As these clumps grew, their gravity increased, and eventually started drawing more material in.

随着这些团块不断增大，它们的引力也越来越大，随后开始吸引更多的物质进来。

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。

Gravity increases proportionally to the mass of the objects involved.

重力与所涉及物体的质量成比例地增加。