The solar system originally accreted (essentially "condensed" by gravity) from a spinning disc of dust and rock called an accretion disc. As a consequence the majority of the planets and moons revolve around the Sun roughly on a single plane, called the plane of the ecliptic, and in a single direction, referred to as prograde. Seen from above Earth's north pole, prograde motion is anticlockwise. Bodies which orbit in the opposite direction are said to have retrograde motion.