Burroughs-6

"... there is considerable debate over whether or not it qualifies as an “Earth.” Most researchers consider it to be part of a wholly alternate universe. A small minority classify it as a “Future Echo,” saying it could be Earth a billion or more years in the future. Some projections of stellar positions seem to bear this out, but the data is inconclusive, and such a hypothesis raises far more questions than it answers."
==References==
*GURPS Lands Out of Time pg 38
Category:Infinite Worlds
Category:Quantum 3
Category:Unknown Mana