It's a beautiful sight to see when stars twinkle above our heads at night. But why can we only see them when it's dark outside? Readers will learn the answer to this question and more throughout this intriguing volume, as they uncover facts about the sun's light, Earth's atmosphere, and the matter inside of a star that makes them twinkle. Eye-catching photographs accompany the main text, making an enjoyable reading experience that supports elementary science curriculum. The achievable text supports knowledge building, a key component of the science of reading.