Planets: A Book Filled With Facts For Children - Kids, Bold
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A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best theory for the formation of planets is known as the nebular hypothesis. This theory states that a protoplanetary disk erupts from the collapse of an interstellar cloud. A young protostar then orbits the disk.

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Produktbeschreibung
A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best theory for the formation of planets is known as the nebular hypothesis. This theory states that a protoplanetary disk erupts from the collapse of an interstellar cloud. A young protostar then orbits the disk.