The Space Crusaders series highlights some of the key individuals whose contributions have expanded our understanding of space and Earth's place in the universe. This diverse group includes astronauts, engineers, and astronomers. Each title focuses on the life of the featured individual, including his or her childhood, education, career, and the impact the individual made on his or her scientific field. Aligned to Common Core Standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.