For four hours, it will be partly in the Earth's shadow.

在接下来的4个小时里，部分月球会处于地球的阴影下。

The moon literally can't get out of the Earth's shadow.

月球无法摆脱地球的阴影。

A lunar eclipse is when the moon passes through the earth's shadow.

月食是指月亮通过地球阴影时的景象。

This happened when the entire moon was in the Earth's shadow.

这发生在整个月球都处于地球阴影中的时候。

But every so often, that full moon happens right in the middle of Earth’s shadow.

但每隔一段时间，满月时的月亮会被地球投上阴影。

A penumbral eclipse is when the moon passes through the outskirts of the Earth's shadow.

月偏食是指部分月球穿过地球的本影。

That's a sun-synchronous orbit where the satellite tracks but never moves into the Earth's shadow.

这是一个太阳同步轨道，卫星在轨道上运行，但不会进入地球的阴影。

As the eclipse progresses, you will see more and more of the Earth's curved dark shadow.

随着月食的进行，你会看到越来越多的地球弯曲的阴影。

In a total lunar eclipse, the whole moon falls within the darkest part of Earth's shadow.

发生月全食时，月球整个进入地球黑暗的阴影中。

The American space agency NASA says the moon will move into the Earth's shadow on Friday night.

美国国家航空航天局（NASA）表示，月球将于周五晚间进入地球阴影中。

Sometimes, the moon passes along the edge of the Earth's shadow, a dim area called the penumbra.

有时，月球沿着地球阴影的边缘经过，这片昏暗的区域被称为半影。

A lunar eclipse happens when the moon passes through Earth's shadow as our planet goes around the Sun.

当月球穿过地球围绕太阳公转所产生的阴影部分时会发生月食。

With this panoramic view of the Sun, unobstructed by Earth's shadow, L1 is the perfect place for solar-observing satellites.

L1 不被地球遮挡，可见到太阳全景，是太阳观测卫星的理想地点。

RACHEL CRANE, CNN CORRESPONDENT (voice-over): A lunar eclipse is when the moon passes through the earth's shadow.

CNN 记者 Rachel Crane（画外音）：月食是指月球穿过地球阴影。

As the Moon passes into the central part of the Earth's shadow, called the umbra, it darkens dramatically.

当月球进入地球阴影的中心部分，即本影时，它会急剧变暗。

The tilt of the moon's orbit around the earth and which of the Earth's two shadows, the moon falls behind.

这包括月球绕地球轨道的倾斜度，以及月球落在地球两个影子中的哪一个后面。

A lunar eclipse occurs when the Moon passes through the Earth's shadow, blocking the sunlight that normally reflects off of it.

当月球穿过地球的阴影时，地球阻碍了本应由月球反射的太阳光，月食便发生了。

The umbra is the dark part of Earth's shadow in a lunar eclipse and the moon shadow in a solar eclipse.

本影是月食时地球阴影和日食时月球阴影的黑暗部分。

And a lunar eclipse is the opposite -- when the Earth’s shadow falls on the moon.

而月食恰恰相反——当地球的影子落在月球上时。

About twice a year, this puts the Moon in just the right position to pass through the Earth's shadow, causing a lunar eclipse.

每年大约有两次，这使月球处于正好穿过地球阴影的位置，导致月食。