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Declicart · Answer 1 · 2018-10-03T07:57:50+0000

From smallest to largest: Planetesimals to protoplanets to moon to planet.
A planetesiamal is a small body from which planets originate. When planetesimals joins together they become protoplanet. An aggregation of protoplanets will become a moon or a planet. Moons are always smaller compared to the planet they orbit.

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