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
41
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/3627521.html
相关试题推荐
[originaltext]Sincethefirstprehistoricartistdrewthefirstpictureson
[originaltext]Sincethefirstprehistoricartistdrewthefirstpictureson
[originaltext]AnewschoolyearhasbeguninAmerica.Butsomechildrendo
[originaltext]Goodafternoon.IwanttothankProfessorJonesforgivingme
[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]Manychildrenfirstlearnthevalueofmoneybyreceivingan
随机试题
ToswimacrosstheEnglishChanneltakesatleastninehours.It’sahardwo
Thetowncovers1,200squarekilometersandhasapermanentpopulationof1,100,
下列属于出库凭证的是()。A.限额领料单 B.内部调拨单 C.借用单 D
哪些是肾脏分泌的生物活性物质()A.血管紧张素 B.前列腺素 C.促红细
血友病A是下列哪个凝血因子缺乏A.FⅧ B.FⅨ C.vWF D.FX
李某是向阳公司的发起人股东,公司成立后,李某抽逃出资额600万元,根据我国公司法
近年来,随着我国改革开放的深入和加入WTO后,我国汽车的价格一直呈现下降的趋势。
共用题干 张一、李二、王三因口角与赵四发生斗殴,赵四因伤势过重死亡。其中张一系
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
A.出入疫区的人员、物资和交通工具实施卫生检疫 B.停工、停业、停课 C.宣
最新回复
(
0
)