Because voters have to predict in advance who the top two candidates will be, this can cause significant perturbation to the system:

For smaller bodies particularly, light and stellar wind can cause significant perturbations to the attitude and direction of motion of the body, and over time can be significant.

For short duration missions without significant perturbations from sources outside the Earth-Moon system, a fast Hohmann transfer is typically more practical.

Because ecosystems are resistant to state shifts, significant perturbations are usually required to overcome ecological thresholds and cause shifts from one stable state to another.

Ecosystems can shift from one state to another via a significant perturbation directly to state variables.

The restrictions on departure windows arise because low earth orbits are susceptible to significant perturbations; even over short periods they are subject to nodal regression and, less importantly, precession of perigee.

It may have remained dynamically cold and thus its orbit may not be a direct result of significant perturbations during Neptune's outward planetary migration.

From these basic parameters, just four basic differential angular arguments are enough to express, in their different combinations, nearly all of the most significant perturbations of the lunar motions.

In centimeter and meter-sized bodies, viscosity may cause significant perturbations that can change an orbit.

Lincoln and Jefferson must be causing significant perturbation in their interment sites.