In fact, Pluto orbits in a 3:2 orbital resonance with Neptune meaning that for every three complete orbits that Neptune makes around the Sun, Pluto completes two.

• 事实上,冥王星与海王星公转周期有3:2的共振关系,即海王星每环绕太阳三周,冥王星便会环绕太阳两周。