Krezylend Moon
Former moon of the Krezylend world, the Krezylend Moon had a rather insignificant and tenuous atmosphere with possibly small watery bodies on its surface.
The moon was comparably closer to the main planet in terms of distance, than e.g. Earth's Luna. The shorter distance between these two planetary bodies was one of the factors which enabled the civilization living on the surface of Krezylend to be able to actually get to the moon. Had the moon been farther away, it would've probably taken the primitive Krezylenders additional decades to reach it.
The Krezylendian expedition to the moon was apparently able to construct a small outpost of some sort on the surface of the moon. The outpost was apparently used as a storage yard for unknown material.
Disappearance
The immense explosion caused by the Krezylend planet's destruction in a Cold Fusion chain reaction threw it away from its orbit, and later it vanished due to one reason or the other, probably drifting out of the First Star system.