
They visit Solaria, a planet peopled with only twelve hundred humans, all living in solitude. They are chased from the planet by a pack of wild dogs. They visit Aurora, a planet with no humans but with ruins of buildings that yield up a clue. The minister allows it because she is superstitious about Earth and believes anyone on a quest for its location is likely to bring down the wrath of "He" who punishes.

Trevize convinces the transportation minister to allow them to leave.


They encounter strange planets, such as Comporellon, where they are detained because the government wants their ship. They travel to a series of locations, each with the hope of finding information that will offer the location of Earth. The three set off in search of Earth and the answers Trevize seeks. Pelorat met a Gaian named Bliss and the two become physically and emotionally involved. Trevize's traveling companion is a scholar - Pelorat - who is knowledgeable in the myths surrounding the existence of Earth. When he reaches that destination, he also discovers that the robot, Daneel, has played a role in his travels, guiding him to that location because Daneel is "dying." Daneel tells Trevize that it was actually the robots, including Daneel, who created several of the worlds and societies, including Gaia. He reasons that if all are part of the greater consciousness, all will be interested only in what is best for the greater good. It's not until he reaches the Earth's moon that Trevize decides that becoming a single organism is the best answer because Seldon's Plan doesn't take into account that intelligent life from other galaxies could interfere with humans, even causing a war and self-destruction. Trevize believes there is something missing and believes the answer lies on Earth. That plan, devised by Hari Seldon, depends on two fundamental truths - that there be sufficient numbers of people involved so that statistical data can be projected, and that the people not be aware of the plan's projected outcomes.

Trevize gradually explains that he has made that decision while discarding the idea of another plan, one that is never explained. Gaia is a planet of a single consciousness, a single super organism, in a sense. The story begins with Golan Trevize asking why he had decided that all of humankind should become part of Gaia. Foundation and Earth is the story of one man's quest to justify a decision he's already made.
