Figure 8. Scheme for the formation of a gas-dust accretion disk and a subdisk. The proto-Sun onto which matter from the protoplanetary nebula (the red color) continues to accrete is at the center. The green color indicates the forming dust subdisk, near which the outflow of gas and dust, including the formed high-temperature condensates in the inner zone, such as refractory CAIs, takes place. The blue color indicates the bipolar flows of matter attributable to the solar magnetic field.

Source: International Space University.