Planetary accretion is the process that gradually accumulates small particles into large different parts of the nebular disk, because of the different condensation temperatures of particles at various distances from the hot protosun.

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Planetary accretion is the process by which small particles come together to form larger bodies within a protoplanetary disk, and this process is driven by the differential condensation of materials at different distances from the central protostar. As the disk cools, solid particles begin to stick together through various mechanisms, such as coagulation, accretion, and gravitational instability, eventually forming larger and larger bodies that can eventually grow into planets.

Planetary Accretion Is the Process That Gradually Accumulates Small Particles