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Physical sciences  
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Middle school  
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5 to 10 minutes  
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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 video to accompany the Stanford Solar Center's Build Your Own Spectroscope activity. It serves as an introduction to several aspects of the Sun, including information about solar activity, effects of solar activity on Earth and other... (View More)