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Grade 12  
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This classic video explains the history, debate and continuing discussion of the definition of a planet.

Keywords: Dwarf planet
Audience: Middle school, High school, Informal education
Materials Cost: Free

This is a legacy site for videos and animations related to the Deep Impact mission and encounter with Tempel 1. Learners can watch videos about the mission, encounter, science, and results.

Audience: Middle school, High school, Informal education
Materials Cost: Free
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