The wonders of space exploration is presented in these easy-to-read books about the spacecraft designed to do the work. From the International Space Station in low Earth orbit, to the wonders of Mars, to the farthest planets of our solar system, this series explores how scientists and engineers have built and launched machines to help them discover the secrets of our galaxy and beyond! Aligned to Common Core Standards and correlated to state standards. A&D Xtreme is an imprint of Abdo Publishing, a division of ABDO.