描述: 木卫一是围绕木星运行的一颗卫星，由伽利略·伽利莱于1610年发现。它是木星四颗最大的卫星中距离木星最近的一个。木卫一每42.5小时绕木星运行一周，距离木星约422,000公里。由于在绕木星运行时受到强烈的潮汐力作用，木卫一表面有许多活跃的火山。

相关词条

• 伽利略卫星
• 木星

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