The Earth is the third planet from the Sun and the sixth largest planet in the solar system. It is not a perfect sphere, with its equator circumference being about 24,901.55 miles. The Earth has layers including the crust, mantle, inner core, and outer core. It rotates on its axis once every 23 hours, 56 minutes and 4.1 seconds and orbits the Sun at a distance of approximately 938,900,000 km completing its orbit every 365.25 days.