What two primary factors create the perpetual, dynamic balance observed in planetary orbits?

Answer

The inward tug of gravity and the outward tendency of inertia (sideways motion)

Stable orbits are the result of a perpetual balance between gravity pulling everything inward toward the Sun and the sideways motion or velocity (inertia) of the planets.

What two primary factors create the perpetual, dynamic balance observed in planetary orbits?

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