# If two places in the infinite universe have the same state and history, is there a way determine they are different locations? [closed]

I've heard it said that in an infinite universe if you could go far enough in one direction you would end up in a location identical in every aspect to the one you left. Same Earth, same culture, same night sky, same age, same laws, same everything.

Is there a way to tell that it is different locations rather than the same one, or would that require an absolute reference frame?

• I've heard it said that in an infinite universe if you could go far enough in one direction you would end up in a location identical in every aspect to the one you left. Same Earth, same culture, same night sky, same age, same laws, same everything. Where have you heard this? It certainly is not mainstream. – Aaron Stevens Sep 22 '19 at 21:45
• You probably heard about doppelgangers in the context of speculative-but-reasonably-respectable physics regarding a multiverse. For example, see this popular account. You can’t travel to the other universes where another Earth or another you is. – G. Smith Sep 22 '19 at 22:31
• Possibly related to this question: physics.stackexchange.com/q/132661 – D. Halsey Sep 22 '19 at 22:35
• in an infinity of time and an infinity of space all things will happen, if it does not just wait, but this is more philosophical than physics – Adrian Howard Sep 23 '19 at 2:44

Actually, in order to reach a near-twin Earth, you would probably have to travel some silly distance like $$10^{10^n}$$ light years, where $$n$$ is pretty big. In that time, the conditions in the universe will have changed drastically -- to the point where there is no longer any life or consciousness.