The ____ System is a system of ____ and their satellites that ____ around the Sun. The Sun is a ____ and it is the ____ of the Solar System. There are ____ planets. ____ is the biggest planet in the ____ and Mercury is the ____. Some of the ____ have natural ____ that revolve around them. The ____ natural satellite is the ____. The Moon takes twenty ____ days to rotate ____ the Earth.

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