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
24
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] 【S4】
选项
答案
D
解析
根据语境判断。前半句指在两个不同时间观看,推断有差异;下一句有明确的提示“different angles”。
转载请注明原文地址:https://tihaiku.com/zcyy/2827218.html
相关试题推荐
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecou
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecou
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecou
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecou
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecou
[originaltext]Someofthemostinterestingbuildingsintheworldarethep
[originaltext]Someofthemostinterestingbuildingsintheworldarethep
Spidershaveexcellenteyesightandcanseetheir__________fromadistancetwe
A、Thepublictelephonesoftengowronginmaltingalongdistancecall.B、Itis
Domesticviolenceisaseriouscrimecausingserioussocialproblems.Itis
随机试题
Holidaysarecelebratedforallsortsofreasons.Somehonorheroes,others
HowtoBeEffectiveReadersI.Introductionofreadingandhowtobeeffectiver
Contrarytopopularbelief,"fallingstars"arenotstarsatall,butarem
Afolkcultureissmall,isolated,cohesive,conservative,nearlyselfsuffi
根据宪法的规定,我国社会主义法律分为基本法律和非基本法律两类。()
某制造公司在其生产过程中需使用大量的低值易耗品,如螺母、螺栓、垫圈、手套等。当这
入院患者可暂免沐浴的情况是A.急性甲型肝炎患者 B.高血压患者 C.糖尿病患
根据《历史文化名城名镇名村保护条例》的规定,对历史建筑进行外部修缮装饰、添加设施
下列导致固定资产建造中断时间连续超过3个月的事项,不应暂停借款费用资本化的是(
患者,男,55岁。饮酒后出现上腹持续性刀割样痛3小时,向腰背部放射,伴恶心、反复
最新回复
(
0
)