I have also read that objects in space cause a curvature of spacetime, and that the more massive the object, the greater the curvature.
I can understand the use of the rubber sheet analogy up to this point.
But now I read that objects follow the curvature of spacetime (the rubber sheet), and that this is what the force of gravity is.
My problem is, that if an object is going to "follow" the curvature of spacetime, then it has to be moving. This works fine in the analogy because there is always an external force pulling the balls into the sheet(the balls move due to the force, and therefore follow the curve.) It does not work in Reality, as there is no "down" in space.
If the object is not moving, then surely gravity (the curvature)will have no effect.
Basicy, due to the fact that one object does begin to move towards another due to gravity, according to the analogy, there must be another force(or the analogy is wrong in this respect). What is it? Don't say gravity, because thats what we're trying to explain - and how can gravity cause gravity?

The problem I have is that the analogy actualy uses an example involving gravity- to explain gravity. Sure, on a rubber sheet on earth the balls will cause depressions, But that is in one direction (down) and is caused by an external force outside of the sheet and balls(the gravity of the earth). In space there is no up and down and certainly no force pulling planets into the invisible "rubber sheet" of spacetime in order to cause the depressions(curvature).
Maybe I am trying to get more out of a simple analogy than it was intended to explain.
Please let me know what you think
