"Kissing", "contact", and photos of objects like Arrokoth are too misleading. The Earth/Moon and Pluto/Charon situations started with extremely high speed coll

"Kissing", "contact", and photos of objects like Arrokoth are too misleading. The Earth/Moon and Pluto/Charon situations started with extremely high speed collisions (plenty of kinetic energy) between separate bodies. Those collisions were spectacular sideswipes (vs. head-on), so there was also a huge amount of rotational inertia. That's another must-have, to end up with two bodies orbiting each other.