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
35
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. "
What was discovered by NASA’s Phoenix Mars Lander on Mars?
选项
A、Vast lakes.
B、Flowing rivers.
C、Water in a soil sample.
D、Living things.
答案
C
解析
第二段指出,“在NASA的凤凰号火星探测车上进行的实验室测试已经确认其土壤样本中有水的存在。”其他选项都是科学家所推断的结论,而只有C选项是文中所明确指出的。所以确定答案是C。
转载请注明原文地址:https://kaotiyun.com/show/X8Ld777K
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
ProlongingHumanLifeProlonginghumanlifehasincreasedthesizeofthehumanpopulation.Manypeoplealivetodaywouldh
Paris1Paris,thecapitalandthelargestcityofthecountry,isinnorthcentralFrance.TheParismetropolitanareacontains
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smoreco
LungCancer1Thedeathrateduetocancerofthelungshasincreasedmorethan800percentinmalesandhasmorethandoubledi
Around45%oftheUK’scarbondioxideemissionscomefromtheenergypeopleuseeveryday—athomeandwhentheytravel.Inord
Thecommoditieswereallinspectedbythebureaubeforeshipment.
Choosingatopicforresearchisimportantinthatyouwillputagreatdealoftimeandenergyintoit.Anexcitingandorigin
Holonyak’scolleaguesthoughthewouldfailinhisresearchonLEDsatthetimewhenhestartedit.TheLemelson-M1TPrizehas
IrradiatingFoodIrradiatingfruits,vegetables,porkandchickentokillinsectsandbacteriahasbeenapprovedbytheFood
Heisdeterminedtoconsolidatehispower.
随机试题
A.肺纹理增粗、紊乱,呈蜂窝状小透明区B.咯血、肺浸润、低色素贫血、肾小球肾炎伴肾功能不全C.免疫低下患儿出现发热、咳嗽、咳胶胨样痰及咯血D.慢性咳嗽、咯血及小细胞低色素贫血E.骨折后7天突然出现胸痛、咯血及呼吸困难肺栓塞的特点是
激期佝偻病的血生化变化是
运用成本法评估无形资产时,其中无形资产的贬值率包含了()等因素。
春望(唐)杜甫国破山河在,城春草木深。感时花溅泪,恨别鸟惊心。烽火连三月,家书抵万金。白头搔更短,浑欲不胜簪。赏析名句“烽火连三月,家书抵万金。”
你负责一项工作,但是局长与分管副局长在工作思路上有分歧。你怎么办?
我国人民代表大会制度组织和活动的基本原则是()。
2011年上半年,我国软件产业实现软件业务收入8065亿元,同比增长29.3%,增速比去年同期高0.2个百分点;实现利润103亿元,同比增长34.9%。其中,6月份完成软件业务收入1828亿元,同比增长32.9%,增速比5月份回升3.6个百分点。
It’sthefirstquestionparentsaskwhentheirchildisdiagnosedwithautism(自闭症).Willhisfuturebrothersorsistershavea
LiMingdidnotpasstheexam,______.
Althoughtheyhadsignedthepeacetreaty,theywere______preparingforarenewedoffensive.
最新回复
(
0
)