Here's a breakdown:

* Nebula: A giant cloud of gas and dust in space.

* Gravitational Collapse: Due to the force of gravity, the particles in the nebula begin to pull towards each other.

* Spinning Cloud: As the nebula collapses, it starts to spin faster and faster, conserving angular momentum. This spinning motion eventually forms a flat, rotating disk.

This process is a crucial step in the formation of stars and planetary systems.