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Earth is a planet in Isaac Asimov's Foundation series.


Earth is the planet upon which humans have lived for longer than anyone remembers. Earth features in one of several Origin Myths found throughout the Galactic Empire. Its history, however is shrouded in the mists of time.

Earth was the third planet from its sun (called Sol) and had one large moon (Luna).

In the pre-Imperial era, Earth is described as an overcrowded planet suffering from environmental degradation. These circumstances force the inhabitants to live in vast domed Cities, and submit to compulsory euthanasia at age sixty.

Humans from Earth colonized the Spacer and, later, Settler planets; an anti-Earth plot causes the planet's crust to become radioactive, greatly reducing its population. Many small empires rise and fall throughout the Milky Way Galaxy as various worlds trade with and fight each other. Over time one planet, Trantor, founds a true Galactic Empire. By then Earth is only one of millions of member worlds, and the radioactivity makes it a quarantined backwater. Nuclear radiation covered most of the planet, turning it into a dead world. Eventually, the Galactic Empire was convinced to deliver new, unpoisoned soil to the planet, but for some reason the project was cancelled.

By 827 G.E., only twenty million people live on Earth.[1] Most non-Earthlings are skeptical of the scholarly theory that the obscure planet is the original home of all humans, believing that humans evolved on many planets simultaneously. By 12000 G.E., although many believe that humanity originated on one planet, Earth is one of several candidates.

It was once written that Earth was the planet that developed the positronic brain, the reasoning engine inside the robots that enabled humans to settle the galaxy.