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
74
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://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
A.askforpermissionB.decreasepriceC.makeasuggestionD.make
•ReadthearticlebelowaboutthecentralproblemofEconomics.•Choosethebest
Theelementsofnaturemustbereckonedwithinanymilitarycampaign.Napoleon
Thenumberofexecutivebranchemployeesretiringthisfiscalyear,whichen
ThepresidentoftheUnitedStateshasoneofthetoughestjobsintheworld
TheLostArtofListeningA)"Whywon’theevenlistentomyidea?""Why
在结构化分析方法中,依据( )来进行接口设计。A.数据流图 B.实体-关系图
Thechangeinthatvillagewasmiraculou
(2017年真题)某女,55岁。患冠心病室性早搏3年,症见心悸不安,气短乏力,动
预算年度终了,企业财务管理部门应当向董事会或经理办公会报告预算执行情况。()
最新回复
(
0
)