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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
Habitat protections plan
Wins reelection after recount
Cybertruck crash kills 3
Concedes in CA House race
NM man awarded $412M+
Settles harassment lawsuit
Stowaway found on flight
'City under the ice'
Costco recalls eggs
Meets Trump at Mar-a-Lago
Residents sue Givaudan
China probes top official
X claims Infowars accounts
Man freed, gets $13M award
Jan. 6 coverage suit tossed
UKR energy sector attacked
Retires after 14 seasons
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AU passes social media ban
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Asthma attack treatment
Capitol Hill visit on Dec 5
Menendez seeks new trial
Abortions fell 2% in 2022
US economy expanded
Travel advisory downgraded
Weekly jobless claims fall
Court upholds TX razor wire
Thanksgiving in space
Bail denied by third judge
Ohtani seeks baseball cards
Picked as envoy for UKR, RU
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