NASA's Hubble Space Telescope caught Jupiter's moon, Ganymede, seemingly playing a game of peek-a-boo in this image in April 2007.

2007年4月，NASA 的哈勃空间望远镜捕捉到木星的月亮——Ganymede——的踪迹，看起来像是正在玩躲猫猫的游戏。

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Ganymede, the largest moon in the solar system, has a dirty ice surface cut by fractures and peppered by impact craters.

这颗太阳系中最大的卫星，表面冰盖布满断层的切口和火山灰的粉末。

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NASA's Hubble Space Telescope caught Jupiter's moon, Ganymede, seemingly playing a game of peek-a-boo in this image from April 2007.

2007年4月，NASA的哈勃空间望远镜捕捉到木星的月亮——Ganymede——的踪迹，看起来像是正在玩躲猫猫的游戏。

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It also found that Ganymede, the largest moon in the solar system, has a magnetic field.

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The existence of a magnetic field on Ganymede, the biggest moon of Jupiter.

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And water would be all the more exciting on Ganymede because it is the largest moon in the solar system (larger even than the planets Mercury and Pluto) and, like earth, it has a permanent magnetic field that protects part of its surface from bombardment by certain sorts of life-destroying radiation.

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