由于这个环境中具有地心引力，因此向上的速度不会坚持很久；最后这个球会上升到顶点并开始下降。
Given that the world has gravity, that upward velocity won't last long; eventually, the sphere reaches the apex and begins its descent.
清单 1 中的源代码给出了一个简单的例子，这个环境中中存在火星的地心引力，里面有一个球具有向上的速度。
The source example in Listing 1 shows a simple world with Mars' gravity and a sphere that currently has some upward velocity.
这个理论诞生于对其他星系的观测，他们在各个方向上以极高的速度远离我们的星系，好像都被某个古老的爆炸性力量推进着。
This theory was born of the observation that other galaxies are moving away from our own at great speed, in all directions, as if they had all been propelled by an ancient explosive force.
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