Formation of moons around a gas giant, illustration. This is how the moons of Jupiter and Saturn, and possibly Uranus, are thought to have formed. The planet is in the center, still growing. A concentric disc surrounds it, inside of which the natural satellites are forming via the process of accretion. The illustration could also show the formation of planets around a star, which was a similar process albeit on a far larger scale. [ + ] [ - ]

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