Because on the moon, the moon has no atmosphere and has one-sixth Earth gravity.

因为月没有大气层，力只有地之一。

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

使其能以足够快速度逃离地力，从此开始航天飞机时代。

Plants have evolved over millennia using the strong gravity on Earth.

利用地上强大力，植物已经进化了数千年。

So, they escape Earth's gravity and drift off into space.

因此，它们逃离地力，漂向太空。

Leaving the moon's gravity was not as painful as leaving the earth's.

摆脱月力不想摆脱地力那样痛苦。

For instance, Martian sand dunes form and behave similarly to our sand dunes, though the Martian versions often grow twice as large thanks to a gravitational pull that's about a third as strong as ours.

例如，火沙丘形成和运动跟地上沙丘情况是相似，可是火沙丘体积 通常是地上两倍，因为火力只是地上三之一。

Rockets must travel at least 25,000 miles an hour to escape Earth's gravity.

为了逃离地力，火箭必须以每小时至少2.5万英里速度飞行。

The gravity of earth is what makes flames rise and look like they do.

地力使火焰升起，呈现出我们看到样子。

That is a place where the gravity of the sun, moon and Earth are balanced.

那是一个太阳、月和地力平衡地方。

Through studies conducted with the Large Hadron Collider, there is an idea that the force of gravity on our world is quite weak because the gravitons that conduct its power are spread out throughout universes parallel to our own.

通过使用大型强子对撞机进行一系列实验，有人认为地力确实很微弱，因为它力相距甚远从平行宇宙到我们每个人自身。

4,000 Newtons is about equivalent to 900 pounds here on Earth's gravity so you can think of a sea lion or a really big moose, that is the amount of force that it takes.

4000 牛顿大约相当于地力下 900 磅，所以你可以想象一只海狮或一只非常大驼鹿，这就是它所需要力量。

But instead of lassoing the rock like a bull in a Rodeo, the tractor will hover in front of it, and use gravity as a tow line.

不是像竞技表演里套牛那样套住陨石，而是盘旋在小行前面，用地力作为拖绳。

Something else conjectured by Newton in the Principia was that a plumb bob hung near a mountain would incline very slightly toward the mountain, affected by the mountain's gravitational mass as well as by the Earth's.

牛顿在《原理》中作另一个推测是：一根挂在大山附近铅锤线，会受到大山和地力质量影响，稍稍向着大山倾斜。

Over time and with slightly more careful observation, it became clear that birds were indeed seasonally hitching rides on the wind — but not to nose-dive into lake mud or escape Earth's gravity for far-off celestial bodies.

随着时间推移和稍加仔细观察，人们逐渐发现，鸟类确实季节性地搭乘风便车——但不是为了一头扎进湖泥，也不是为了摆脱地力飞向遥远天体。

This week, the spacecraft will use Earth's gravity to slingshot towards a Venus flyby in 2025, and putting it on track to scope out Jupiter and its moons by July of 2031.

本周，该航天器将利用地力，在 2025 年飞越金，并在 2031 年 7 月飞越木及其卫。

Over time, the debris of Gaia and Theia joined together in a dance with Earth's gravity, and formed the Moon we know and love today.

随着时间推移，盖亚和提亚碎片受地力作用结合到一起，形成了我们现在熟悉和喜爱月亮。

This happens because there is a balance between the energy the satellite picked up from the rocket called momentum and the pull of Earth's gravity.

这是因为卫从火箭获得能量（称为动量）与地力之间保持了平衡。

This is because although it's a massively powerful rocket, it will still take the majority of its fuel just to break free from Earth's gravity.

这是因为尽管它是一枚威力巨大火箭，但它仍然需要大部燃料才能摆脱地力。

The pressure of the atmosphere the hundreds of miles of air above me… pulled down by Earth's gravity is 500 times stronger.

大气压我上方几百英里空气被地力拉下压力是它 500 倍。

Once waves have been generated, gravity is the force that drives them in a continual attempt to restore the ocean surface to a flat plain.

一旦波浪形成，地力是持续不断企图使海面复原为平面力量。