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
2024-03-02
64
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:http://tihaiku.com/zcyy/3499121.html
相关试题推荐
[originaltext]Thelife-savingvalueofsafetybeltshasbeenfirmlyestabli
[originaltext]Learningthelanguageofacountryisn’tenough.Ifyouwant
[originaltext]Learningthelanguageofacountryisn’tenough.Ifyouwant
[originaltext]Anoblemanandabusinessmanoncemetinarestaurant.Forth
[originaltext]Anoblemanandabusinessmanoncemetinarestaurant.Forth
[originaltext]Baker:Sincesomanyofyouhaveaskedmeabouthowtolearnala
[originaltext]M:Hi,Sarah,what’sup?W:Oh,hi.Ijustgotoutofahistoryc
【B1】[br]【B11】[originaltext]Itseemsthatbeautyandwomenaretwins.You
【B1】[br]【B10】[originaltext]Itseemsthatbeautyandwomenaretwins.You
【B1】[br]【B9】[originaltext]Itseemsthatbeautyandwomenaretwins.Youa
随机试题
Thepartoftheenvironmentalmovementthatdrawsmyfirm’sattentionisthe
……文明是多彩的,人类文明因多样才有交流互鉴的价值。阳光有七种颜色,世界也是多彩的。一个国家和民族的文明是一个国家和民族的集体记忆。人类在漫长的历史长河
Whichkindoftransportisthemansuggestingthatthewomantakes?[br][origi
下面关于无线局域网(ULAN)主要工作过程的描述,正确的是()。A.扫频就是无
下列墙体在其两侧温差作用下,哪一种墙体内部导热传热占主导,对流、辐射可忽略?(
银行间债券市场的组织体系包括( )。 Ⅰ市场主管部门 Ⅱ发行主体 Ⅲ投资
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
“(秦孝公)以卫鞅为左庶长,卒定变法之令。令民为什伍,而相牧司连坐。不告奸者腰斩
生产安全事故等级的划分指标有()。A.死亡人数 B.间接经济损失 C.
隧道光面爆破的主要参数包括()。A.周边眼间距 B.爆破层厚度 C.周边眼
最新回复
(
0
)