• The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.

    磁场变化太阳这样恒星表面黑子活动周期根源尽管经过几十年认真研究之后,地球人仍然对其知之甚少。

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  • Every 22 years, the sun's magnetic field switches north and south, creating an 11-year sunspot cycle.

    太阳南北极二十二对调一次,由此产生长达十一年的太阳黑子周期。

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  • Every 22 years, the sun's magnetic field switches north and south, creating an 11-year sunspot cycle.

    太阳南北极二十二对调一次,由此产生长达十一年的太阳黑子周期。

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