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Examine the accompanying graph (Figure 15-1). Harlow Shapley did not know that there are two categories of Cepheid variables; he was only familiar with those such asdCepheii. Because of this, some of the Cepheid variables he observed ____.a.were RR Lyrae variablesb.had a longer pulsation period than he expectedc.were dimmer than he expectedd.had a shorter pulsation period than he expectede.were brighter than he expected
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