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This is Scientific American's 60-Second Space, I'm John Matson. Got a minute?
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Back in 1958, at the dawn of the space age, physicist James Van Allen discovered that the Earth is ringed by high-energy charged particles.
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Held in place by the planet's magnetic field, these bands of radiation were named the inner and outer Van Allen Belts.
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They're of particular interest to NASA as they pose a potential danger to spacecraft.
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Now a NASA mission also named for Van Allen has found something new about his belts.
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By looping through them repeatedly, the twin Van Allen Probes discovered a third band of radiation.
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Or at least there were three.
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The two spacecraft uncovered the previously unknown structure in September.
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It consisted of fast-moving electrons, situated between the two previously known Van Allen belts.
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The discovery was reported in the journal Science.
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But the new structure is no longer.
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Four weeks after the probes found it, the third ring was wiped out by a strong shock wave emanating from the sun.
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Still, the unexpected finding shows that the Van Allen belts are more complex and variable than had been assumed.
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And that seemingly well-established knowledge about space still may have the capacity to surprise.
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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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1 / 15
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显示原文 =This is Scientific American's 60-Second Space, I'm John Matson. Got a minute?
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2 / 15
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显示原文 =Back in 1958, at the dawn of the space age, physicist James Van Allen discovered that the Earth is ringed by high-energy charged particles.
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3 / 15
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显示原文 =Held in place by the planet's magnetic field, these bands of radiation were named the inner and outer Van Allen Belts.
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4 / 15
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显示原文 =They're of particular interest to NASA as they pose a potential danger to spacecraft.
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5 / 15
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显示原文 =Now a NASA mission also named for Van Allen has found something new about his belts.
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6 / 15
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显示原文 =By looping through them repeatedly, the twin Van Allen Probes discovered a third band of radiation.
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7 / 15
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显示原文 =Or at least there were three.
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8 / 15
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显示原文 =The two spacecraft uncovered the previously unknown structure in September.
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9 / 15
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显示原文 =It consisted of fast-moving electrons, situated between the two previously known Van Allen belts.
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10 / 15
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显示原文 =The discovery was reported in the journal Science.
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11 / 15
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显示原文 =But the new structure is no longer.
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12 / 15
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显示原文 =Four weeks after the probes found it, the third ring was wiped out by a strong shock wave emanating from the sun.
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13 / 15
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显示原文 =Still, the unexpected finding shows that the Van Allen belts are more complex and variable than had been assumed.
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14 / 15
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显示原文 =And that seemingly well-established knowledge about space still may have the capacity to surprise.
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15 / 15
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显示原文 =Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞