This high school physical science lesson has the following learning goals for students: construct a telescope; explain how a refracting telescope works; collect and graph data; and recognize advances in technology by comparing their telescopes to ones used by Galileo and modern high-tech telescopes. A materials list, teacher background information, assessments, outcomes, and extensions are provided. This book selection includes the Table of Contents, Preface, Acknowledgments, About the Authors, and Index.