Learn about the Sun and the objects that orbit it, including the eight planets, the nine dwarf planets, and the small bodies such as asteroids, comets, and moons. Explore the formation, evolution, and exploration of the Solar System, and its location and features in the Milky Way galaxy.

Learn about the eight planets and five dwarf planets in our solar system, their sizes, locations, temperatures, and features. Explore the inner and outer planets, and the hypothetical Planet X, with NASA's science and stories.

Learn about the eight planets in our Solar System, their distances from the Sun, sizes, temperatures, atmospheres, moons, and more. Find out how they are classified as terrestrial, gas, or ice giants and why Pluto is not a planet.

Learn about the Sun and the eight planets that orbit around it, as well as their satellites, asteroids, comets, and other features. Explore the origin, evolution, and composition of the solar system with Britannica's articles, videos, and diagrams.

Learn about the planets, dwarf planets, moons, comets, asteroids, and more in our solar system. Find facts, missions, videos, and skywatching resources from NASA.

Learn about the eight planets in our solar system, their sizes, distances from the sun, and how they were formed. Find out what is a planet, how to spot a possible Planet Nine, and how our solar system compares to others.

Learn about the Sun, the star at the center of our solar system, and the eight planets, their moons, and other objects that orbit it. Find out how long it takes each planet to go around the Sun and how many moons Jupiter has.

Learn about the eight official planets in our solar system, their names, order, features, and categories. Find out the definition of a planet, the debate over Pluto, and the difference between terrestrial and giant planets.

Learn about the Sun, planets, dwarf planets, moons, asteroids, and comets that make up our solar system. Find out how it formed, how big it is, and how it compares to other stars and galaxies.