Is gravitational force causing distant planet like neptune revolving arond sun is the greatest force ?

Answer 1

Since your sentence doesn't make grammatical sense, I'm not sure what you're asking. I'll try to answer it anyway.

On a very small scale, the gravitational force is much weaker than the other three fundamental forces (electromagnetic force, strong nuclear force, weak nuclear force). So weak, in fact, that it's totally insignificant for, say, an electron orbiting the nucleus of an atom.

However, on the large (planetary) scale, there isn't enough charge imbalance to lead to large forces, and the strong and weak nuclear forces are too short-range to have any effect. So, on the large scale, gravity is the dominant force.

I hope that's what you were asking.

Answer 2

If I understand what you are asking, yes gravity is what causes Neptune and all others to orbit the sun. Actually it is a balance of gravity from the sun pulling the planet in, and this is balanced by the speed of the planet as it revolves around the sun (balance of a centrifugal type of force like swinging a weight on a rope fast around your head), with respect to the mass of the planet. The actual revolution of the planet was given to it when it was created in the spin of the freshly recycled sun as it threw out the material that would eventually coalesce and form the planets and moons and asteroids. That is also why all the planets and other things in our solar system are in a planetary plane and spin in the one direction that they all do. Anything different would lead one to believe that some other force would have been responsible.