Jupiter is the largest planet in the solar system, a gas giant primarily composed of hydrogen and helium, known for its Great Red Spot and numerous moons. 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. Each Planet is broken into 6 single-page sections: Introduction, What is it Made of?, By the Numbers, Neighbors, Amazing Facts, and Words to Know.