The bulk of the mass is spread out, forcing stars to trace a Spirograph-like rosette: an ellipse that does not close on itself but gets offset each time the star completes one revolution[ see box at right].

• 整体质量分散开来，迫使恒星运行方式如旋转绘图盘所画出的花瓣状螺线：那不是每圈都会封闭起来的椭圆，恒星绕行一周后，轨道并不接合便又重新开始下一周的运动（右方〈理轨道秩序〉。