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太阳活动减弱令科学家不解
Tuesday, July 21, 2015 0:18
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几乎每隔一定时间,太阳会显露出我们所说的“太阳黑子”。其实这是一种剧烈的磁暴。由于它可能会对通讯、导航和电网产生不利影响,太空科学家密切观察这种现象。但是近两个太阳活动周期中黑子现象的减弱让科学家很…

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