This video segment adapted from Shedding Light on Science describes how astronomical distances can be measured in units of light-years, and how the finite speed of light allows astronomers to study how the universe looked long ago. Includes background reading and discussion questions. [3:48]

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speed of light, universe, 5-ess1-1, light-years, pbs learningmedia: light years, how fast light travels, star, light year

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Classroom Considerations

Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
The intended use for this resource is Instructional|practice

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