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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
FEMA faces tough questions
Gold hits one-week high
US shuts Kyiv embassy
CA wage measure rejected
MX gray wolf found dead
'Bomb cyclone' hits US
OKs landmine aid to UKR
LA 'sanctuary city' ordinance
Loses at the Davis Cup
Education secretary pick
TX board backs Bible lessons
Super Heavy Starship launch
Hush money case delayed
Inter Miami coach resigns
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Atmospheric river alert
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Iran's uranium stockpile
5 Brazilian officers arrested
Suit over streaming issues
Liam Payne’s funeral
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Police officers shot in KY
Lakers to honor Pat Riley
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