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探寻地球的起源:地球是如何诞生的?
地球的诞生离不开太阳系的形成。大约在46亿年前,太阳系的形成始于一个巨大的分子云。这些分子云主要由氢、氦及少量重元素组成,经过重力的作用,逐渐坍缩形成了一个旋转的盘状结构。
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今日热点
Files for bankruptcy
Transportation secretary pick
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Enters race for DNC chair
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Russian ballet star dies
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Win WNBA draft lottery
Huckabee's Meta suit tossed
Settler group sanctioned
To cut workforce
‘One Tree Hill' actor dies
US opens two new probes
Border wall trial delayed
Thanksgiving holiday travel
Israeli strike hits Beirut
Giants bench Daniel Jones
G20 summit in Brazil
Calls for nuclear expansion
Human smuggling case trial
Suspended 5 games for hit
Adds new parental controls
Riley murder trial resumes
Moscow warns US
Windsor burglary probe
Former soldier sentenced
Russia vetoes UN resolution
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