Earth. It's where we keep our stuff.
- "Mostly harmless."
- ―The Hitchiker's Guide to the Galaxy
Third Earth 
|Galaxy:||Milky Way Galaxy|
|Residents:||Humans; Atlanteans; Monkeys|
|Points of interest:||Continents; Countries; Regions; Islands; Counties; Cities; U.S. States|
Earth is the third planet from the sun in the Sol system in the Milky Way Galaxy. It has one satellite and is traditionally depicted as the only planet in the system capable of sustaining human life. Many resources have ascribed life to the other 8 (or seven) planets in the Sol system, in particular, the planet Mars.
In terms of planetary classification, Earth is considered an M-class planet, characterized by an abundance of surface water and an atmosphere high in nitrogen, with oxygen and trace elements.
In Sci-Fi Edit
In the mythos of Doctor Who, Earth was considered a Level 5 civilization in accordance with Galactic Law up until and including the late 20th century.  Level 5 civilizations where characterized by dominant life forms of a relatively primitive class who had yet to reach a point in their development where they were recognized by cultures from other worlds. Generally speaking, planets with Level 5 civilizations had yet to master the science of long-term space travel.
It could be argued that the fictional history of the Earth began and ended with the Doctor Who franchise. In chapter four of the "City of Death" serial, the alien Jagaroth known as Scaroth came to Earth four-hundred million years ago. His presence on the planet jump-started the world's evolutionary life cycle, ultimately yielding the dominant life forms that exist on Earth today. In "The End of the World" episode of the 2005 Doctor Who revival series, the Ninth Doctor brings his newest companion Rose Tyler 5 billion years into the future to the day that the sun expands and a gigantic solar flare turns the Earth into a cinder.
On the TV series Firefly, Earth "got all used up" and was no longer occupied but any of the planet's former major super powers. All of Earth's surviving citizens colonized other worlds, but brought with them many elements of their home planet's culture, including elements of Chinese culture and language as well as fashion and design styles reminiscent of the American southwest.
Points of Interest Edit
Alternate Realities Edit
- In the Canadian/UK sci-fi series Lexx, Earth is referred to as the "Light Zone".
- Space mercenary Johner regarded Earth as a "shit-hole". 
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