"Star Trek" fans have labeled the new J.J. Abrams movie as being set in an alternate timeline. Alternate because it is different from the established history of the Star Trek universe.
The word alternate here also seems to imply that the original timeline must be continuing as it was, and the new timeline is a branch of the original.
Assuming the two timelines continue to move forward does this mean they are in fact parallel universes? Is that a reasonable wording?
Are parallel universes and alternate timelines the same thing or are they completely different concepts?