Stars are luminous balls of gas, primarily composed of hydrogen and helium, that generate energy through nuclear fusion, emitting light and heat across vast distances in space. Articles are a unique way for readers to learn about the world around them. In addition to building reading comprehension skills and increasing vocabulary, articles can be used for writing and research. Stars is broken into 6 single-page sections: Introduction, What are They Made of?, Types of Stars, Pictures in the Sky, Amazing Facts, and Words to Know.