Mavors

It's the Starlyng Universe's Mars! 

In the ancient past, Mavors was host to a thriving and intelligent population, long since lost to the annals of time. There is much mystery surrounding the details of their downfall and subsequent vanishing, although what evidence remains suggests a rapid and insurmountable ecological decline. Their technology, albeit advanced to the point of short-distance space travel, appeared incapable of outpacing their withering planet.

Mavortian records indicate that they had ventured as far as Tellus (which they called another name, approximated by the Humi as Terra), yet there is nothing that survives them on Tellus itself. While many have proposed a possible connection between Mavors and dawn of the Humi, they are but millennia-old theories, persisting without proof.

Nowadays, Mavors is the first and arguably grandest of the many Humi colonies spread across the cosmos. It has been all but transformed into a second Tellus.