Stability of the Solar System essentially the distance from sun to earth). These are now known as the Kirkwood gaps. Some asteroids were later discovered to orbit in these gaps, but their orbits are unstable and they will eventually break out of the resonance due to close encounters with a major planet. Another common form of resonance in the Solar System is spin–orbit resonance, where the period of spin (the time it takes the planet or moon to rotate once about its axis) has a simple numerical relationship with its orbital period. An example is our own Moon, which is in a 1:1 spin–orbit resonance
Terra di Lavoro Terra di Lavoro Terra di Lavoro (Liburia in Latin) is the name of a historical region of Southern Italy. It corresponds roughy to the modern southern Lazio and northern Campania and upper north west and west border area of Molise regions of Italy. In Italian the name means literally "Land of Work", but in fact derives from the ancient "Liburia", a territory north of Aversa which took its name from the ancient tribe of the Leborini. The Terra di Lavoro was originally a giustizierato (justiciarship) and then a province of the Kingdom of Sicily, later Kingdom of Naples. After the