Final answer:
The Solar System's direction of revolution was set by the rotation of the cloud of gas and dust it formed from, aligning all planetary motions with the original spin and conserving angular momentum.
Step-by-step explanation:
The direction of revolution in the plane of the Solar System was determined by the original rotation of the cloud of gas and dust from which it developed. As the Solar System coalesced, the orbital motions and spins of the planets aligned with this initial spin, conserving the angular momentum of the parent cloud. This pattern demonstrates that gravitational forces and the conservation of angular momentum played a pivotal role in shaping the movements and orientations within our Solar System.