首页
登录
职称英语
The sun today is a yellow dwarf star. It is fueled by thermonuclear reaction
The sun today is a yellow dwarf star. It is fueled by thermonuclear reaction
游客
2023-12-27
6
管理
问题
The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface. [br] According to the passage, which of the following best describes the sequence of stages that the sun will probably pass through?
选项
A、Yellow dwarf, white dwarf, red giant, black giant.
B、Red giant, white dwarf, red dwarf, nova explosion.
C、Yellow dwarf, red giant, white dwarf, black dwarf.
D、White dwarf, red giant, black dwarf, yellow dwarf.
答案
C
解析
是非题型通读全文,可得出结论:太阳的演变过程是Yellow dwarf,red giant,white dwarf;black dwarf,所以C为答案。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3311094.html
相关试题推荐
Emotionisafeelingaboutorreactiontocertainimportanteventsorthough
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thereactionwasinstantandoverwhelming.Socialmediaexploded,radiophone-in
Kaganmaintainsthataninfant’sreactionstoitsfirststressfulexperiencesar
Amanwasplayingapianobeingpaintedpurpleandyellowandleftthereforthi
Thereactionwasinstantandoverwhelming.Socialmediaexploded,radiophone-in
随机试题
[originaltext](13)Agrowingnumberofwomenaredevelopingsomethingcalled
MinorityReportA)Americanuniversitiesareacceptin
A.双侧面部模糊不定的疼痛 B.牙龈部持续性钝痛 C.局部有压痛的持续性面部
以下哪些列入资产支持证券的基础资产负面清单( )A.投资标的为产权证书的信托计
根据所给材料,回答问题。 2011年末我国65岁及以上人口约比2010
A.疏风祛邪,宣肺止咳 B.泻肺清热,涤痰镇咳 C.养阴润肺,益气健脾 D
有关麻醉品、一类精神药品的管理错误的是A:处方医师需要持有单位所在区县卫生局颁发
朱砂的使用剂量是A.0.1~0.5g B.0.01~0.15g C.15~3
卫气的分布特点是( ) A.上出息道,下走气街 B.熏于盲膜,散于胸腹
治疗慢性痛风的药物中属于促进尿酸排泄的是A.丙磺舒 B.聚乙二醇尿酸酶 C.
最新回复
(
0
)