Earth, otherwise known as the world, is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets.
Radius: 3,959 mi
Age: 4.543 billion years
Mass: 5.972 Ă— 10^24 kg
Distance from Sun: 92.96 million mi
Population: 7.125 billion (2013) World Bank
Moon: Moon