Excerpt from the Resoverse Travel Guide: The planet Calas in the Artemis system is one of the most impressive in the entire Resoverse. It is the only known planet on which extraterrestrial structures can be found. These gigantic and long-abandoned structures have inspired everyone since their discovery. Who were their builders and why were they abandoned? The craziest theory is that they are still there, but have evolved to such an extent that we can no longer perceive them. Traveler, your ship to Calas is about to depart. Your cabin is booked. Your access code: “RAUMZEIT 21.” We wish you an exciting time in this unique world. And don't miss Galactic Radio Station 72 for some appropriate electron ic space ambient music.