If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。
It is the gravitational interaction with planets, right?
这是引力与行星的相互作用，对吧？
Today such gravitational compensation probably would not occur: the outer layer of the Moon is too cold and stiff.
今天这种引力补偿很有可能不会发生：月球的外层过于寒冷和坚硬。
Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.
第三，巨大的外行星的引力屏障虽然非常有效，但偶尔也会无法保护地球。
As Europa orbits its planet, however, it flexes due to the gravitational tug-of-war between it, its sister moons, and Jupiter.
然而，当木卫二绕其行星运行时，由于姊妹卫星和木星之间的引力拉锯战，它会弯曲。
According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.
根据一种假设，这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。
Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.
在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。
Astronomers must infer the existence of black holes, which are invisible, from their gravitational influence on the visible bodies surrounding them.
天文学家必须从黑洞对周围可见天体的引力影响推断出不可见的黑洞的存在。
Once Earth had gone through the final stages of its formation, gases bubbled to the surface and were held by Earth's gravitational field to form the atmosphere.
一旦地球经历了其形成的最后阶段，气体就会鼓泡到地表，并被地球的重力场控制，形成大气。
Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it.
天文学家的理论是，当一个巨大的物体在其自身的引力作用下灾难性地收缩，只留下一个强大的引力场，且没有任何东西能逃脱时，黑洞就形成了。
There is a gravitational force.
有一个重力作用。
This is the gravitational potential energy.
这是重力势能。
Notice the gravitational potential energy goes down.
注意，重力势能，是减小的。
And that is 2,000 times the gravitational acceleration.
这也就是重力加速度的2000倍。
Notice that the gravitational potential energy increases.
注意，这里，重力势能是增加的。
In art I want to be free from the earth's gravitational pull.
在摄影作品中，我想脱离地心引力。
A gravitational lens is formed when light is bent by a massive object.
引力透镜现象就是光被巨大质量物体弯曲的现象。
That was well known, and is caused by the gravitational pull of Venus.
那个发现曾引起巨大轰动，并且被普遍认为是由金星的引力引起的。
And now we're going to multiply that by the gravitational force constant.
我们现在把这个结果，和重力常量相乘。
A black hole exerts a strong gravitational pull and yet it has no matter.
黑洞产生很强的引力，而它却没有物质。
But gravitational lensing had never before been used in such a precise way.
但是引力透镜还从未以如此精确的方法被使用过。
Free fall is when the forces acting upon you are exclusively gravitational.
自由落体是指，唯一作用力是重力的情况。
N: Is that because the earth is more massive and so has greater gravitational pull?
尼基：是不是因为地球比较重，地心引力也就比较大？
Another aspect of Einstein's work to be tested is the existence of gravitational waves.
爱因斯坦理论有待证实的另一个观点是引力波的存在。
In their final stages the mergers are expected to be intense sources of gravitational waves.
预计在最后阶段它们会合并成为强引力波源。
In their final stages the mergers are expected to be intense sources of gravitational waves.
预计在最后阶段它们会合并成为强引力波源。
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