Alpha orbits the star Alpha Centauri A (only 4.2 ly from Sol). The Empire terraformed this planet to hold Earth's inhabitants after it was devastated by radiation, but the project was never completed. Covered almost entirely with water, save for a fifteen-thousand-square-kilometer island, this planet was considered by Lord Dorwin to be the origin system of humanity. The inhabitants call it New Earth and live a simple lifestyle that of women and men are completely shirtless, weather permitting, and the men engage in long sea voyages to fish.
About halfway into the thousand-year darkness after the fall of the Empire, Golan Trevize ventured to this planet in his search for Earth. The inhabitants seemed nice enough, but tried to infect him and his crew with a disease. After leaving, Trevize headed to the Solar System.
- Alpha first appears in Foundation and Earth, which confirms a merger between the Spacer and Foundation series. In the Spacer series, the planet Aurora in the Tau Ceti system was the first extrasolar colony, suggesting that Alpha Centauri had no habitable worlds. This fits with the late and expensive settlement of Alpha.