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
2024-06-10
55
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、The number of sun flares.
B、The heat of the sun.
C、The sunspot cycle.
D、The weather.
答案
A
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3627523.html
相关试题推荐
[originaltext]Sincethefirstprehistoricartistdrewthefirstpictureson
[originaltext]Sincethefirstprehistoricartistdrewthefirstpictureson
[originaltext]AnewschoolyearhasbeguninAmerica.Butsomechildrendo
[originaltext]Goodafternoon.IwanttothankProfessorJonesforgivingme
[originaltext]M:Look,I’msorryIdidn’tturnupforthematchyesterday,but
[originaltext]M:Look,I’msorryIdidn’tturnupforthematchyesterday,but
[originaltext]M:Look,I’msorryIdidn’tturnupforthematchyesterday,but
[originaltext]M:Look,I’msorryIdidn’tturnupforthematchyesterday,but
[originaltext]M:Look,I’msorryIdidn’tturnupforthematchyesterday,but
[originaltext]Manychildrenfirstlearnthevalueofmoneybyreceivingan
随机试题
Readthetextbelowabouthowtodenycustomers’claims.Inmostofthelines(3
[originaltext]M:Hi,Ann!Welcomeback!HowwasyourtriptotheStates?W:Ver
Thewordengineerasanounmeans"apersontrainedinabranchofengineering"
[originaltext]W:Someofustrytoeatawaytheblues,nutritionistJoyBaueris
SomepeoplewouldsaythattheEnglishman’shomeisnolongerhiscastle,th
关于国家对数字出版产品的管理,说法正确的是()。A.导向正确是对数字出版产
平衡计分卡将评价的视线范围由传统的只注重企业内部评价,扩大到企业外部,包括()。
1.西柏坡,原是河北省平山县一个普通的小山村,群山环绕,滹沱河从村前流过,两岸滩
一般资料:男,32岁,已婚.部门经理。求助问题:开会发言紧张,伴失眠两个月。案例
在使用内部报酬率法进行固定资产投资决策时,方案可行的标准是内部报酬率要()。A
最新回复
(
0
)