Last is the exosphere, which is the outermost layer of the atmosphere.
后是散逸层，这是大
外层。
层,外逸层
;
;
星;星;;
;;Last is the exosphere, which is the outermost layer of the atmosphere.
后是散逸层，这是大外层。
Europa, Ganymede, and Callisto all provide evidence of a thin atmospheric layer known as a 'surface-bound exosphere'.
木卫二、木卫三、木卫四都被证实了有一层很薄大层。
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