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Originally Posted by KC_Connection

https://memory-alpha.fandom.com/wiki/Omicron_Theta

Omicron Theta where Data/Lore were built by Dr. Noonien Soong had two moons.

Something interesting from the wiki:

In the novel Cold Equations: The Persistence of Memory, Doctor Bruce Maddox is contemplating deleting Data's memory engrams from B-4, who is kept in storage along with the remains of Soong's other prototype, Lore, and Lal, Data's daughter, when they are stolen by the Breen. Doctor Soong – who survived his death by transferring his mind into an android body far more Human in appearance than Data's – manages to recover his "children", and transfers Data's memories from B-4 into his own body, unable to complete the new body he had been attempting to construct for his "son".