The Universe - Is everything that exists. It is very big and too large to measure., Galaxy - A collection of gas, dust, planets, and stars. There are millions of them., The Milky Way - The name of our galaxy. It is spiral shaped., The Solar System - Includes Earth, seven other planets, and a central star., Planets - Bodies that orbit a star. (Earth is one of them)., Natural Satellite - Bodies that orbit a planet. (The Moon is Earth's only one).,

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