段落1
This is Scientific American 60-Second Science. I'm Julia Rosen. Got a minute?
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Water. Earth has loads of H2O. But did it always?
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This question has plagued scientists for decades.
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Conventional wisdom has it that the Earth formed without any water.
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Then meteorites carrying water smashed into the planet, dumping their precious cargo.
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But now, a team of geologists has challenged this idea.
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They say water may have been here from the start.
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The scientists discovered that the chemical signature of water on Earth matches the signature of water in an ancient group of asteroids called eucrites.
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These bodies formed just a few million years after the birth of the solar system.
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And because Earth and eucrites seem to share the same source of water, the reasoning goes, Earth must have gotten its water around the same time the eucrites did, which has big implications.
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"Because Earth grabbed its water early, really the whole inner solar system got its water early,
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it means that planets, once they fully formed and got cool enough that water would be stable on the surface, they could be habitable."
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The Woods Hole Oceanographic Institution's Adam Sarafian, who led the research.
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"It wasn't like these planets are just waiting around, looking at their watches, saying, 'Where's the water? Life's ready to go, we just need water here.'
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So it pushes the date at which planets can become habitable back.
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And we need to go back to the drawing board on how planets are built and how water survives large impacts."
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Thanks for the minute, for Scientific American 60-Second Science. I'm Julia Rosen.
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1 / 17
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显示原文 =This is Scientific American 60-Second Science. I'm Julia Rosen. Got a minute?
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2 / 17
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显示原文 =Water. Earth has loads of H2O. But did it always?
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3 / 17
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显示原文 =This question has plagued scientists for decades.
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4 / 17
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显示原文 =Conventional wisdom has it that the Earth formed without any water.
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5 / 17
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显示原文 =Then meteorites carrying water smashed into the planet, dumping their precious cargo.
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6 / 17
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显示原文 =But now, a team of geologists has challenged this idea.
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7 / 17
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显示原文 =They say water may have been here from the start.
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8 / 17
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显示原文 =The scientists discovered that the chemical signature of water on Earth matches the signature of water in an ancient group of asteroids called eucrites.
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9 / 17
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显示原文 =These bodies formed just a few million years after the birth of the solar system.
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10 / 17
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显示原文 =And because Earth and eucrites seem to share the same source of water, the reasoning goes, Earth must have gotten its water around the same time the eucrites did, which has big implications.
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11 / 17
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显示原文 ="Because Earth grabbed its water early, really the whole inner solar system got its water early,
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12 / 17
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显示原文 =it means that planets, once they fully formed and got cool enough that water would be stable on the surface, they could be habitable."
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13 / 17
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显示原文 =The Woods Hole Oceanographic Institution's Adam Sarafian, who led the research.
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14 / 17
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显示原文 ="It wasn't like these planets are just waiting around, looking at their watches, saying, 'Where's the water? Life's ready to go, we just need water here.'
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15 / 17
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显示原文 =So it pushes the date at which planets can become habitable back.
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16 / 17
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显示原文 =And we need to go back to the drawing board on how planets are built and how water survives large impacts."
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17 / 17
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Julia Rosen.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞