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This is a reading strategy guide in a series of guides that utilizes articles from the Great Explorations in Math and Science (GEMS) program. These strategy guides provide teachers of middle school students with a reading strategy (in this case, Teaching Scientific Comparison Writing) and supplemental resources, background information on that strategy, connections to standards, classroom implementation techniques, tips for utilizing this strategy with students with dyslexia, and a two-page reading based on a particular space science concept. The reading incorporated into this strategy guide, "Pluto and Charon," compares the dwarf planet P PLUTO AND CHARONluto with its relatively large moon Charon. Like other moons in our Solar System, Charon orbits Pluto. Unlike other moons, however, the size and mass of Charon make it orbit Pluto in an unusual way. Because Charon is so large compared to Pluto, the two Solar System objects are described as orbiting a spot between them, rather than around a spot in the center of the planet. In contrast, most planets are more massive than their moons, so the orbital center is the center of the planet. This strategy guide is also mapped to the Common Core State Standards for English Language Arts Literacy in Science & Technical Subjects, Grades 6-8.