Inertia changes the effects of gravity on objects in the solar system keeps the sun stationary pulls asteroid prevents planets from pulling into one another.
Planets tend to resist changes in their direction and rate of motion, like any objects with mass. The solar system's planets, including Earth, are kept in stable orbits by the combination of inertia—a tendency to resist change—and the sun's gravitational pull.
The orbits are formed and maintained by the gravitational pull of the sun, planets, and inertia. The sun and the planets are kept apart by gravity, which pulls them together. The tendency to maintain speed and continue moving is provided by inertia.
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