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This is an activity about telescopes. Learners will first measure several circles to determine their diameters and calculate their areas. Afterwards, they will cover each circle entirely with pennies and record how many pennies are needed for each circle size. The concept to be explored is that as the diameter of a telescope lens or mirror increases, the telescope is thus able to collect more light. This is Activity J-1 of Universe at Your Fingertips 2.0: A Collection of Activities and Resources for Teaching Astronomy DVD-ROM, which is available for purchase.