Orbital resonance occurs when orbiting bodies (like planets, moons, or asteroids) exert regular, periodic gravitational influences on each other, usually because their orbital periods are related by a ratio of small integers. These synchronized interactions mean the bodies line up in the same relative positions periodically, resulting in enhanced, long-term stability or, less commonly, chaotic, unstable orbits.
DID I NICK THIS FROM GOOGLE.... I MOST CERTAINLY DID but the gravitational pull of the planets does interest me