Everywhere we look in our solar system we see orbits. Planets orbit the Sun and moons orbit planets. The speed of these orbits follow the inverse square law, and they are remarkable stable. This tells us that there is something simple and stable behind them. The obvious candidates are either mass or static electricity, both of which change very little over time.
Other candidates, such as magnetic fields or currents are too unstable. It is hard to imagine such variable forces being the origin of stable orbits.
A simple model that would create stable orbits works as follows: The electrostatic force acts from the surface of objects to push them apart, while gravity acts from the centre of objects to pull them together. Gravity prevents such objects from easily escaping each other, and the electrostatic force prevents them from crashing into each other. Stability is thus achieved.
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