THE FORMATION OF THE SOLAR SYSTEM.

Planetesimals and planets forming in a collapsing (by the force of gravitity), dusty cloud. Dust grains act as condensation nuclei, forming clumps of matter that collide, stick and grow. Large eddies also come and go as the gas in the disk swirls around. According to the condensation theory, the larger eddies and clumps of matter will eventually become planets. The large blob in the center will become the Sun.