Earth, Lightwave 3D
Pronunciation /ˈɜrθ/
Adjective Earthican, terrestrial
Satellites 1 (Luna)
Physical characteristics
Mean radius 6,371.0 km
Equatorial surface gravity 9.780327 m/s2
0.99732 g
Axial tilt 23°26'21".4119

Earth (or the Earth) is the third planet from the Sun and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the World, the Blue Planet, or by its Latin name, Terra.

Home to millions of species including humans, Earth, along with Luna are currently the only astronomical bodies where life is known to exist. The planet formed approximately 4.7 billion years ago, and life appeared on its surface within one billion years. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist. The planet, as well as its moon, is expected to continue supporting life for at least another 500 million years.


Widely accepted flag of Earth. The large blue circle represents Earth in the center of the flag, a segment of a large yellow circle represents the sun and a small green circle for Luna.