If we mess up the earth gravity assist, we die.

如果地球引力助推搞砸了，我们会死。

Fast enough to escape earth's gravity and begin the shuttle era.

使其能以足够快的速度逃离地球引力，从此开始航天飞机时代。

Elsewhere study finds that spaceflight may pose health risks to anyone spending time beyond earth's gravity.

其他地方的研究发现，太空飞行可能会给任何在地球引力之外度过时间的人带来健康风险。

We watched, amazed as fire broke out on the outside of the spaceship as the earth's gravity increased.

我们惊奇地看着，宇宙飞船的外层燃烧起火，因为地球引力在逐渐增加。

Described as an enormous round plate, it spins slowly in space to imitate the pull of the earth's gravity.

太空站像一个巨大的圆盘，在太空中缓缓的旋转，以仿照出地球重心的引力。

We take on an estimated 40,000 tonnes of space dust that the earth's gravity pulls in like a giant vacuum.

据估计，地球引力像一个巨大的真空吸尘器一样吸进了4万吨太空尘埃。

So, it's truly fundamental, because earth gravity is quite deep. Earth has a fairly high gravity.

所以，它真的很重要，因为地球引力非常深。地球具有相当高的引力。

And that was funny, really, because he was very preoccupied with the earth's gravity and falling bodies.

这很有趣，真的，因为他全神贯注于地球引力和坠落的物体。

And until they open the first hardware store outside of earth's gravity well, our best bet is asteroids.

在他们开设地球重力井之外的第一家五金店之前，我们最好的选择是小行星。

As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earth's gravity.

随着火箭徐徐升空，我们被重重地向后推在座位上，因为我们正慢慢逃离地球的引力。

Rockets need all the speed they can get in order to break out of earth's gravity and the earth's natural rotation speed can give them a much-needed boost.

火箭需要尽可能快的速度来摆脱地球的引力，而地球的自然自转速度可以给它们提供急需的推动力。