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This is a unit in 11 sessions about the solar system. Learners will explore the terms planet and moon, they will sort and classify various solar system bodies into categories, and use this context to discuss if Pluto is a planet. They will also research a particular solary system object and create a travel brochure for that object which they will use to help their classmates take a tour of the solar system. They will then construct an outdoor scale model of the inner and outer solar system. Finally they will create a human-powered orrery. This is Unit 3 of the GEMS Space Science Sequence for Grades 6-8, which is available for purchase (see related link).