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
27
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:http://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
Accordingtoscientists,youngpeople’stastebudsarenotreadyforthebit
HowmanyLondonundergroundlinesarethere?[br]Howmuchcheaperisatypical
CashPlusgivesyouextracashwhenyouneedit.Weallhavetimesinour
[originaltext]M:EnglishLanguageCenter.HowmayIhelpyou?W:Yes.I’mcalli
以下HFA指标中与卫生政策有关的是()A.国民生产总值 B.收入分配
2010及2011两年间,企业R&D经费投入金额约是高等院校的多少倍?A
证券公司应当根据客户()等情况,在与客户签订证券交易委托代理协议时,对客户进行初
某公司对某仪器的尺寸测量如图5-2所示,为测量尺寸lB,先采用卡尺测得尺寸lA和
运输企业的车辆维护工作应贯彻()的原则。A.强制维护 B.自愿维护 C.视情
2×18年2月15日,甲公司将一栋自用办公楼对外出租,年租金为360万元。当日,
最新回复
(
0
)