Increases in the amount of cosmic or terrestrial dust in the stratosphere could also increase the number of brightly shining clouds.
宇宙或地面尘土的增加也可能增加明亮光云的数量。
Polar mesospheric, or noctilucent ("night shining"), clouds usually are seen at twilight, following the setting of the sun below the horizon and darkening of Earth's surface.
极地气层云，或者说晚霞，通常是那些在黎明前看到的云朵，伴随着地平线以下落幕的太阳和黑暗的地球表面。
Analogous to a sundog or parhelion, the paraselene is produced by moonlight shining through thin, hexagonal-shaped ice crystals in high cirrus clouds.
类似于假日或幻日，近幻月是月光透过高空卷云中的六角形的薄冰晶而形成的。
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