Why Is the Solar System Flat?

As soon as our solar system was made from a spinning cloud of dust and gas, it came about to form in such a way that all planets assemble on a single plane.

As soon as our solar system was made from a spinning cloud of dust and gas, it came about to form in such a way that all planets assemble on a single plane. But through all of 3D space to select from, why did it turn out plane or flat?

Observing that plenty of other arrangements in the Universe are flat, too, this Minute Physics video attempts to describe why. The answer is grounded on the way particles in huge dust and gas clouds travel and strike, as well as a coincidence of the fact that we occupy a 3D Universe. But at that fact, watch the video, since it clarifies it way, way better than I ever can. [MinutePhysics]