Aurora is an Earthlike planet orbiting the star Tau Ceti (12 ly from Sol). It was the first Spacer planet colonized. Its capital is Eon (20.000 habitants aprox.). As it was highly populated and developed, it was considered the "capital" of the Spacers. The planet had two moons: Tithonus I and Tithonus II.
After the decline of the Spacers, the planet's remaining inhabitants are believed to have emigrated to Trantor. Mycogen , a sector of Trantor, identifies Aurora as the first planet and gives a high value to the Robots, lamenting his lost.