Problem: In the standard model of the formation of the Solar System (the Solar Nebula Theory), why are the planets in a plane (more-or-less). Need Assignment Help?
The force from the forming Sun is stronger in the plane than out of the plane, conforming the solar system to that shape.
Of these responses is true.
The planets move slower closer to the forming Sun, so this stretches out the shape into a plane.
Since it is so much hotter closer to the Sun, the forming solar system heats up close to the proto-star forcing out the matter that is not in plane about the Sun.
The conservation of angular momentum causes it to fall into a plane shape.