Climb Aboard! Explore how NASA was formed! Meet early astronauts! Examine the Gemini and Apollo programs! Investigate Keck, Keck II, the Hubble Telescope, and the Chandra X-ray Observatory! Learn about space shuttles and stations! See an infographic showing the electromagnetic spectrum! Did You Know? facts and a Guidebook of landmarks in space exploration complete your journey. Aligned to Common Core standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.