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
2023-07-11
15
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] 【S3】
选项
答案
M
解析
从做题技巧看,只有M)orbit和E)track可选;从句意判断,“绕着太阳的地球轨道”应该是orbit(天体轨道),而不是track(轨迹,跑道)。
转载请注明原文地址:https://tihaiku.com/zcyy/2827217.html
相关试题推荐
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
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
随机试题
杭州位于中国东南沿海,位于京杭大运河(Beijing-HangzhouGrandCanal)的南端,它以其西湖的美丽景观而为人们所熟知。俗话说:“上
PASSAGETWO[br]What’stheauthor’ssuggestioninthelastparagraph?Helpyour
某信息系统审计人员被指派负责应用系统的后期复核。以下哪一项将可能损害其独立性?(
简述学校德育工作中贯彻尊重学生与严格要求学生相结合原则的基本要求。
班主任工作中的个别教育工作的教育对象是()A.优等生 B.后进生
某多层刚性方案砖砌体教学楼,其局部平面如题图所示。墙体厚度均为240mm,轴线均
2020年是极不平凡的一年,我们历经磨难,也见证奇迹。尤其在航天科技领域屡创佳绩
__________是指个体在学习活动中感到有某种欠缺而力求获得满足的心理状态,
在均值方差模型巾,如果不允许卖空,由两种风险证券构建的证券组合的可行域()A:
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)