Recent articles
Pluto
Pluto is the ninth and smallest planet of our solar system. It was discovered by the astronomer Clyde Tombaugh at the Lowell Observatory in Arizona on February 18, 1930 (although the body was first ... Read more
Neptune
Neptune is the eighth planet from the sun. It is a gas giant.
After the discovery of Uranus, it was noted that the orbits of Uranus, Saturn, and Jupiter were not acting according to the laws ... Read more
Uranus
Uranus is the seventh planet from the sun. It is a gas giant.
Uranus is composed primarily of rock and various ices, with only about 15% hydrogen and a little helium (in contrast to Jupiter a ... Read more
Saturn
Saturn is the sixth planet from the Sun. It is a gas giant, the second-largest planet in the solar system after Jupiter.
Saturn is probably best known for its famous planetary rings. They wer ... Read more
Jupiter
Jupiter is the fifth planet from the Sun and by far the largest in the solar system, more than twice as massive as all the other planets combined (318 times Earth). Some people have described our s ... Read more
Mars
Mars is the fourth planet in the solar system, named for the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color.
Mars has always fascinated people. Its re ... Read more
Earth
Earth (or the Earth) is the third planet of the star called in English the Sun or Sol; it is the only planet known to be capable of supporting life.
The interior of Earth is, like the other t ... Read more
Venus
Venus is the second planet from the sun, named after the Greek goddess Venus. It is a terrestrial planet, very similar in size and bulk composition to Earth; it is sometimes called Earth's "sister ... Read more
Mercury
Mercury is the closest planet to the Sun, and the smallest aside from Pluto.
Mercury has no natural satellites and only trace amounts of atmosphere. Its surface appears very similar to Earth' ... Read more