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
2025-01-08
15
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/3903140.html
相关试题推荐
[originaltext]InternationalOlympicCommitteedelegatespraisedToronto’sp
[originaltext]Brazil’sGustavoKuertenhasbeennamedtheAssociationofTen
[originaltext]GovernmentofficialshaveorderedaplantofJapan’slargestd
[originaltext]Headmaster:Goodmorning,MrHarris.Dositdown.Iunder-stand
[originaltext]Headmaster:Goodmorning,MrHarris.Dositdown.Iunder-stand
[originaltext]Headmaster:Goodmorning,MrHarris.Dositdown.Iunder-stand
[originaltext]Headmaster:Goodmorning,MrHarris.Dositdown.Iunder-stand
[originaltext]OnDecember25,2000,.manyPe0PleacrossNorthAmericareceiv
[originaltext]OnDecember25,2000,.manyPe0PleacrossNorthAmericareceiv
[originaltext]ThisisBobSmithfromBBC.I’matthesceneofamiraculousr
随机试题
ChristianshavegenerallyregardedChristmasasbothaholydayandholiday.
It’sourguiltypleasure:WatchingTVisthemostcommoneverydayactivity,
Itisnoteasytoremaintranquilwheneventssuddenlychangeyourlife.A、superi
Onedayinthedeadofwinter,Ilookedoutmybackwindowandsawachicken.
YoungWorkersPushEmployersforWiderWebAccess[A]RyanTracythoughthe’
以下是集料水煮法操作步骤的有()。A.将集料过13.2mm、19mm的筛,取存
施工图设计评审的总体审核中,首先应审核()。A.工艺合理性 B.施工图纸的完整
分部工程验收的主要工作是()。A.检查工程是否达到设计标准或合同约定标准要
男,46岁,吸烟史20年,发热2周(37.5?38°C),右胸疼痛,近4天胸
通常以独立的单项工程或完整的工程项目为计算对象编制确定的生产要素消耗的数量标准或
最新回复
(
0
)