One interesting fact about Earth is its status as the fifth planet in terms of size but the densest of all. It also ranks as the largest of the terrestrial planets in the solar system and the only one on which water exists in liquid form on its surface.
This last fact makes Earth very different from the other planets because water supports life as it is known on this body, and approximately 71 percent of Earth's surface is covered in it.
Earth is the only one of the eight planets not named for a mythological being. Its name comes from "ertha," an Old English word for "ground" or "land."
The earth's rotation on its axis takes about 24 hours but is slowing down slightly. It has the fastest rotation of the terrestrial planets but rotates more slowly than the gas giants.