Well the plot of this Episode was to fix the timeline by erasing it and making a new timeline. But did it really get erased?
There are several theory's on what would happen if you went back into time and changed events.
Now one of the theory's is that when you go back into time and change an event the original timeline is erased and a new one is created.
There is another theory that when you go back into time and change and event insteid of erasing the original timeline a Parallel timeline (i think set in a parallel universe) is created in which everything up to that point is the same as as the original timeline. So the original timeline is not erased.
Now Sheppard was sent into the future in the normal timeline. He is sent back into time to try to change the timeline. When he gets back it was 12 days for the rest of the people back on Atlantis in which he had been missing. Now in the original timeline he never came back at that time and came back to Atlantis in the future.
So the question is that when John Sheppard went back into time to make a new timeline did he erase the other timeline that he came from or just make a new timeline and the original timeline stays and is not changed.
I think that they implied that he erased the original timeline (which was shown in flashbacks) and created a new timeline in which the rest of the show will take place.
There are several theory's on what would happen if you went back into time and changed events.
Now one of the theory's is that when you go back into time and change an event the original timeline is erased and a new one is created.
There is another theory that when you go back into time and change and event insteid of erasing the original timeline a Parallel timeline (i think set in a parallel universe) is created in which everything up to that point is the same as as the original timeline. So the original timeline is not erased.
Now Sheppard was sent into the future in the normal timeline. He is sent back into time to try to change the timeline. When he gets back it was 12 days for the rest of the people back on Atlantis in which he had been missing. Now in the original timeline he never came back at that time and came back to Atlantis in the future.
So the question is that when John Sheppard went back into time to make a new timeline did he erase the other timeline that he came from or just make a new timeline and the original timeline stays and is not changed.
I think that they implied that he erased the original timeline (which was shown in flashbacks) and created a new timeline in which the rest of the show will take place.
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