We all know by now of the extremely interesting episodes in SG1 and SGA involving traveling in time by mistake through the stargates. Personally I think there are some very deep philosophical implications tied up with it. For instance, it should be assumed that if some Rodney McKay or Sam Carter changed a timeline, the rest of mankind would have no knowledge or memory of such an event at all. For that matter, someone could have changed a timeline yesterday somehow and today we'd know nothing of it.
What happens to the lives of all the billions of people whose world is changed by a new timeline? Do they simply go "poof" out of existence, out of all their years of life and existence, and find themselves in a new reality with a new history and background?
How did John Shepard know of the changed timeline when he returned back to the original Atlantis? Shouldn't he have now been the original Shepard, and not the Shepard who knew of the changed history from the McKay hologram?
What about Elizabeth Weir? Why didn't the young Weir remember anything of the Weir in stasis for thousands of years?
What about the SG1 team that went back into the year 1969? What happened to their lives and memories?
In the case of General Hammond, why didn't the older Hammond remember the encounter with the SG1 team from his youth? Or did he?
And if he did, wouldn't that process repeat itself infinitely?
What happens to the lives of all the billions of people whose world is changed by a new timeline? Do they simply go "poof" out of existence, out of all their years of life and existence, and find themselves in a new reality with a new history and background?
How did John Shepard know of the changed timeline when he returned back to the original Atlantis? Shouldn't he have now been the original Shepard, and not the Shepard who knew of the changed history from the McKay hologram?
What about Elizabeth Weir? Why didn't the young Weir remember anything of the Weir in stasis for thousands of years?
What about the SG1 team that went back into the year 1969? What happened to their lives and memories?
In the case of General Hammond, why didn't the older Hammond remember the encounter with the SG1 team from his youth? Or did he?
And if he did, wouldn't that process repeat itself infinitely?
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