太阳辐射输出完成了十一年的周期，高峰期出现大量的太阳黑子。
Solar output goes through 11-year cycles, with high Numbers of sunspots seen at their peak.
导致冰河期形成的可能原因包括：大陆的位置，地球轨迹的变化，太阳辐射的输出，以及火山的作用。
Suggested causes of ice age periods include the positions of the continents, variations in the Earth's orbit, changes in the solar output, and Vulcanism.
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