Europa and Ganymede are moons of Jupiter.

Europa和Ganymede是木星的卫星。

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Using it, he first observed the moon in the fall of 1609, then the moons of Jupiter, and sunspots.

1609年夏天，伽利略曾第一次用它观察了月球，之后他还观察到了木星的卫星和太阳黑子。

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The named moons of the solar system outnumber planets by more than 20 to 1, and they display a remarkable diversity.

太阳系已命名的卫星数量和已命名的行星数量比例要大于20：1。

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It's what we'd use to go to, eventually,to Mars or to the moons of Mars."

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These mechanical devices that show the relative placement and movement of the planets and moons are sometimes called orreries.

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At first,he thought it was the shadow of one of Jupiter's four big moons.

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By tradition, the moons of Pluto have names associated with Hades and the underworld.

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Galilei discovered the moons of Jupiter in, mebbe 1608, 1610, something like that.

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This year, for example, the names Caliban and Sycorax were proposed for the 16th and 17th moons of Uranus.

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