Planets
Earth
Our home planet, the third from the Sun
About Earth
Earth is the third planet from the Sun and the only known planet to harbor life. Its surface is 71% water, and it has a protective atmosphere that shields life from harmful solar radiation.
Scientific Facts
Earth orbits the Sun at about 107,000 km/h. It has a diameter of 12,742 km. Its atmosphere is composed of 78% nitrogen and 21% oxygen.
Interesting Facts
Earth is the only planet not named after a Greek or Roman god. It has the largest moon relative to its size in the Solar System.
Fun Facts
Earth's rotation is slowing down, adding about 1.8 milliseconds to a day every century. There are more than 1 trillion species on Earth.
Discovery
Earth has been known since ancient times.