Yag'Dhul

Yag'Dhul, a small dense planet with three moons, is the homeworld of the alien species known as the Givin. The complex interaction of orbits and rotations between Yag'Dhul and its moons means that the planet is continually beset by massive tidal forces powerful enough to pull the water and the atmosphere to different locations, exposing large areas of the planet to hard vacuum. While some animals on Yag'Dhul survive by traveling along with the tides, the Givin have evolved a hard, sealable exoskeleton which allows them to survive in vacuum. The Givin inhabit hermetically sealed cities built to withstand the strongest tides, and their society is organized around complex mathematics due to the importance of predicting the tides and the advanced calculations necessary to do so. Technology on Yag'Dhul is quite advanced, and the Givin are respected starship builders. [GG4]