The International Astronomical Union recognizes eight planets in our solar system. Each one orbits the Sun, has enough mass and gravity to maintain a roughly spherical shape, does not undergo nuclear fusion in its core, and has cleared its orbit of neighboring asteroids and other minor planets. The composition of planets ranges from rocky to gaseous to icy or combinations of these. Some planets have a significant atmosphere and/or magnetic field, while others may lack one or both. Some planets have natural satellites, while others do not. Discover these and other properties of the planets using Wolfram|Alpha.
Query for planets by name or compare them with other planets. Because they move with time, you can also ask for properties of a planet taking the specified date into account.
Explore mountains, craters and other surface features on Mars, Venus and Mercury.
Explore properties of planets, which range from inherent physical properties to position- and velocity-related properties.