King Daniel Into Darkness wrote:
If you're going by the DTI books, it depends what method of time travel was used. Black holes branch off another reality, wheras other methods alter the existing timeline. I guess the changes before the divergence would affect both timelines.
I always liked this explanation. It helps me see that JJ Trek has not erased the old time line. We see the Mirror Universe as existing parallel to the Prime Universe without erasing anything. In Mirror Mirror Kirk et al. were able to go back and forth from the Prime Universe to the Mirror Universe without creating a new time line.
the TNG episode showed that multiple parallel Universe exist simultaneously. The method of time travel will indicate where you go.
I like the idea or concept that different modes of time travel will get you to different destinations.