Re: Timeline branching going forward *spoilers*
Howso? Spock and Nero travel between them.
They traveled back in time, in the origional timeline. The only timeline.
“We have to learn again that science without contact with experiments is an enterprise which is likely to go completely astray into imaginary conjecture.”
- Evolution of the Solar System, NASA 1976, H. Alfvén & G, Arrhenius, p. 257.