Stability of the Solar System that keeps the far side of the Moon away from the Earth. Mercury is in a 3:2 spin–orbit resonance. The planets' orbits are chaotic over longer timescales, such that the whole Solar System possesses a Lyapunov time in the range of 2–230 million years. In all cases this means that the position of a planet along its orbit ultimately becomes impossible to predict with any certainty (so, for example, the timing of winter and summer become uncertain), but in some cases the orbits themselves may change dramatically. Such chaos manifests most strongly as changes in eccentricity, with some planets' orbits
Terra Alta, West Virginia Terra Alta, West Virginia Terra Alta is a town and former coal town in Preston County, West Virginia, United States. The population was 1,477 at the 2010 census. Terra Alta was originally called Portland, and under the latter name had its start in the 1850s. The present name Terra Alta is derived from Latin meaning "high land". The town is home to the James S. Lakin House and Terra Alta Bank, each listed on the National Register of Historic Places. Terra Alta is located at (39.444343, -79.544002). According to the United States Census Bureau, the town has a total area