Corrected entry: The premise for Jackson going on the mission is that once on the other side someone would need to be able to re-open the gate using new symbols, but in reality it would just be a matter for earth to re-open the gate from their end at a predetermined time or times.
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Correction: The gateway is a one way trip, you can't go back through the wormhole when the gate has been opened from the other side.
lionhead
Pure assumption. We don't know exactly how the stargate works. It may actually be possible to go back through the stargate, even if you just came through and it was still open. We just don't know.
It has been well established that Stargate travel is one-way.
It was established in the TV series that two-way travel was not possible; however, many consider the movie not to be canon so information from the series is not necessarily applicable.
Noman ★
Since when?
After Jackson says he doesn't know how to dial back, when they are setting up camp, Brown says "if we're not back soon, they'll just turn on the gate from the other side", and Ferretti tells him "no, it doesn't work that way, you see, if you don't turn it on from here, we're screwed." The one way travel is also stated in the later TV series.
jimba
Since always.
lionhead