Omicron Theta was the location of an Earth colony, the Omicron Theta colony. By 2328, this planet was a destination on commercial transport routes. In the colony, Dr. Noonian Soong and his wife Juliana perfected their positronic brain and successfully created a series of Soong-type androids, including Data and Lore. At least one archaeological dig was conducted in the mountains. The colony also contained farmland. (TNG: "Datalore", "Silicon Avatar", "Inheritance")
In 2338, after the planet was attacked by the Crystalline Entity, the cruiser USS Tripoli picked up a signal, which led the starship to this planet. The cruiser reported finding a world with farmlands and a landing party traced the signal to a device on the surface. Near the signal device, the party discovered Data, who was activated by the device and told by an officers that he was an android.
In 2364, the USS Enterprise-D visited the planet for a few hours. The ship's sensors found a class M world with lifeless vegetation and devoid of insects and soil bacteria. An analysis by an away team from the starship ascertained that at the time the Tripoli discovered Data, everything on the planet was dead or dying. (TNG: "Datalore", "Rightful Heir")