The Solar Nebula Theory
How does this theory work?
The Solar Nebula Theory: Explained.
In the Model, a small molecular cloud was caught in a gravitational collapse, the collapsing mass collected into the center, which created the sun, when the rest of the mass tried to flatten into a disk, which the rest of the mass created everything else, from meteors to planets and asteroids.
These beautiful nebula's were created by huge stars with left over mass.
The heavier mass sunk to the center, while the lighter mass floated to the top, which creates a layer that is named crust.
these are just nebula's, which contain more than one star.