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
30
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://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
FiveMainLiteraryMovementsinAmericanHistoryI.Transcendent
TipsforApplyingtoU.S.CollegesI.GeorgeMasonUniversit
下列几组药物中同服可以增进吸收的是()A:维生素B6与左旋多巴 B:苯巴比妥
紫杉醇是()。A:抗肿瘤金属配合物 B:抗代谢药物 C:抗肿瘤抗生素 D
A.病变局限于子宫 B.病变转移多个脏器 C.病变扩散,仍局限于附件、阴道及
从国际大环境来看,跨国纳税人可利用各国税收政策存在的( )和税收优惠差异等,进
证券公司应当为每个客户单独建立纸质或者电子档案,客户档案应当包括的内容有()。A
()是中央银行区别于普通商业银行的根本标志。A.独占货币发行权 B.独占货
按照费用构成要素划分的建筑安装工程费用项目组成,下列费用中属于建筑安装工程费中检
广播设备的接地应直接接至( )。A.铜排 B.等电位接地端子箱 C
最新回复
(
0
)