What physical interaction caused the newly formed moons to migrate steadily inward toward Jupiter?

Answer

Aerodynamic drag from the disk gas

The interaction between the growing satellite and the remaining gas in the disk created density waves which exerted a braking force, causing the moon to migrate progressively inward toward Jupiter.

What physical interaction caused the newly formed moons to migrate steadily inward toward Jupiter?
astronomyJupitersolar systemformationGalilean moonsmoonsmoon formation