Kenneth Chang

Same concept as ocean tides on Earth. One high tide under Moon, also high tide the side of Earth opposite from Moon.

On earth, bulges on both sides have the same density. Not so on Pluto. Imagine a lead weight glued to a ping pong ball.

1. Imagine weight starts at far side of Pluto. Then try to rotate it to move it to position under Charon.

2. As soon as it moves, it's offset, and there's a gravitational force trying to pull back to where it started.

We could do the math if you want.

I'm sure, but although the ping-pong ball is stable both ways, chances are if you drop it, it will end up weight down.

You're thinking weight glued to something hollow. Here it's small mass glued to huge and heavy Pluto. Not analogous.

Again, the only way to really figure it out is math.