Europa, Ganymede, and Callisto all provide evidence of a thin atmospheric layer known as a 'surface-bound exosphere'.
卫二、卫三、卫四都被证实了有一层很薄的大气层。
Europa, Ganymede, and Callisto all provide evidence of a thin atmospheric layer known as a 'surface-bound exosphere'.
卫二、卫三、卫四都被证实了有一层很薄的大气层。
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