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
2023-12-18
8
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、six
B、nine
C、twelve
D、sixteen
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3283738.html
相关试题推荐
[originaltext]IntelbasedinCaliforniahasgonefromstrengthtostrengths
[originaltext]ThestockmarketinNewYorkhasdriftedupanddownaftercom
[originaltext]Clerk:Goodmorning,sir.CanIhelpyou?Customer:Iwanttomak
[originaltext]Clerk:Goodmorning,sir.CanIhelpyou?Customer:Iwanttomak
[originaltext]Clerk:Goodmorning,sir.CanIhelpyou?Customer:Iwanttomak
[originaltext]Clerk:Goodmorning,sir.CanIhelpyou?Customer:Iwanttomak
[originaltext]TornadoessweptthroughnorthernBangladesh,killingatleast
[originaltext]TornadoessweptthroughnorthernBangladesh,killingatleast
[originaltext]LOSANGELES—SamEdwards,acharacteractorwhomadescoresof
[originaltext]ChinaonTuesdayexpresseditsregretovertheEU’srecentfa
随机试题
Atrendamongmanycollegesanduniversitiesistooffercoursesthataresl
Dailynewspaperhasaneditorialpage.Hereopinionisexpressedoneventsa
定期定额纳税户广林酒店的老板王某,2010年1月,将酒店承包给李某经营,李
原尿中的[HCO]葡萄糖等被重吸收的主要部位是A.髓襻升支 B.近曲小管 C
下述对民间歌曲《茉莉花》表述错误的是。( )A.《茉莉花》民间小调,流传最广的
各级别轿车历年销售份额(%) 相对于2001年,10年的销售份额增长率最大
PHA刺激法可用于( )。A.测定Tc细胞的效应功能 B.IgG测定 C.
王某于2011年4月将自住房出租给李某1年,年租金为5000元。2011年5月王
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
实行法人责任制的建设项目,项目总经理的职责有()。A.负责筹措建设资金 B.
最新回复
(
0
)