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
2024-03-12
30
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、From a former Cornell University professor.
B、From a science program on television.
C、From a competition held by Cornell University.
D、From a former NASA’s chief technologist.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3526728.html
相关试题推荐
[originaltext]Moderator:Facedwithawidevarietyofgoodsintheshopping
[originaltext]Hello,everybody.WhatIwanttotalkabouttodayisanidea
[originaltext]Hello,everybody.WhatIwanttotalkabouttodayisanidea
[originaltext]Goodafternoon,everyone.Ican’ttellyouhowhonoredIamt
[originaltext]Goodafternoon,everyone.Ican’ttellyouhowhonoredIamt
[originaltext]Atyournextmeeting,waitforapauseinconversationandtry
[originaltext]Atyournextmeeting,waitforapauseinconversationandtry
[originaltext]Agricultureexpertshaveamessageforfarmersworldwide:Take
[originaltext]M:Hello,Nancy.Iknowyouareoneofthewomentaxidriversin
[originaltext]M:Hello,Nancy.Iknowyouareoneofthewomentaxidriversin
随机试题
Iftherootsoftheequation2y2+5y=3are-3and1/2,whataretherootsof2(y+
WriteNOMORETHANTWOWORDSforeachanswer.PartOne—Checklist:Write
当时如果逃避决斗,他将在社会上名声扫地。Atthattime,torunoutontheduelwouldmeansocialruin
Consolidatingyourstudentloansisn’ttheno-braineritusedtobe.Soinste
Ifyouwerestartingatopuniversitytoday,whatwoulditlooklike?Youw
Itwasimpossibleforyoutoavoid_______ifyoubothworkinthesameoffice.A
TheAmericanbabyboommadeunconvincingU.S.advicetopoorcountriesthat
内部控制结构阶段主要强调安全是制衡的结果,通过前中后台分离、不相容岗位与职务分离
对建筑层数确定时一般按建筑的自然层数来进行,下列空间可不计入建筑层数的有()。
组织兴奋后处于绝对不应期时,其兴奋性为()A.零 B.无限大 C.大于正
最新回复
(
0
)