Hi,

we have a system of two balls, one (the smaller) orbiting the other, with the following characteristics:

-The system is totally isolated (no external forces whatsoever..)

-The system is in space (no air resistance..)

-The balls are perfect spheres, homogeneous, and the orbit is a perfect circle.

Then theoretically:

1-will the balls orbit each other forever?

2-will they orbit forever according to both classical physics and general relativity?

3-such a system will have a constant total energy, its entropy will be constant too. but shouldn't entropy increase over time? or is it allowed to stay constant? what does the second law of thermodynamics say abt it?

Thx.