公布 中文名称：自转曲线 英文名称：rotation curve 定义：描述星系各部分的自转速度与到自转轴距离的关系曲线。其形状由星系中的质量分布所决定。 应用学科： 天文学（一级学科）； 星系和宇宙（二级学科） 自
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从这条曲线，记住这条曲线，So, from, that, curve—，因为接下来它会，很重要，从中你们推导出3样：，半径，自转周期，已经我旋转的，物体的速度。
And keep that with you, because it's going to be important in what follows we can derive three things: the radius, the period of rotation and the speed of the object as I twirl it around.
同样，地球减慢其自转并停下来所需要的时间是几周，而不是几个月，这种情况是曲线似的，因而最后几天（地球）才“刹车”停止转动。
The amount of time that the Earth requires to slow her rotation to a stop is likewise weeks, not months, and this is on a curve so that the last few days are where the brakes are really applied.
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