Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

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When plants shoot on the earth, their stems grow away from the gravity (the force that keeps your feet on the ground), and so they always shoot upwards.

当植物在地面上生长时，它们的茎生长得方向与重力相反（重力是让你的脚留在地面上的力量），因此它们总是向上生长。

youdao

Unfortunately, there is no place, yet, for the fourth universal force, gravity.

遗憾的是，目前在表格中还没有第四种力，引力的位子。

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Newton proved his idea by measuring how much gravity force would be needed to keep the moon orbiting the Earth.

VOA: special.2011.06.01

Now, gravity, well force, is equal to mass times acceleration, g and the acceleration due to gravity is g.

是重力，等于质量乘以加速度，由重力导致的加速度是。

麻省理工公开课 - 热力学与动力学课程节选

That is, you minimize potential energy and you see things falling under the force of gravity and so forthgoing to potential energy minima in conformance with this result.

换句话说，你使得势能最小化,然后发现我们关注的东西,在重力或者其他力的作用下下落,直到势能最小的地方,这和我们刚才的结果是一致的。

麻省理工公开课 - 热力学与动力学课程节选

According to Einstein, the force of gravity keeping your feet on the ground is fundamentally identical to the force slamming your body forward when you hit the brakes on the highway or take a sudden sharp turn.

FORBES: Physicists Seek A Divorce: Prying Gravity ... From Inertia

On a lark, Mr. Minsky spent some time "inventing useless things, " he says, such as a "gravity machine, " a device that would ring a bell if the force of gravity changed.

WSJ: Looking for Something Useful to Do With Your Time? Don't Try This

Because it opposes the attractive force of gravity, dark energy tends to inhibit cluster formation.

ECONOMIST: Cosmology