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In this lesson, students read the original paper written by Henrietta Leavitt in which she compared the apparent brightness and period of Cepheid variable stars. The students prepare graphs from numerical data, just as she did, and compare their data to hers. They then discover that there is a relationship between the period and luminosity of the variable stars she observed, and experience for themselves how scientists really collect data. Materials required include standard graph paper and logarithmic graph paper (a template is supplied). This activity is part of the "Cosmic Times" teacher's guide and is intended to be used in conjunction with the 1929 Cosmic Times Poster.