Space dust adds tens of thousands of tons of material to Earth each year, yet the planet’s path around its star and the length of a day barely shift. Classical orbital mechanics treats this influx as a minuscule change in the mass term of Newtonian gravity, far too small to rewrite the trajectory already set by Earth’s existing momentum.
In the standard gravitational parameter, the extra dust is a rounding error. Earth’s orbital energy and angular momentum were established when the planet formed; the new material arrives with random directions and low speeds, so the net vector contribution nearly cancels. Keplerian orbits respond strongly to large, directed impulses, not to tiny, isotropic drizzle.
The planet’s rotation is similarly buffered. Conservation of angular momentum means that adding mass near the surface only alters the moment of inertia by a trace amount, and most dust settles gradually rather than forming a fast equatorial ring. General relativity agrees: the modification of the local spacetime metric is so slight that no visible warping emerges in everyday environments.
