Atrea IV
Atrea IV, or, more simply, as Atrea, was the inhabited fourth planet in its star system. It was the homeworld of the humanoid Atreans. The planet was governed by the Atrean government.

In 2370, it was discovered that Atrea IV's molten core was solidifying, which was weakening the planet's gravitational field and seismic activity had increased by a factor of three. Dr. Juliana Tainer, a geologist living on the planet, estimated that it would become uninhabitable in thirteen months. The  was sent in response to a request by the planet's government for help in averting this natural disaster. Lieutenant Commanders Data and Geordi La Forge were teamed up with the Atrean geologist Dr. Pran Tainer and his wife Dr. Juliana Tainer. They developed a means to re-liquify the core using a ferro-plasmic infusion, which injected heat into the planet to stabilize the core for centuries. ()

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