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
U.S. Scientists Confirm Water on Mars NASA scientists said that Mars was covered once by vast lakes, flowing rivers and a va
U.S. Scientists Confirm Water on Mars NASA scientists said that Mars was covered once by vast lakes, flowing rivers and a va
admin
2011-01-02
77
问题
U.S. Scientists Confirm Water on Mars
NASA scientists said that Mars was covered once by vast lakes, flowing rivers and a variety of other wet environments that had the potential to support life.
Laboratory tests aboard NASA’s Phoenix Mars Lander have identified water in a soil sample. The lander’s robotic arm delivered the sample Wednesday to an instrument that identifies vapors produced by the heating of samples.
"We have water," said William Boynton of the University of Arizona, lead scientist for the Thermal and Evolved-Gas Analyzer, or TEGA. "This is the first time Martian water has been touched and tasted. "
The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of, what its water is like, and whether it is or has ever been a possible habitat for life.
The soil sample came from a trench approximately 2 inches deep. When the robotic arm first reached that depth, it hit a hard layer of frozen soil. Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop. Most of the material in Wednesday’s sample had been exposed to the air for two days, letting some of the water in the sample vaporize away and making the soil easier to handle.
"Mars is giving us some surprises," said Phoenix principal investigator Peter Smith of the University of Arizona. "We’re excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck, different from what we expected, from all the Mars simulation testing we’ve done so far. "
Since landing on May 25, Phoenix has been studying soil with. a chemistry lab, TEGA, a microscope, a conductivity probe and cameras. The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.
The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.
"It’s a 30-watt light bulb giving us a laser show on Mars," said Victoria Hipkin of the Canadian Space Agency.
A full-circle, color panorama of Phoenix’s surroundings also has been completed by the spacecraft.
"The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see," said Mark Lemmon of Texas A & M University, lead scientist for Phoenix’s Surface Stereo Imager camera. "They help us plan measurements we’re making within reach of the robotic arm and interpret those measurements on a wider scale. "
Which one of the following statements is NOT meant by the writer?
选项
A、Scientists have been trying to break the ice-rich layers of soil on Mars.
B、Scientists have been surprised by how the soil on Mars behaves.
C、Scientists have been trying to find out if there is life supporting material on Mars.
D、Scientists have been trying to know if water ice. will melt.
答案
A
解析
B、C、D均在文中有所涉及,A并未出现在文中。根据排除法,选择A。
转载请注明原文地址:https://kaotiyun.com/show/T8Ld777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
OntheTrialoftheHoneyBadgerOnarecentfieldtriptotheKalahariDesert,ateamofresearcherslearnalotmoreabout
LivingAloneCouldBeGoodforYourWeightGoodnewsforpeoplelivingalone:Aforthcomingpapershowsthatsingleadults—o
ThispoemdepictsthebeautifulsceneryofasmalltownintheSouth.
HowtheBodyKeepstheSameTemperatureThetemperatureofyourbodyshouldbealwaysjustthesame,nomatterwhethertheweath
AAttractionsofTravellingBLanguageProblemWhenEatingOutCRevolutionCausedbyJetsDHowTravellers’ConcernsAreMe
WhatdoesProfessorLibbrechtbelievetobetrue?Whatarethefactorsthataffecttheshapeandgrowthrateofasnowcrystal?
Wehavetothinkverycarefullybeforewetakeanyaction,becauseit’saveryserioussituationwehaveencountered.
ChangesinMuseumsMuseumshavechanged.Theyarenolongerplacesthatone“should”visit,theyareplacestoenjoyandl
CommunicationwithCustomersOnlineUntilthelate1940s,whentelevisionbeganfindingitswayintoAmericanhomes,compani
Customersoftendeferpaymentforaslongaspossible.
随机试题
已知A=求A的特征值和特征向量,并分析k为何值时,A能相似于对角阵,k为何值时,A不能相似于对角阵.
在Internet上广泛使用的WWW是一种()
炮制对含生物碱类药物的影响,叙述正确的是
结核性腹膜炎急性胰腺炎
保险代理人、保险经纪人应当具备保险监督管理机构规定的资格条件,并取得()颁发的经营保险代理业务许可证或者经纪业务许可证。
光华居委会2016年6月进行换届选举,以下说法错误的是()。
大部分拖稿狂天天活在催稿的阴影中,听到电话响就___________害怕是催稿,上MSN怕被编辑抓到只能___________玩隐身,微博只敢看不敢发怕被说有时间更新没时间写稿,编造的拖稿理由___________,什么手指软组织挫伤、眼压高导致间歇性失明
在美国,癌症病人的平均生存年限,即从确诊为癌症到死亡的年限是7年,而在亚洲癌症病人的平均生存年限只有4年,因此美国在延长癌症病人生命方面的医疗水平要高于亚洲。以下哪项如果为真,最能削弱上述论证?
社会主义改造基本完成后,国家政治生活的主题是
Thefirstparagraphmainly______.Thepatentsystemisvaluablefortheeconomyinthat______.
最新回复
(
0
)