Originally Posted By: redewenur
Alternatively, Bill, there's General Relativity explanation, according to which no acceleration is being applied to the Moon. Instead, the Moon follows a geodesic through the curvature of spacetime caused by the mass of Earth.


This does not answer the question. The question is "how does the presence of the Earth hold the geodesic in shape without expending energy?"

I shall have to give Kallog's maths a bit of thought before trying to respond to his post.

There never was nothing.