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

因为月球没有大气层，引力只有地球的六分之一。

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。

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

利用地球上的强大引力，植物已经进化了数千年。

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

因此，它们逃离地球引力，漂向太空。

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

摆脱月球引力不想摆脱地球引力那样痛苦。

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，火沙丘的形成和运动跟地球上的沙丘情况是相似的，可是火沙丘的体积 通常是地球上的两倍，因为火引力只是地球上的三分之一。

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

为了逃离地球的引力，火箭必须以每小时至少2.5万英里的速度飞行。

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

地球的引力使火焰，现出我们看到的样子。

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

那是一个太阳、月球和地球引力平衡的地方。

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的一系列实验，有人认为地球的引力确实很微弱，因为它的力相距甚远从平行到我们每个人自身。

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 牛顿大约相当于地球引力下的 900 磅，所以你可以想象一只海狮或一只非常大的驼鹿，这就是它所需要的力量。

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，用地球引力作为拖绳。

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》中作的另一个推测是：一根挂在大山附近的铅锤线，会受到大山和地球引力质量的影响，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.

随着时间的推移和稍加仔细的观察，人们逐渐发现，鸟类确实季节性地搭乘风的便车——但不是为了一头扎进湖泥，也不是为了摆脱地球引力飞向遥远的天体。

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，该航天器将利用地球引力，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，盖亚和提亚的碎片受地球引力作用结合到一，形成了我们现在熟悉和喜爱的月亮。

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的能量（称为动量）与地球引力之间保持了平衡。

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的火箭，但它仍然需要大部分燃料才能摆脱地球引力。

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的空气被地球引力拉下的压力是它的 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，地球引力是持续不断企图使海面复原为平面的力量。