From the moon and sun to the farthest galaxies, outer space is full of celestial wonders that captivate and inspire people worldwide. Introduce young stargazers to marvels beyond Earth and the tools scientists use to study them, including rovers and telescopes. Each title in this high-interest astronomy series includes vibrant photos, elementary-level text, and an in-depth look at one key feature. What is that big collection of gas, dust, and stars floating far beyond Earth's atmosphere? It's a galaxy! With the help of vibrant images and factual, elementary-level STEM text, this nonfiction astronomy title for children examines the history of galaxies, their age, location, composition, and formation. It also explores how they were discovered. A space science feature spotlights galaxies as windows to the past. Captions, on-page definitions, additional resources, and an index support readers in grade 2 and up.