if a planet so big as planet 9 can move so much stuff then how is it not just like a blackhole because if i took a car and another bigger car and smaller cars and crashed them the most likely most damaged one is the car second to biggest because it would be hit from the big car and small car (same with gravity why isnt planet 9 just ripping apart), because all planets we can see but planet 9 no its just a black gas cloud moving in circles