the.com/orbital resonance
when gravity turns a cosmic timing coincidence into a permanent, self-reinforcing habit.
means orbital resonance is when two orbiting bodies exert regular gravitational tugs on each other because their orbital periods form a simple ratio, like 2:1 or 3:2.
from the concept crystallized in the 1700s-1800s as astronomers noticed jupiter's moons io, europa, and ganymede kept lining up in the same repeating pattern, and laplace worked out the math showing gravity locks such ratios in place rather than letting them drift.
neptune-pluto lock3:2 resonance keeps them from ever colliding.
kirkwood gapsresonance with jupiter empties asteroid belt lanes.
saturn ringsgaps carved by resonances with shepherd moons.
laplace resonanceio, europa, ganymede lock in 4:2:1 ratio.