous name, right, nice phone number for a name—it’s 23 light years away. So that’s more than 100 trillion miles. Trying to measure the atmospheric composition of an exoplanet passing in front of its host star is hard. It’s like trying to see a fruit fly passing in front of a car’s headlight. OK, now imagine that car is 100 trillion miles away, and you want to know the precise color of that fly.
So I use computer models to calculate the kind of atmosphere a planet would need to have a suitable climate for water and life.
Here’s an artist’s concept of [25] the planet Kepler-62f, with the Earth for reference. It’s 1,200 light years away, and just 40 percent larger than Earth. Our NSF-funded work found that it could be warm enough for open water from many types of atmospheres and orientations of its orbit. So I’d like future telescopes to follow up on this planet to look for signs of life.
23. Different from other astronomers, what does the speaker do?
24. What is crucial to a planet’s climate and potential to host life?
25. How far away is the planet Kepler-62f from earth?
选项
A、It’s 23 light years away.
B、It’s more than 100 trillion miles away.
C、It’s 1,200 light years away.
D、It’s 100 trillion miles away.
答案
C
解析
演讲中提到,“Gliese 667 Cc”,“23光年”,“100万亿英里”,而Kepler-62f距离地球则是1200光年。故选C。这种考查数字的细节问题,应该特别注意听每一个数字和相关的事件,做好笔记。
转载请注明原文地址:https://tihaiku.com/zcyy/3544808.html
相关试题推荐
[originaltext]Inrecentyears,manyAmericansofbothsexesandvariousage
[originaltext]Inrecentyears,manyAmericansofbothsexesandvariousage
[originaltext]Weknowthatwehavetopayforwhatweget.Ifwebuyfood,
[originaltext]M:Excuseme,couldyoupleasetellmehowtogettothetennisc
[originaltext]M:Excuseme,couldyoupleasetellmehowtogettothetennisc
[originaltext]M:Goodmorning,class.W:Goodmorning,sir.M:Todaywe’lldisc
[originaltext]M:Goodmorning,class.W:Goodmorning,sir.M:Todaywe’lldisc
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
随机试题
4KindsofTextsEnhancingIntelligenceI.IntroductionA.R
在正常生产情况下,同一批混凝土强度值服从( )。A.二项分布 B.正态分布
消防应急广播的保养方法有()。A.用吸尘器、清洁的干软布等清除机壳表面及所有接线
某工作室 任务描述: 图29-1-6~图29-1-8为某工作室局部平面图,按
借助计算机建筑工程项目管理系统和网络技术,可以实现项目管理人员之间的数据传输和信
根据信托的设立是否需要委托人的意思表示,可以将信托区分为营业信托和民事信托。(
下列不属于《中华人民共和国监察法》所规定的监督对象的是:A.某居民委员会的主任
“一国两制”是实现祖国和平统的一项重要制度,是中国特色社会主义的一个伟大创举。2
下列关于婴儿动作发展的排序,正确的是A.翻身一坐一抬头一站立一行走 B.抬头一
下列不属于会计核算职能的是( )。A.确定经济活动是否应该或能够进行会计处理
最新回复
(
0
)