The show has established that there must be something physically inside the ring. This has been reiterated several times, through several worlds burying their gates, and more recently in episode 6.20 Memento when they unearthed their gate and it had large blocks ensuring that no Goa'uld could come back.
They've also stated before that the iris at the SGC closes just a few microns from the event horizon of the wormhole, and that the unstable formation (the splash) disintegrates anything it comes in contact with.
The iris is not blocking the gate and preventing a wormhole from forming, so why doesn't the iris have a big hole burned through it every time it's closed and an incoming wormhole shows up? Shouldn't they have to close the iris after the wormhole has formed every time?
They've also stated before that the iris at the SGC closes just a few microns from the event horizon of the wormhole, and that the unstable formation (the splash) disintegrates anything it comes in contact with.
The iris is not blocking the gate and preventing a wormhole from forming, so why doesn't the iris have a big hole burned through it every time it's closed and an incoming wormhole shows up? Shouldn't they have to close the iris after the wormhole has formed every time?
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