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This modular activity traces the history of telescope development and highlights the interplay between technological and scientific advances. Milestones in telescope development are highlighted in the ten sections called "eras," with specific examples included in the associated "telescope pages." The human component is highlighted in the biography pages that provide a glimpse of the inventors and astronomers behind the telescopes. The science of light and telescopes is presented in the section called "Get to the root of it" that can be used for review, learning the basics, or remediation. Detailed teacher pages, identified as Teaching Tips on the title page of the activity, provide science background information, lesson plan ideas, related resources, and alignment with national education standards.