Activity 3: What's New Our very own planet is one of the members of the solar system. We must understand our neighboring planets in the solar system. The solar system is composed of the Sun and the eight planets, such as Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These planets are classified as inner planets and outer planets. Each of the planets hos different characteristics. They differ in their distance from the Sun, size, temperature, and composition. Some planets are rocky and small and do not have rings. Other planets are gaseous and have rings. They even differ in color, as seen on Eorth. IV. Reflection I have learned that​