首页
登录
职称英语
[originaltext] Astronomers are still learning about sunspots and about their
[originaltext] Astronomers are still learning about sunspots and about their
游客
2023-09-13
89
管理
问题
Astronomers are still learning about sunspots and about their effects on us, but believe that the spots on the sun, which were first observed through a telescope by Galileo in 1610, are electrical in nature.
Sunspots vary in size from what appear to be small specks on the sun’s surface, to at least 90,000 miles long, and 200,000 miles in length, and are visible on most clear days.
When sunspots release their electrical energy, they shoot beams of negatively charged electrons into space, some of which escape into the Earth’s atmosphere. These electrons create electrical effects, such as the aurora borealis, or Northern Lights, cause the disruption of radio transmissions, and increase the amount of ozone in the upper atmosphere. The additional ozone may absorb more than the usual amount of the sun’s heat, which in turn may affect our weather.
The sunspot cycle, is a recurring 11-year period over which the number of sunspots fluctuates and corresponds to the number of sun flares. An increase in the number of sun flares leads to an increase in the number of sunspots, and a decrease in the number of sun flares leads to a decrease in the number of sunspots,
Records of sunspots have only been kept for the last 100 years or so, leaving astronomers with little to back their research and much yet to discover about this phenomenon.
选项
A、They were created by Galileo in 1610.
B、They are electrical in nature.
C、They are created by nature.
D、They are there for almost thousands of years.
答案
B
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3011255.html
相关试题推荐
[originaltext]By1862telegraphcommunicationslinkedSanFranciscowithea
[originaltext]W:Goodmorning.ThisisMrs.Jackson.MayIpleasespeakwithDr
[originaltext]W:Goodmorning.ThisisMrs.Jackson.MayIpleasespeakwithDr
[originaltext]M:Hello,Mrs.Kelly.I’dliketopickupmytest,please.W:Sur
[originaltext]M:Hello,Mrs.Kelly.I’dliketopickupmytest,please.W:Sur
[originaltext]RobertEdwardswasblindedinanautomobileaccidentnineyea
[originaltext]RobertEdwardswasblindedinanautomobileaccidentnineyea
[originaltext]RobertEdwardswasblindedinanautomobileaccidentnineyea
[originaltext]Atonetimeitwasthemostimportantcityintheregion—abu
[originaltext]Atonetimeitwasthemostimportantcityintheregion—abu
随机试题
•Readtheadviceaboutcooperation.•Choosethebestwordtofilleachgap,from
Whatdoestheword"bogus"(Line2)mostprobablymean?[br]TheSouthKoreante
不符合急性鼻炎的症状是:()A.发热、头痛 B.鼻塞及嗅觉障碍 C.流水
关于工程建设其他费用中场地准备及临时设施费的内容,下列说法中正确的是()。A:
简述如何培养学生的体育学习策略?
(2016年)随着复利次数的增加,同一个名义年利率求出的有效年利率会不断____
下列关于格式刷功能的说法,正确的是()A.可以复制文字字符内容 B.可以复制
勘察、设计工作内容变更的原因一般包括( )。A.勘察、设计人工作失误引起的变更
在正常使用条件下,房屋建筑主体结构工程的最低保修期为( )。A.建设单位要求的
施工合同通用条款中要求进度付款申请单的主要内容包括()A.累计扣除的质量保
最新回复
(
0
)