But around a black hole the orbital speeds are near the speed of light.

但黑洞周围的轨道公转速度接近光速。

At aphelion, Mercury's spin is a bit faster than its orbital speed, so the Sun moves rapidly westward across the sky.

于是在远日点时，水星的自转速度会比它的公转速度稍快一点，所以太阳会在天空中快速地向西移动。

As they hit our atmosphere, they slow from their ridiculous orbital speed to nearly a standstill, and all that energy has to go somewhere.

当它们撞击我们的大气层时，它们的轨道运行速度会从一个异常惊人的速度下降到几乎停止，而所有的能量都必须流向某个地方。