What is that rocky object flying far beyond Earth's atmosphere, past stars, moons, and planets? It's a celestial body called an asteroid! With the help of vibrant images and factual, elementary-level STEM text, this nonfiction astronomy title for children examines asteroid age, composition, formation, and location. It also explores key discoveries in history. A space science feature spotlights a NASA spacecraft's visit to an asteroid. Captions, on-page definitions, additional resources, and an index support readers in grade 2 and up.