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The nature of science  
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Assessment item  
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Astrophysics  
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This story-based lesson presents information on the early investigation into solar and cosmic X-rays, as well as the scientists working in pursuit of X-ray detection and imaging, that set the stage for a program of space-based astronomy. The lesson... (View More)

Audience: High school
Materials Cost: Free

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... (View More)

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