Earth

Earth (or Sol III) is the third planet of the Solar system, located in the Milky Way Galaxy, and is the homeworld of the Human species. In the history of the universe, Earth has proved a focal point of galactic events and often the battleground of the ongoing war of good and evil.

Description
Earth is a fully inhabited planet with a wide variety of landscapes and life forms, plant, animal and otherwise. Its primary species, Humans, have developed rather uneven levels of technology thanks to the influence of Zordon in creating the Power Rangers, resulting in advanced military weapons (always needed due to constant attacks on the planet) with everyday technology advancing steadily behind them.

History
The Earth is approximately 4.54 billion years old, and has been inhabited by sentient beings for a surprisingly long portion of that, given that Zordon claimed that the battle of good and evil began millions of years ago. As most Rangers have been based on Earth, it has had a rocky and conflict-filled history, somehow managing to survive monsters, aliens, demons and other eldritch horrors with hardly a scratch.