Learn about the Sun, planets, dwarf planets, moons, asteroids, comets, and more in our solar system. Find out how it formed, how big it is, how many moons it has, and if there is life elsewhere.

Learn about the Sun and the objects that orbit it, such as planets, dwarf planets, moons, asteroids, comets, and more. Find out how the Solar System formed 4.6 billion years ago from a collapsing molecular cloud.

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 Sun and the planets, moons, asteroids, comets, and other bodies that orbit around it. Explore the origin, evolution, and composition of the solar system with Britannica's articles, diagrams, and videos.

Learn about the Sun, planets, dwarf planets, moons, asteroids, comets, and more in our solar system. Find out how it formed, how big it is, how life might exist, and what NASA is exploring.

Learn about the sun and the planets, dwarf planets, moons, asteroids, comets, and other objects that orbit our star. Discover how the solar system formed, what it's made of, and how it compares to other star systems.

Learn about the solar system, a collection of planets, moons, asteroids, comets and other objects that orbit the sun. Find out how old it is, how it formed, what planets are in it and why Pluto is not a planet.

Learn about the Sun, planets, moons, comets, asteroids, and dwarf planets in our solar system. Find out how they orbit, how long they take, and how they look in the sky.

Learn about the Sun, the planets, the dwarf planets, the satellites, the asteroids, the comets and the interplanetary medium. See diagrams, comparisons, sizes, orbits, classifications and more.