Thalassa was a moon colonized by the Andorian Empire in 1954.

The M class moon orbited the only planet in the Thalassa System, the gas giant Thosa, and suffered from constant volcanic activity.

In 2004 volcanic activity destroyed the original colony.

The resettled colony boasted two spaceports and a science outpost, all in orbit.

Starfleet Officer Cherok ch'D'Arv was born here in 2335.

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