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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 a telescope with a larger lens or mirror is able to collect more light than another telescope with a smaller-diameter lens or mirror. This is Actividad 10.2 as part of El Universo a Sus Pies, a Spanish-language curriculum, available for purchase.