研究星团的天文学家已经注意到质量一定的行星(通过追踪表面阴暗冷却斑点来测量)，其旋转速度随着其星龄呈现可预测性的变化。
Astronomers who study star clusters have noticed that the speed at which a star of a given mass spins (measured by tracking cool, dark spots on the surface) also seems to vary predictably with age.
最大的小行星是谷神星，其体积大约是月球的四分之一。
The largest asteroid is Ceres, which is about a quarter the size of the moon.
不过，即使是完全准确的计算，其结果与天王星的实际运行轨迹也并不完全一致。
Notwithstanding, all nicety of calculations, the real course of Uranus would not at all agree with the one computed.
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