Earth
CategoryInner Planet
SystemSolar System
Diameter12742 km
Orbital Period365.25 days
About Earth
The only known planet with confirmed life. 71 percent covered in water. The magnetic field generated by the liquid iron core protects against solar radiation. Plate tectonics recycle the surface over hundreds of millions of years. The atmosphere is 78 percent nitrogen and 21 percent oxygen. The only planet not named after a god.