Earth is the third planet in the solar system in terms of distance from the Sun. The Earth was formed around 4.57 billion years ago and its largest natural satellite, the Moon, was orbiting it shortly thereafter, around 4.533 billion years ago.
The Earth's shape is that of an oblate spheroid, with an average diameter of about 12,742 km. It is the fifth largest planet in the solar system, leading some to claim that "it's a small world after all." The world's shape was first discovered by a Pangaean teenager, Charlene Sinclair.
It takes the Earth, on average, 23 hours, 56 minutes and 4.091 seconds to rotate around the axis that connects the north pole and the south pole. This movement is usually undetectable to surface residents, although Loretta Swit claims, in The Muppet Show episode 502, that she can "feel the Earth move under [her] feet." In episode 314, Harry Belafonte explains that planetary motion is the result of human connection: "The question is, do I know who you are? Do you know who I am? Do we care about each other? Cause if we do, we can turn the world around." The Earth's center can be reached by elevator.
Earth is often assumed to be the only place in the universe where life is absolutely known to exist, and there are many who claim that "we are all Earthlings." However, there have been many documented sightings of off-world visitors, including guests from Mars, Koozebane, Hyneria, and a galaxy far, far away.
Earth is currently home to a diverse array of flora, fauna, and inanimate objects. 70.8% of the Earth's surface is covered by bodies of water. The terrain includes mountains, deserts, valleys, and plains. Earth's land masses are divided into seven continents: Africa, Europe, Asia, North America, South America, Australia, and Antarctica. Uncle Traveling Matt is the only Fraggle to venture "all around the world", while Grover is also a seasoned world traveler.
Unbeknownst to most of the inhabitants of Earth (except for the dolphins and the mice), the planet is actually a highly advanced supercomputer constructed by Deep Thought for the purpose of determining the question to the ultimate answer of Life, the Universe and Everything. The planet was destroyed on a Thursday by a Vogon constructor fleet, to build a hyperspace bypass. However, an exact copy of the Earth was constructed in its place.