Tabla de Contenidos: “…Chapter 20: Draco, The DragonClusters, Nebulae, and Galaxies; Multiple Stars; Chapter 21: Eridanus, The River; Clusters, Nebulae, and Galaxies; Multiple Stars; Chapter 22: Gemini, The Twins; Clusters, Nebulae, and Galaxies; Multiple Stars; Chapter 23: Hercules, The Hero; Clusters, Nebulae, and Galaxies; Multiple Stars; Chapter 24: Hydra, The Water Snake; Clusters, Nebulae, and Galaxies; Multiple Stars; Chapter 25: Lacerta, The Lizard; Clusters, Nebulae, and Galaxies; Multiple Stars; Chapter 26: Leo, The Lion; Clusters, Nebulae, and Galaxies; Multiple Stars…”