首页
登录
职称英语
[originaltext] A group of college students is hoping to place a satellite pow
[originaltext] A group of college students is hoping to place a satellite pow
游客
2023-08-07
49
管理
问题
A group of college students is hoping to place a satellite powered only by water into an orbit around the moon. The students are from Cornell University in the state of New York. They are taking part in a competition called the Cube Quest Challenge. It is a program of NASA, the American space agency. The Cornell team is called the CisLunar Explorers. The word "cislunar" means "between Earth and the moon. " The challenge is simple: to design, build and deliver "flight-qualified, small satellites. " NASA officials say the satellites must be able to perform "advanced operations near and beyond the moon. " Ten teams are taking part in the competition. But the CisLunar Explorer satellites are different. They are the only ones using water to power their spacecraft. The idea for a water-powered vehicle came from Mason Peck, who works at Cornell University. He once worked as NASA’s chief technologist. He has always wanted to use something other than rockets to push spacecraft beyond Earth. " A lot of the mass we send into orbit these days is in the form of rockets—the only way we get anything into space," he said, in a Cornell press release. " But what if we could use what’s already there? If we could do that, if we could refuel spacecraft while they’re already in space..."
The spacecraft is shaped like the English letter L. It measures about 30 centimeters in length, and the two pieces are connected. Water is stored in the lower part of the satellite. The sun will separate the water into two elements: hydrogen and oxygen. When one combines hydrogen and oxygen with a spark, an explosion results. This provides a forward movement, known as thrust. The CisLunar Explorer team has an unusual way to guide its spacecraft. The idea is to copy how old-time sailors used the moon, sun and stars to fix their position on the oceans. The satellite is equipped with cameras. The cameras will take pictures of the sun, Earth and the moon and compare their positions and their size. Based on where the sun, moon and Earth are at any given time, the CisLunar Explorers will do the mathematics to find their position. The competition is being held in four parts. The Cornell team has been among the top three competitors during parts one and two. The final three winners will get to ride on NASA’s space launch system in early 2018.
Questions 16 to 18 are based on the recording you have just heard.
16. What makes the CisLunar Explorer satellites different?
17. Where did the CisLunar Explorer team get the idea?
18. How does the CisLunar Explorer team guide its spacecraft?
选项
A、They are the smallest satellites.
B、They are made by college students.
C、They are powered by water.
D、They are backed by NASA.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2905494.html
相关试题推荐
[originaltext]Scientificexperimentshavedemonstratedincrediblewaystokill
[originaltext]Scientificexperimentshavedemonstratedincrediblewaystokill
[originaltext]Mostsuccessfulpeopleareunorthodoxpersonswhosemindswander
[originaltext]EatGrubisBritain’sfirstnewfoodcompanythatbreaksWeste
[originaltext]There’salotaboutLeoSanchezandhisfarminSalinas,Califo
[originaltext]There’salotaboutLeoSanchezandhisfarminSalinas,Califo
[originaltext]EatGrubisBritain’sfirstnewfoodcompanythatbreaksWeste
[originaltext]EatGrubisBritain’sfirstnewfoodcompanythatbreaksWeste
[originaltext]There’salotaboutLeoSanchezandhisfarminSalinas,Califo
[originaltext]There’salotaboutLeoSanchezandhisfarminSalinas,Califo
随机试题
[originaltext]M:Hi,everyone,todaywe’regoingtotalkaboutBritishpolitene
生物圈保护区行动计划()空气污染[br]()防止沙漠化计划()大气变化K,M
[originaltext]W:Dr.Carter’sOffice.M:Yes,I’dliketomakeanappointmentt
下列几种结构面中,()属于原生结构面。A.沉积结构面 B.火成结构面 C
胃溃疡的特点不包括()A.胃溃疡、溃疡恶变和溃疡型癌三者区分困难 B.可
()又称票面收益率,是票面利息与面值的比率。??A.名义收益率 B.即期收益率
人参须根上具有的细小疣状突起称为A.疙瘩丁B.珍珠盘C.珍珠疙瘩D.珍珠须E.疙
卫生宣教往往是指卫生知识的A.立体传播 B.多向传播 C.三维传播 D.双
以下不属于电流互感器末屏接地不良现象的是()。末屏接地处有放电声响
()认为,个体对环境做出的适应性变化是一种内部结构的积极建构过程。A.维果茨基
最新回复
(
0
)