首页
登录
职称英语
[originaltext] Most people think of astronomers as people who spend their ti
[originaltext] Most people think of astronomers as people who spend their ti
游客
2023-07-30
39
管理
问题
Most people think of astronomers as people who spend their time in cold observatories peering through telescope every night. In fact, a typical, astronomer spends most of his or her time analyzing data and may only be at the telescope a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all. You night not know how rarely images are viewed directly through telescopes. The most common way to observe the skies is to photograph them. The process is very simple. First, a photographic plate is coated with a lightsensitive material. The plate is positioned so that the image received by the telescope is recorded on it. Then, the image cam he developed, enlarged and published so that many people can study it. Because most astronomical objects are very remote, the light we receive from them is rather feeble. But by using a telescope as a camera, long time exposures can be made. In this way objects can be photographed that are a hundred times tm faint to be seen by just looking through a telescope.
选项
A、To overcome the problem of weak light.
B、To take more photographs.
C、To photograph astronomical objects without using a telescope.
D、To spend less time at their telescopes.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2882861.html
相关试题推荐
[originaltext]W:I’vejustreadacuriousfact.Didyouknowthatpeoplewhosp
[originaltext]W:I’vejustreadacuriousfact.Didyouknowthatpeoplewhosp
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]M:Thenwhydidyouapplyforthisjob?W:That’sbecauseofthe
[originaltext]Manyuniversitystudentsdislikestudyinghistorybecausetherei
[originaltext]Manyyearsagotherelivedaveryrichmanwhowantedtodosomet
[originaltext]Manyyearsagotherelivedaveryrichmanwhowantedtodosomet
随机试题
Peoplelearnlanguagesallthetime,andforallkindsofreasons.Forexamp
Howlongdoyouthink()tofinishthisurgenttask?A、didittakeyouB、itwillt
WhichofthefollowingistrueaboutthecatchesofPacificarea?[br][origina
[originaltext]W:Hi,Sam.WelcometotheEllenShow.M:Thankyou.W:Sam,how
建设、设计、施工单位不得擅自修改已经依法备案的建设工程消防设计。确需修改的,建设
在面向对象系统中,用()关系表示一个较大的“整体”类包含一个或多个较小的“
通过逐步增加系统负载,测试系统性能的变化,并最终确定在满足性能指标的情况下,系统
根据《证券期货投资者适当性管理办法》,产品或者服务存在下列( )因素的,应当审慎
H受体阻断药对下列何种病疗效最好A.口腔溃疡 B.卓-艾综合征 C.皮肤黏膜
将一个最大幅值为5V的模拟信号转换为数字信号,要使模拟信号每变化10mV,数字信
最新回复
(
0
)