Regularities of the Solar System Regularities of the Solar System Rather than orbiting the Sun randomly, the motions of the planets are rather organized . All objects orbit in the same plane. All orbits are nearly circular. All planets orbit the Sun in the same direction.
Most planets rotate in the same sense as they orbit.
Rocky inner planets vs. icy outer moons. Exposed planetary surfaces are heavily cratered These regular motions are fossil evidence of the processes which formed the Solar System. They imply that the planets formed from a flattened disk of dust and gas.