木卫一：木星四颗最明亮的卫星之一，距木星的距离排为第九。它首先为伽利略所发现。
One of the four brightest satellites of Jupiter and the ninth in distance from the planet. It was first sighted by Galileo.
木卫一：木星四颗最明亮的卫星之一，距木星的距离排为第九。它首先为伽利略所发现。
One of the four brightest satellites of Jupiter and the ninth in distance from the planet. It was first sighted by Galileo.
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