All the following information can be found in the novel. The relevant page references (from the hardcover first edition of The Host) are in parenthesis.
The Souls have discovered and inhabited many other worlds besides Earth. The following is a list of the planets and the various alien species mentioned by Wanderer. She notes that she has lived on nine planets and there are four she hasn’t visited yet, which brings the total number of known planets to thirteen. Wanderer has lived on the Origin, Earth, the Spider Planet, the See Weed Planet, the Mists Planet, the Singing World, and the Flower Planet. She never confirms it, but the students observing her insertion also believed she lived with the Dragons. Her additional planet was either the Summer World or the Vulture World, but she never states which of the two she lived on.
Earth
