The moon is a satellite of earth.

月球是地球的卫星。

《牛津词典》

If it is true, the mantle rocks of the Moon and the Earth should be the same geochemically.

如果这是真的，月球和地球的地幔岩石从地球化学上来看应该是相同的。

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Is the earth heavier than the moon?

地球比月球更重吗？

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They moved easily and quickly, because the moon's gravity is six times less than Earth's.

VOA: special.2009.07.15

And this is a very fast speed, of course, it's about 700 million miles per hour. So, one way to put that in perspective is to think about how long it takes for a light beam to get from earth to the moon. Does anyone have any guesses? Eight seconds, that sounds good.

当然这是一个非常快的速度，它大约是每小时7亿英里,为了更形象化，我们,看看光从地球到月球,需要多少时间，你们猜猜是多少？,8秒，猜的不错。

麻省理工公开课 - 化学原理课程节选

Also left forever on the moon is a sign with these words: "Here men from the planet Earth first set foot on the Moon July,nineteen sixty-nine A.D.

VOA: special.2009.07.15

That means its Goldilocks zone is so close to it that the planet may be tidally locked, as the moon is to the Earth.

ECONOMIST: Another Earth?

This supports models where the moon is derived from Earth materials that were ejected during a giant impact event early in solar system history.

FORBES: NASA Prepares To Crash Its Probes Into The Moon

The overall strength of the moon's gravity, as well as its differential (tidal) effect, is greatest when the moon is closest to the Earth, as on January 4, 1912.

CNN: The sun, the moon and the Titanic