Rhamnousia

A massive singularity on the edge of Romulan space bordering the Uncharted Territories. This black hole generates many unussual phenomena and many Romulan ships have been lost trying to study it. The known recorded phenomena are unstable wormholes, temporal rifts, and even a rogue planet called Nemesis that orbits the black hole just outside of the event horizon.

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Uncharted Territories
Nemesis

Rhamnousia

Star Trek Late Night Deykaras