The moon has been a source of fascination to cultures throughout history. Thousands of years ago, people made up myths to explain what the moon was and why it changed over the course of a month. Thanks to scientific advancements over the centuries, we now know the true reasons behind these early mysteries. We also know much more about how the moon's orbit affects our planet in ways big and small. Full-color photographs, intriguing fact boxes, and detailed graphic organizers give young readers a thorough grounding in the science behind our planet's only satellite.