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This image sorting assessment activity stimulates a discussion about what students know and don't know about the relative ages of objects in the universe, and about how those ages can be determined. By physically manipulating objects and images of items new and old, students represent their own mental models of change through time. This activity is part of a DVD that is a professional development resource for educators. Many new astronomy learners, students and adults alike, are unfamiliar with the universe beyond the solar system. Instructions for obtaining the DVD and registering for the professional development workshop are contained on the website.