首页
登录
职称英语
[originaltext] CAPE CANAVERAL, Fla.—The spacecraft Messenger rocketed away Tu
[originaltext] CAPE CANAVERAL, Fla.—The spacecraft Messenger rocketed away Tu
游客
2023-12-20
5
管理
问题
CAPE CANAVERAL, Fla.—The spacecraft Messenger rocketed away Tuesday on a long quest to reveal the secrets of mysterious, superhot Mercury, the sun’s nearest planet.
"A voyage of mythological proportions," a NASA flight controller announced as soon as Messenger shed its final rocket stage hours before dawn.
The journey will take 6 1/2 years, covering nearly 5 billion miles on a roundabout ramble through the inner solar system. The probe should reach Mercury by March 2011, then spend a year gathering data.
Scientists want to know how the planet turned out the way it did, and whether the perpetually dark craters at the poles hold ice. Anything scientists can learn about how Mercury formed will shed light on the origins of Venus, Earth and Mars, each one very different.
Tuesday’s launch came one day later than planned; Monday’s attempt had to be scrubbed because of bad weather.
It was a busy night for the U. S. space agency with the Mercury send-off coming less than an hour before another NASA unit directed a spacewalk by the astronaut and cosmonaut aboard the international space station.
The Messenger mission is part of NASA’s bargain-focused Discovery program costing $427 million for the launch and all the scientific analysis years later in a mission devised by John Hopkins University.
选项
A、nearest of all planets to the sun
B、extremely hot
C、little known to people
D、biggest of all planets
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3288580.html
相关试题推荐
[originaltext]ThetraditionalAmericanfamilyusedtohaveaworkingfather
[originaltext]ThetraditionalAmericanfamilyusedtohaveaworkingfather
[originaltext]W:Firstofall,whendopeoplestarttoworkinAmericanoffices
[originaltext]W:Firstofall,whendopeoplestarttoworkinAmericanoffices
[originaltext]W:Firstofall,whendopeoplestarttoworkinAmericanoffices
[originaltext]W:Firstofall,whendopeoplestarttoworkinAmericanoffices
[originaltext]AccordingtoMafou,outofallthestreetchildrenlivingin
[originaltext]AccordingtoMafou,outofallthestreetchildrenlivingin
[originaltext]AccordingtoMafou,outofallthestreetchildrenlivingin
[originaltext]W:HowclosetothetowncentreofCambridgearewehere?M:Oh,
随机试题
[audioFiles]audio_eusm_j01_323(20099)[/audioFiles]A、Helostabuttonatwork.B
Itisnotunusualtodayforoldpeopletospoiltheirgrandchildrenwithtoy
下列语句中,计量单位使用正确的是( )。A.距离为25吋 B.质量m=30k
( )设计模式能使一个对象的状态发生改变时通知所有依赖它的监听者。( )设计
以直接费为取费基数时,下列企业管理费费率计算公式中,正确的是()。A:企业管理
一般而言,存货周转次数增加,其所反映的信息有( )。A.盈利能力下降 B.存货
O/W型乳化剂的HLB值一般为A.1~3 B.3~8 C.9~12 D.8
治疗风湿性二尖瓣狭窄药物中,苄星青霉素的作用是防止A.风湿热 B.心力衰竭
电压互感器声响比平常增大,可能主要原因有()二次开路$;$过电压$;$铁磁谐
工程变更如果涉及结构主体安全时,该工程变更还要按有关规定报送()及管理部门进
最新回复
(
0
)