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
18
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] 【S10】
选项
答案
L
解析
根据句意判断,本句前半部分使用了“实际亮度(actual bright- ness)”,后面填入的词应该是“actual”的比较对象,综观各选项,L)apparent(表面的)符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/2827224.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
[originaltext]M:Hey,Linda!Longtimenosee!Iheardthatyou’regoingonab
Themosttechnologicallyadvancedsocietieshavebeenresponsibleforthegreate
Goodafternoon,folks.Today’stopicis"TryJoggingforFitness".Whenwer
Goodmannersandetiquette(礼仪)arenotcomplicated.Anyonecan【D1】______cour
根据《城市房地产管理法》规定,下列哪项不属于设立房地产开发企业的条件?()A
地理数据具备的三个基本特征是()。A.空间特征、属性特征和时间特征 B.空
衝量企业最大化股东财富能力的比率是()A.销售利润率 B.净资产收益率 C
生理活性的钙是指A.蛋白结合钙B.柠檬酸钙C.碳酸钙D.总钙E.离子钙
环保不是负担,而是创新的______,可以促进竞争、产生就业、拉动经济。政府应当
正确操作对锅炉的安全运行至关重要,尤其是在启动和点火升压阶段,经常由于误操作而发
最新回复
(
0
)