Climb Aboard! Explore different types of galaxies! Learn how galaxies are formed! Meet key astronomers examine the tools they use such as the Hubble Space Telescope, satellites, and probes! See an infographic showing Earth in the Milky Way! Did You Know? facts and a Guidebook of seven different galaxies 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.