What mechanism is proposed for the gradual growth of proto-moons after the initial seed bodies assembled?

Answer

Pebble accretion

Pebble accretion is a process where a proto-moon orbiting within the gaseous disk gravitationally captures the surrounding small particles, or pebbles, moving within its orbital path.

What mechanism is proposed for the gradual growth of proto-moons after the initial seed bodies assembled?
astronomyJupitersolar systemformationGalilean moonsmoonsmoon formation