The 8 planets of the solar system
Mercury
The definition of Mercury is the closest planet to the sun. Facts About Mercury the Planet Mercury is composed of an iron core which is at least partially molten. That is surrounded by a mantle, which is rocky, and a crust.
Mars
The planet Mars is the fourth planet from the sun and named after the Roman God of War and is also called the Red Planet. See what makes Mars tick with this Space.com infographic looking inside the Red Planet.
Earth
Earth The third planet from the Sun and the densest planet in the solar system. Earth is a terrestrial or inner planet consisting of a thin outer crust, an intermediate mantle, and a dense inner core.
Saturn
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth. It is very well known for it's glorious rings.
Uranus
Freebase(0.00 / 0 votes)Rate this definition: Uranus. Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both are of different chemical composition than the larger gas giants Jupiter and Saturn.
Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. ... Jupiter and Saturn are gas giants; the other two giant planets, Uranus and Neptune, are ice giants.
Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
Venus
Venus is by far the hottest planet in the Solar System, with a mean surface temperature of 735 K (462 °C; 863 °F), even though Mercury is closer to the Sun. Venus is shrouded by an opaque layer of highly reflective clouds of sulfuric acid, preventing its surface from being seen from space in visible light.
