What is the one reason astronomers make long time exposures?

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问题 What is the one reason astronomers make long time exposures?

选项 A、To spend less time at their telescopes.
B、To overcome the problem of weak light.
C、To take more photographs.
D、To photograph astronomical objects without using a telescope.

答案B

解析细节题。文章后面讲到由于大部分天体距离很远，所以我们能捕捉到的它们所发出的光线也很微弱，但如果用望远镜充当照相机就可以进行长时间曝光，以此将物体拍下来。故B项正确。

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专业英语四级

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What is the one reason astronomers make long time exposures?

专业英语四级

WhichofthefollowingisNOTmentionedinthenews?

What’sthefirststeptogettingajobinterview?Gettingpasttherecruiter.Recruitersareusuallyyourfirstcontactwithap

BilingualeducationiscontroversialintheUnitedStates.【C1】,agrowingbodyofresearchshowsthat【C2】speakingt

ThedevelopmentofJamestowninVirginiaduringthesecondhalfofthe17thcenturywascloselyrelatedtothemakinganduseof

Itisrareforataleofacademicmismanagementinasmallinstitutiontograbnationalattention.ButSciences-Poisnoordinar

Thedrugsmust______ineverywaytothestandardssetupbythegovernment.

Thenovelcontainssomemarvelouslyrevealing______ofrurallifeinthe19thcentury.

Wetriedtosettletheproblemwiththemassoonaspossible,buttheyseemedto______sincerity.

Iknowyoucan______anydifficultiesthatmaystandinthewayofyourgettinganeducation.

WhatisTRUEaboutGeneralMladic?

简述王褒的《洞箫赋》在咏物赋发展史上的贡献。

哈特认为，消除法律规则和社会压力无效性的规则是

食管上接咽，相当于下列哪项水平，沿气管后缘经上纵隔，过横膈的食管裂孔止于胃的贲门

有关SARS肺的病理特点，错误的是(　　)

定期租船条件下，船东、租船人分别负责()。

(2018·河北)为当“三好学生”而学习，是一种内部学习动机。()

凯恩斯主义

文中的“三次和两次”是指。根据原文所给的信息，以下各项正确的是。

下列选项中，属于民族自治地方自治机关自治权的是()

What is the one reason astronomers make long time exposures?

专业英语四级

WhichofthefollowingisNOTmentionedinthenews?

What’sthefirststeptogettingajobinterview?Gettingpasttherecruiter.Recruitersareusuallyyourfirstcontactwithap

BilingualeducationiscontroversialintheUnitedStates.【C1】______,agrowingbodyofresearchshowsthat【C2】______speakingt

ThedevelopmentofJamestowninVirginiaduringthesecondhalfofthe17thcenturywascloselyrelatedtothemakinganduseof

Itisrareforataleofacademicmismanagementinasmallinstitutiontograbnationalattention.ButSciences-Poisnoordinar

Thedrugsmust______ineverywaytothestandardssetupbythegovernment.

Thenovelcontainssomemarvelouslyrevealing______ofrurallifeinthe19thcentury.

Wetriedtosettletheproblemwiththemassoonaspossible,buttheyseemedto______sincerity.

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