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。
From Earth, we can only see one side of the moon.
从地球上，我们只能看到月球的一面。
The moon is a satellite of earth.
月球是地球的卫星。
The moon exerts a force on the earth.
月球对地球有引力。
The moon rolls about the earth.
月亮绕地球运行。
Is the earth heavier than the moon?
地球比月球更重吗？
The Earth-Moon system has always been perplexing.
地月系统一直令人困惑。
The moon revolves around the earth.
月球绕地球运行。
The moon is very far [distant] from the earth.
月球离地球很远。
Theoretically, it should because the moon was once part of Earth.
理论上，月球上应该有水，因为月球曾是地球的一部分。
Because if comets battered the moon, they probably hit the Earth, too.
因为如果彗星能够把水带到月球，同样很可能带到地球。
As it turns out, water on the moon is different from water on Earth.
正如研究结果显示的一样，月球上的水与地球上的水不同。
Thisphoto was the world's first view of Earth taken near the moon.
这是世界上第一张在月球附近看到地球照片。
During this period, the shadow of the Earth will slowly drift across the moon.
在这个过程中，地球的影子会缓慢飘过月亮。
With sun and moon, with earth and sea's rich gems.
有太阳月亮，山海诸珍奇。
The moon rotates around the earth.
月球围绕着地球旋转。
If we visited the moon, we should see the earth.
如果我们能去游览月球，我们就可以在那里看到地球。
But why does then the moon orbit the earth?
那么为什么月亮绕着地球转呢？
Orbit of the Moon, and we see the Earth.
月球的轨道，以及我们看到的地球。
From the Moon, Earth is an ideal reference point to calibrate the cameras.
从月球的角度，地球是一个理想的校准相机的参照点。
The moon invariably displays the same face to the earth.
月亮永远是用相同的一面向着地球。
Like the Earth, the moon has both a day and a night.
同地球一样，月球也同样有白天和夜晚。
They are the Sun, the Earth, the Moon and some other stars.
他们是太阳，地球，月亮和一些其他星星。
You can visit Earth again soon,and bring more people to the Moon colony.
你很快就可以再回到地球去。然后带更多的人到月亮部族去。
You can visit Earth again soon, and bring more people to the Moon colony.
你很快就可以再回到地球去。然后带更多的人到月亮部族去。
This is the first image ever taken of Earth from the surface of a planet beyond the Moon.
这是除月球之外，第一个从其它星球的陆地上拍摄地球的照片。
Juno traveled this distance, from the Earth to the Moon, in less than a day.
要走完地月之间的这段距离，朱诺探测器可花不了一天。
Sometimes the moon doesn’t completely fall into the shadow of the Earth, however.
有时候，月亮并没有完全进入地球的影子，这时候，只有一部分月亮变暗，我们将看到偏食。
Sometimes the moon doesn’t completely fall into the shadow of the Earth, however.
有时候，月亮并没有完全进入地球的影子，这时候，只有一部分月亮变暗，我们将看到偏食。
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