Inhabited by Spacer descendants Solaria is the 50th and last Spacer world settled. It had perhaps the most eccentric culture of all of them. Originally, there were about 20,000 people living in vast estates individually or as married couples. There were thousands of robots for every Solarian. Almost all of the work and manufacturing was conducted by robots.
Solarians hated physical contact with others and only communicated with each other via holograms. A few hundred years after Elijah Baley's visit to the planet, Solarians retreated from the Galactic scene and fled underground. The Solarians genetically altered themselves to be hermaphroditic and have the ability to use telekinesis. They specially made robots that were made to kill any foreigners who came to the planet.