An eclipse happens when the earth and moon are in line with the sun.

地球和月亮与太阳处在一条直线上，日食就发生了。

《牛津词典》

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The moon is a satellite of earth.

月球是地球的卫星。

《牛津词典》

He also produced the thirteen-part series, "From the Earth to the Moon" because of his support for human space travel.

VOA: special.2011.06.17

That was when men from Earth -- American astronauts flew their Apollo Eleven spacecraft to the moon, landed and returned home safely.

VOA: special.2009.07.29

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

"We'll be keeping an eye out for signs of a repeat performance next year when the Earth-moon system passes through the same region of space, " Cooke said.

CNN: Bright explosion on moon visible from Earth, NASA says

In their paper, the co-authors argue that gravitational tidal heating caused by the gravitational friction of an earth-like exo-moon on an eccentric orbit around a Jupiter-like planet lying at a Jupiter-like distance from its parent star, could, in fact, create habitable conditions.

FORBES: Earth-Like Exo-Moons Can Lurk Well Beyond Planetary Habitable Zones, Say Astronomers

On the moon, we had one-sixth of Earth's gravity, allowing Neil and me to move around easily in the Eagle to put on equipment for our walk.

WSJ: Buzz Aldrin on His Lunar Home, the Eagle