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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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The Russian city of Chelyabinsk had a rude awakening early on February 15th when a meteor exploded overhead.
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The blast wave shattered windows and injured an estimated 1,000 people.
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Based on preliminary evidence from infrasound stations built to monitor nuclear tests, this looks to be an historic event.
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"We know that the energy of the explosion was about 300 kilotons of TNT equivalent."
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Margaret Campbell-Brown, a professor who studies meteoroids at the University of Western Ontario.
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"So it was a very, very powerful explosion.
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It was the biggest explosion from a meteor that we've seen in the atmosphere since 1908, since the 1908 Tunguska impact."
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The cause appears to be an asteroid, which Campbell-Brown estimates was 15 meters across.
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Objects of that size are expected to hit Earth only once every half-century or so.
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And impacts over cities of more than one million people such as Chelyabinsk are rarer still.
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"When you consider all the areas of the Earth that are uninhabited--the oceans, the ice caps, the deserts and so on,
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it's very surprising that this happened over such a populated area. Very unlucky."
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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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1 / 14
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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 / 14
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显示原文 =The Russian city of Chelyabinsk had a rude awakening early on February 15th when a meteor exploded overhead.
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3 / 14
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显示原文 =The blast wave shattered windows and injured an estimated 1,000 people.
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4 / 14
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显示原文 =Based on preliminary evidence from infrasound stations built to monitor nuclear tests, this looks to be an historic event.
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5 / 14
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显示原文 ="We know that the energy of the explosion was about 300 kilotons of TNT equivalent."
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6 / 14
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显示原文 =Margaret Campbell-Brown, a professor who studies meteoroids at the University of Western Ontario.
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7 / 14
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显示原文 ="So it was a very, very powerful explosion.
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8 / 14
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显示原文 =It was the biggest explosion from a meteor that we've seen in the atmosphere since 1908, since the 1908 Tunguska impact."
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9 / 14
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显示原文 =The cause appears to be an asteroid, which Campbell-Brown estimates was 15 meters across.
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10 / 14
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显示原文 =Objects of that size are expected to hit Earth only once every half-century or so.
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11 / 14
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显示原文 =And impacts over cities of more than one million people such as Chelyabinsk are rarer still.
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12 / 14
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显示原文 ="When you consider all the areas of the Earth that are uninhabited--the oceans, the ice caps, the deserts and so on,
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13 / 14
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显示原文 =it's very surprising that this happened over such a populated area. Very unlucky."
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14 / 14
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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：∞