The first artificial satellite launched on October 5, 1957, forever changing humanity's relationship with the mysterious galaxy we call home. Since then, we have ventured farther into the Milky Way, making incredible scientific discoveries. This fascinating, interdisciplinary volume takes readers through the history of space exploration and into the final frontier of human travel. They'll learn key scientific concepts about the universe, such as the different types of galaxies and how we measure space travel. Vivid photographs and graphic organizers provide captivating visuals. Fun fact boxes and informative sidebars provide smaller, understandable chunks of amazing data.