Sun and its planets. Illustration of the Sun and the eight planets that form part of the solar system, depicted hanging from a mobile. Most of the mass of the solar system is found in the Sun, which is not shown to scale here. The eight planets are (from left to right): Neptune, Saturn, Mars, Venus, Mercury, [the Sun], Earth [and the Moon], Jupiter and Uranus. The smaller four planets are rocky planets of the inner solar system. The larger four planets are gas giant planets of the outer solar system. |