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
50
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]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
某水闸建在岩基上,共8孔,每孔净宽10m,两孔一联浮筏式,每联底宽25m,闸室顺
下列哪项最适合选作这幅画的标签( ) A.凡·高斗牛士现代派德国 B.
乙公司为增值税一般纳税人,适用的增值税税率为13%。2013年度发生的部分经济业
A.静脉肾盂造影可见肾实质显影时间延长 B.静脉肾盂造影可见肾盂、肾盏有移位、
A.抑制单胺氧化酶 B.抑制TXA生成 C.抑制胆碱酯酶 D.激动多巴胺受
当归四逆汤的功用是A.温阳补血,散寒通滞B.温经补虚,祛瘀止痛C.温经散寒,养血
狭义的薪酬体系决策的主要任务是确定( )以什么为基础。A.企业的基本薪酬 B
盗用普通客户的身份资料购买汽车并申请银行贷款的行为是()。A.一车多贷 B
消防水泵及稳压泵的施工程序中,泵体安装的紧后工序是()。A.泵体稳固 B.吸
最新回复
(
0
)