How does light travel?
https://www.nasa.gov/pdf/145908main_Sun.As.A.Star.Guide.pdf#page=15

Gretchen Walker, Patricia McGlashan, Laura Danly, Eric Hamilton, Stephanie Fotiadi, The Education Department at the American Museum of Natural History

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This activity includes two experiments that explore shadows and light and how mirrors can demonstrate how light travels.

Subject: Geoscience:Atmospheric Science:Climatology :Solar radiation, Geoscience:Atmospheric Science:Climatology , Environmental Science:Global Change and Climate
Resource Type: Activities:Lab Activity
Grade Level: Primary (K-2), Intermediate (3-5), Middle (6-8)
Theme: Teach the Earth:Incorporating Societal Issues:Climate Change, Teach the Earth:Course Topics:Atmospheric Science, Environmental Science, Teach the Earth:Enhancing your Teaching:NGSS