首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The US space agency’s(NASA) Mars rovers are celebrating a remarkable five years on the Red Planet. The fist rover, named Spi
The US space agency’s(NASA) Mars rovers are celebrating a remarkable five years on the Red Planet. The fist rover, named Spi
admin
2011-02-05
23
问题
The US space agency’s(NASA) Mars rovers are celebrating a remarkable five years on the Red Planet.
The fist rover, named Spirit, landed on January 3, 2004, followed by its twin, Oportunity, 21 days later.
It was hoped the robots would work for at least three months, but their longevity in the freezing Martian conditions has surprised everyone.
The rovers’ data has revealed much about the history of water on the equator of Mars billions of years ago.
"These rovers are incredibly resilient considering the extreme environment the hardware experiences every day," said John Callas, project manager for Spirit and Opportunity at NASA’s Jet Propulsion laboratory in Pasadena, California. "We realize that a major component on either vehicle could fail at any time and end a mission with no advance notice, but on the other hand, we could accomplish the equivalent of four more prime missions on each rover in the year ahead. "
Spirit is exploring a 150 km-wide bowl-shaped depression known as Gusev Crater. It has found an abundance of rock and soils bearing evidence of extensive exposure to water.
Opportunity is on the other side of the planet, in a flat region known as Meridiani Planum. Its data have shown conclusively that this part of Mars experienced liquid water on its surface. The sedimentary rocks at its study location were laid down under gently flowing surface water.
The rovers are now showing some serious signs of wear and tear.
Spirit has to driver backwards everywhere it goes because of a jammed wheel, and Opportunity’s robotic arm has a glitch in a shoulder joint because of a broken electrical wire.
There have been times also when the vehicles have been dangerously short on power because of the dust covering on their solar panels.
When Spirit and Opportunity do eventually fail, NASA will have to wait awhile for its next surface mission.
It recently delayed this year’s planned launch of a much more capable vehicle, known as the Mars Science Laboratory (MSL) to 2011. The rover project has been beset by technical and budgetary problems. The decision was taken not long after Europe also postponed its rover venture known as ExoMars. Officials cited cost concerns. It is likely all surface missions in future for NASA and the European Space Agency will be joint affairs because of the high cost if getting spacecraft down on to the planet.
NASA lost contact with its static Phoenix lander in November. It was operating in much more difficult conditions at a high-latitude location.
Why will NASA and the European Space Agency combine their efforts to explore Mars in the future?
选项
答案
Because of the high cost/expense
解析
转载请注明原文地址:https://jikaoti.com/ti/daLMFFFM
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
PASSAGEONEWhat’stheauthor’sattitudetowardcurrentAmericaneducation?
PASSAGEONEAccordingtothescientists,whatcausesthecommonoccurrenceofricketsamongchildren?
(1)You’rebusyfillingouttheapplicationformforapositionyoureallyneed;let’sassumeyouonceactuallycompletedacoup
(1)NearusonourstreettherewasafamilywithagirlmyagecalledSafinaandtwoboyssimilarinagetomybrothers,Babar
(1)Youwon’talwaysgetalongwitheveryoneyouworkwith.Butwhenthere’sfrictionbetweenyouandyourboss,that’saproble
Doyouknowhowtouseacameraproperly?First,slidethepowerswitchtothe"on"position.Thesecondstepistocheckthatt
ARemarkableBicyclistandaRemarkableHumanBeingJustinJohnsonisaremarkablehumanbeing.Hewasbornwithnumerousha
Thedeadlineforapplicationsisinthreemonths.
AccordingtotheWorldWildlifeFund,thepolarbearcouldbefacedwithextinctionandalargenumberofotheranimalsreduced
Well,urn,let’sturnnowtovasepainting.VasepaintingwasaverypoplarformofartamongtheGreeks.Illustrationsofthel
随机试题
农民郭某在自己承包的土地上挖了一个养鱼池进行甲鱼养殖。某食品有限公司的废水排放渠距离养鱼池只有50米远。郭某听说食品有限公司排放的废水中有很多营养物质,于是萌发了引废水养甲鱼的想法。一天夜里,郭某偷偷扒开食品有限公司的排污渠将废水引入自己的养鱼池。第二天郭
患者,男,57岁。因胃癌行胃癌根治术后2周,出现右下肢肿胀、疼痛,B超示右股静脉血栓形成,为防止肺栓塞,护理上不当的是
不属于激光热成像的胶片结构是
新生儿用药受哪些因素影响( )。
下列属于《招标投标法》规定的招标方式是:
简述班级授课的优点。
2011年,Z省对8个主要市场的进口额增速最快的三个国家或地区的进口额之和为()。
在卡特尔智力结构学说中,属于晶体智力的是()
[*]
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
最新回复
(
0
)