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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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In planet formation, as in adolescence, you've got your late bloomers.
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Such is the case for a nearby star called TW Hydrae.
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At some three million to 10 million years of age, it's relatively old for a young star.
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That is, TW Hydrae formed much more recently than our sun but is past the point at which most fledgling stars are still encircled by a massive disk of dust and gas--the stuff of planet formation.
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But a new analysis shows that TW Hydrae retains a surprisingly hefty circumstellar disk, implying that the star could still be forming giant planets.
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The study appears in the journal Nature.
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Researchers from the U.S., Germany and the Netherlands pointed the European Space Agency's orbiting Herschel Space Observatory at TW Hydrae to investigate the star's disk.
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They detected levels of a heavy hydrogen molecule called hydrogen deuteride.
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From that measurement they were able to estimate the abundance of ordinary hydrogen, which makes up the bulk of the disk.
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The result: TW Hydrae still has enough raw material left to make 60 Jupiters or so, despite its maturity.
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For aging stars, then, perhaps 10 million is the new 30.
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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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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 / 13
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显示原文 =In planet formation, as in adolescence, you've got your late bloomers.
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3 / 13
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显示原文 =Such is the case for a nearby star called TW Hydrae.
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显示原文 =At some three million to 10 million years of age, it's relatively old for a young star.
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5 / 13
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显示原文 =That is, TW Hydrae formed much more recently than our sun but is past the point at which most fledgling stars are still encircled by a massive disk of dust and gas--the stuff of planet formation.
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显示原文 =But a new analysis shows that TW Hydrae retains a surprisingly hefty circumstellar disk, implying that the star could still be forming giant planets.
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7 / 13
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显示原文 =The study appears in the journal Nature.
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显示原文 =Researchers from the U.S., Germany and the Netherlands pointed the European Space Agency's orbiting Herschel Space Observatory at TW Hydrae to investigate the star's disk.
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9 / 13
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显示原文 =They detected levels of a heavy hydrogen molecule called hydrogen deuteride.
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10 / 13
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显示原文 =From that measurement they were able to estimate the abundance of ordinary hydrogen, which makes up the bulk of the disk.
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显示原文 =The result: TW Hydrae still has enough raw material left to make 60 Jupiters or so, despite its maturity.
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12 / 13
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显示原文 =For aging stars, then, perhaps 10 million is the new 30.
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13 / 13
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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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