Well, my biggest q, isn't exactly about the 2-body, it's more like 3-body I guess. What I'm trying to accomplish here is to say that we can not ignore a small third mass orbiting around a sun-like object. I have the Sun-Like Object and another object (L) orbiting around it, now L is following an ellipse shape because the center Sun object is having a gravitation pull on m1. Now a smaller object (K) further away is also being affected by the gravitational pull by the Sun object but even L has a gravitational pull on K, so that K object is (having 2 gravitational pulls effecting it)? And this cuases turbulation which is why the ellipse is squiggly? Does this make any sense or am I to ambiguous? Another question is: Consider kepler's first law. The planets orbit is an eiplse since it's binding energy is near 0 but not equal to 0. As planets orbit around a sun we can see that the distance from the sun on the planet's position is not constant. Can it be constan is my question? When, how?