SS Bekenstein, CCV-675. That is the name of the civilian colony vessel that was reported missing a decade ago during the last colonization push of the 2150s. She had over 10,000 colonists on her passenger list. In December 2157, she departed from Starbase 5 to make for a habitable planet just a single relay jump away. Instead, she disappeared and all attempts to find her were futile.
She then found her way back. While speaking to the elected governor, former Captain Miller Allers, we learned the story of what happen to those colonists.
According to their records, they suffered a navigation error, causing the relay at Arcturus to be misaligned. Instead of a 50-light year jump, they traveled over 30,000 light years, emerging in the Window System, where the Citadel is. There, their nav system failed entirely and they wandered out of the Scorpion Nebula. Somehow, they never stumbled upon the Citadel. Citadel Traffic Control did record an anomaly at the relay they emerged from, but deemed it too minor to investigate. Warp capable Terran ships leave a far smaller detection signature when leaving a relay than Council ships.
After flying at low warp for a month, they discovered a solar system unknown to both Terran and Council stellar cartographers, which they dubbed the Boltzmann system. Low on resources and unable to return, they found a habitable planet. With no other choice, they colonized the planet and named it Bekenstein, after the ship and the scientist.
With no QEC and only short range hyperspace radio, the planet was isolated. Loaded with industrial equipment, the colonist formed their new government and set out to build a civilization on their new, unknown world. The captain who discovered planet was soon elected their governor. With the resource rich planet, they set out to create an industrial world, focused on building a new ship to reconnect with the home world.