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cover of episode Origins: How did Earth get its water?

Origins: How did Earth get its water?

2023/3/1
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Unexplainable

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Lydia Hallis
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Noam Hassenfeld
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Lydia Hallis: 地球早期温度极高,液态水难以存在,因此地球水的来源一直是科学难题。传统理论认为地球水来自太阳系外围的冰冷天体(如彗星)撞击地球。但通过分析水中的氢同位素比例,发现地球水的氢同位素比例与彗星不符。另一种理论认为木星和土星的迁移导致富含水的小行星被带入内太阳系,并与地球发生碰撞,从而为地球带来水。然而,她质疑了地球形成后才获得水的传统假设,提出地球原始物质中就存在水的可能性。她在加拿大巴芬岛的古老岩石中发现了原始水,这些水被锁在橄榄石晶体内的玻璃珠中。她发现这些岩石中的氢同位素比例与太阳的匹配,这表明地球的部分水可能直接来自太阳。太阳风中的氢与地球岩石中的氧结合,可以形成水,并被锁在岩石内部。太阳风在太阳系早期就可能将水注入到岩石中,这些岩石后来成为地球的一部分。即使地球早期就存在一部分水,小行星撞击也可能带来了额外的水。如果她的理论正确,那么水可能在宇宙中普遍存在,这将大大增加在其他星球上发现水的可能性,进而增加发现生命的可能性。越来越多的证据表明,水在宇宙中普遍存在,这对于生命起源的研究具有革命性意义。 Noam Hassenfeld: 地球上水的来源是理解生命起源的关键问题,因为水是生命存在的基础。探索地球水的来源,有助于我们理解生命起源的可能性,以及生命在宇宙中的普遍性。

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The episode explores the mystery of Earth's water origin, questioning how a planet that was once a molten mass could have become the water-rich environment it is today.

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Life as we know it needs water, but scientists can’t figure out where Earth’s water came from. Answering that question is just one piece of an even bigger mystery: “Why are we here?”

This is the first episode in our new three-part series, Origins), about the beginnings and boundaries of life on Earth.

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