The planet's rotation rate has something to do with it.

这和行星自转的速度有关。

Decrease the size, and the rotation rate goes up.

如果减少尺寸，转速就增加。

The Earth would have been spinning too fast to account for its present rotation rate.

地球旋转得太快，以至于无法计算出现在的旋转速度。

There simply isn't enough mass far out from the center to account for the rapid rotation rates.

只是离中心远的地方没有足够的质量来解释快速的旋转速率。

For one thing, it has an incredibly slow rotation rate: one day on Venus is about 243 Earth days!

首先，它的自转速度非常慢：在金星上的一天大约是243个地球日！

Still, it exists and it's out there affecting every galaxy's mass and rotation rate.

尽管如此，它仍然存在并且影响着每个星系的质量和旋转速度。

It was actually the first star, besides the Sun, where we had a measurement of the internal rotation rate.

Aerts：它实际上是除太阳之外的第一颗恒星，我们在那里测量了内部旋转速率。

This increases the pulsar's spin, and we know of a few that have incredibly rapid rotation rates; some spin hundreds of times per second!

这会增加脉冲星的自旋速率，我们知道有一些脉冲星自转速度非常快，有的每秒就可以旋转数百次！

According to a 2001 paper published in Nature, the axis-flip mechanism is most likely if Venus had a rapid initial rotation rate.

根据 2001 年发表在《自然》杂志上的一篇论文，如果金星的初始自转速度很快， 则轴翻转机制是最有可能的。

To figure out which idea is most likely, we have to know more about Venus's early dynamics, specifically its rotation rate and axial tilt.

为了找出最有可能的想法，我们必须更多地了解金星的早期动力学，特别是它的自转速率和轴向倾斜。