首页
登录
职称英语
It turns out that measuring the distance to a star is an interesting problem
It turns out that measuring the distance to a star is an interesting problem
游客
2024-02-12
41
管理
问题
It turns out that measuring the distance to a star is an interesting problem! Astronomers have【S1】______up with two different techniques to estimate how far away any given star is.
The first【S2】______uses triangulation(三角测量). The Earth’s【S3】______around the sun has a diameter of about 186 million miles(300 million kilometers ). By looking at a star one day and then looking at it again 6 months later, an astronomer can see a【S4】______in the viewing angle for the star. With a little trigonometry(三角学), the different angles yield a distance. This technique【S5】______for stars within about 400 light years of earth.
There is no direct method currently【S6】______to measure the distance to stars【S7】______than 400 light years from Earth, so astronomers instead use brightness measurements. It turns out that a star’s color spectrum is a good indication of its actual brightness. The【S8】______between color and brightness was proven using the several thousand stars close enough to earth to have their distances【S9】______directly. Astronomers can therefore look at a distant star and determine its color spectrum. From the color, they can determine the star’s actual brightness. By knowing the actual brightness and comparing it to the【S10】______brightness seen from Earth(that is, by looking at how dim the star has become once its light reaches Earth), they can determine the distance to the star.
A)capable B)works
C)put D)difference
E)track F)come
G)relationship H)available
I)technique J)measured
K)nearer L)apparent
M)orbit N)applies
O)farther [br] 【S8】
选项
答案
G
解析
可见在D)和G)之间判定。两者均可用于本句搭配,但本句探讨的是色彩和亮度之间的关系,而非差异。再者,如果本题填D),那么第50题将没有着落。
转载请注明原文地址:https://tihaiku.com/zcyy/3443488.html
相关试题推荐
Doctorsshouldkeepquietandletpatientsexplaintheirproblems__________(而不是去
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
随机试题
PlayJazzFestivalTicketsTobuyPlayJazzFestivalticketsonline,pleasesele
HadIknowntheresult,I______youtotellme.A、wouldnotaskB、wouldnothavea
Indiaistheworld’sbiggestgoldconsumer,butthecountry’spassionforth
Overthepastcentury,allkindsofunfairnessanddiscriminationhavebeen
下列不属于中央银行货币政策的工具的是()。A.公开市场操作 B.通货膨胀的抑
避险策略基金投资于稳健资产不得低于基金资产净值的(),以获取稳定收益,尽力避免
有关正常粪便的组成,下列叙述错误的是A.可有淀粉颗粒B.可有植物细胞C.无细菌D
保险中介人主要包括()。A.保险代理人 B.保险经纪人 C.
(2020年真题)污染影响型建设项目土壤环境污染源类型包括()。A.大气沉
(2010年真题)根据《环境影响评价技术导则-声环境》,关于声环境影响评价范围,
最新回复
(
0
)