Wow! Great writeup. I see some people saying that as an object gets farther away from the gravity well, accumulating more potential energy, the mass of the obj

Wow! Great writeup. I see some people saying that as an object gets farther away from the gravity well, accumulating more potential energy, the mass of the object increases. Is this true? It seems like it would be very surprising if an object became harder to accelerate just because it changed location.