well ... even if there was a naturally occuring wormhole, i think you can go to future and come back ... i'm not sure how you can go farther back in time
could you show me a link that illustrates your point?
^I'm not tryina argue ... just trying to understand the basic concepts :)
from my understanding of wormholes, you can use a wormhole to build a time machine to go back in past.
However, i think you cant go back in time before the time machine was built... right? or is there a way around?