While Venus and Mercury have no moons, Mars has two, while Saturn and Jupiter have more than 60 each.

尽管金星和水星没有卫星，火星却有两个卫星，更别提各有超过60个卫星的土星和木星。

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But Saturn's fellow gas giant planet Jupiter has four big moons.

而和土星同样是巨大气质行星的木星却有4颗大卫星。

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The planet Jupiter has nine moons.

木星有九颗卫星。

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Of course Galileo made great use of the telescope, and his discoveries--that Jupiter has its own moons, that the Milky Way is made of stars, that Venus has phases just like the moon--were turning points.

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But the best reason that we have to believe in the moons of Jupiter is that no one has to be prepared to die for them in order for them to be real.

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Galileo, which has spent the past two years studying Jupiter and its four largest moons, will now concentrate on Europa's icy crust.

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