Dark Forces Dominate Universe
The earth.moon.sun and all visible stars in the sky make up less than one percent of the universe.Almost all the rest is dark matter and dark energy,unknown forces that ______astronomers.
Observations in recent years have changed the basic______ of how the universe evolved and have indicated how little is known about the major forces and substances that______ our world Astronomers now know that luminousmatterstars,planets and hot gas----Accounts ______ only about 0,4 percent of the universe.Non-luminous components,such as black holes and intergalacticgas,______ up 3.6 percent The rest is either dark matter , about 23 percent,or dark energy,about 73 percent.
Dark matter.Sometimes ______ cold dark matter,has been known for some time.Only recently have researchers come to understand the key role it ______ formation of stars,planets and even people.
We ______ our very existence to dark matter, said physicist Paul Steinhardt and a co-author of a review on dark matter which ______ not long ago in the journal Science.
Dark matter dominated the structure in the early universe,Steinhardt said。For the first few billion years dark matter contained most of the mass of the universe You can think of ordinary matter a frothof an ocean of dark matter.The darkmatter dumpsand the ordinary matter falls into it.That to the formation of the stars and galaxies.Without dark matter , there would be virtually no structures in the universe
The nature of dark matter is ______ It cannot be seen or detected directly
Astronomers know it is there because of its______ on celestialobjects that can be seen and measured.
But the most dominating force of all in the universe is called dark energy, a recently ______ power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.
51 A worry B move C puzzleD reject
52 A understanding B value C pattern D structure
53 A changedB described C designed D shaped
54 A in B for C ofD to
55 A make B keep C set D get
56 A written B called C identified D seen
57 A signed B stressed C acted D played
58 A believe B owe C feel D regard
59 A appearedB carriedC published D contributed
60 A elementB shape C formation D power
61 A with B as C form D beside
62A turned B workedC led D attempted
63 A unknow B interesting C different D visible
64 A form B outcome C effect D source
65 A seized B provenC caught D grasped
【英语启蒙】大家一起学发音:[l]该怎么发
【英语启蒙】大家一起学发音:[au]该怎么发
幼儿英语日常用语:课堂集体活动(Teaching Activities)
幼儿英语日常用语:午休(Having a Nap)
少儿英语日常英语口语:你去过杰克了吗?
【英语启蒙】大家一起学发音:[ɔi]该怎么发
少儿英语日常英语口语:我不能告诉你
少儿英语日常英语口语:游乐园
少儿英语英语情景对话练习:你要吃一些
英语口语8000句文本:第1部分 在家中、第2/3部分 请医生看病、第4部分 恋爱和结婚
幼儿英语日常用语:活动结束(Ending Activities)
英语口语8000句:第7部分 日期与时间
英语口语8000句:第14部分 吐露真情
【英语启蒙】大家一起学发音:[əu]和[ai]该怎么发
英语口语8000句:第9部分 随意谈话
【英语启蒙】大家一起学发音:[ei]该怎么发
幼儿英语日常用语:游戏及活动用语(Games or Activities)
英语口语8000句:第15部分 各种问题
【英语启蒙】大家一起学发音:[i]该怎么发
少儿英语日常英语口语:爬山
少儿英语英语情景对话练习:我很赶时间
英语口语8000句:第6部分 打电话
幼儿英语日常用语:进餐用语(Dining)
少儿英语日常英语口语:我可以帮你吗?
幼儿英语日常用语大全
英语口语8000句:第12部分 商谈
【英语启蒙】大家一起学发音:[iə]该怎么发
幼儿英语日常用语:晨间活动(Morning Activities)
幼儿英语日常用语:离园(Leaving)
【英语启蒙】大家一起学发音:[εə]该怎么发
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |