P4X-639 is a barren rocky planet, subject to regular cycles of coronal mass emissions which disrupt the planet's magnetic field and increase surface radiation. It had once been a colony of the Ancients, but only the ruins of an ancient time machine now remain. The writings on the walls and the altar near the device are a variation of the writings of the Ancients, similar to Latin. The inscription reads, "Domavatus Vestul Motabilium," or "Master of an Uncertain Past," and the equivalent of 400 pages of alien text includes a history of the inhabitants. They had built the time machine to save themselves from a cataclysm, but instead it had caused a short term continuous loop until they shut it down and let the end come.

Cross Reference: Ancients, Malikai, Joseph Mallozzi, Time Loop

Episode Reference: Window of Opportunity