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Sun's fickle heart may leave us cold

作者:边荼盅    发布时间:2019-02-27 05:01:07    

By Stuart Clark There’s a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years – exactly the same period as between ice ages on Earth. So says a physicist who has created a computer model of our star’s core. Robert Ehrlich of George Mason University in Fairfax, Virginia, modelled the effect of temperature fluctuations in the sun’s interior. According to the standard view, the temperature of the sun’s core is held constant by the opposing pressures of gravity and nuclear fusion. However,

 

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