恒星周期，英文名是Sidereal period，指太阳系天体完成公转一周的时间。
作为银河系最密集的一部分，大量恒星周期性诞生消亡产生了这些尘埃。
Being such a crowded part of the Galaxy, there have been many cycles of starbirth to produce such dust.
科学家今天宣布，当我们的恒星脱离最近的太阳黑子活动周期时，太阳最有可能进入冬眠。
When our star drops out of its latest sunspot activity cycle, the sun is most likely going into hibernation, scientists announced today.
每隔10天的周期就会有一些特殊的恒星群出现，这些恒星群被称为 decans。
Each period of ten days was marked by the appearance of special groups of stars called decans.
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