What is the theoretical source of the solar nebula from which our solar system formed?

Various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation.

The different planets are thought to have framed from the sun based cloud, the plate molded billow of gas and clean left over from the Sun's development. The right now acknowledged strategy by which the planets framed is gradual addition, in which the planets started as tidy grains in circle around the focal protostar.