the gate u would dial wouldnt tell anything about there being breathable atmosphere or nothing just that you have to transport one thing to the other otherwise the ancinets should costumized the gate with like a warning beacon that goes once a gate and established itself saying that there is a blackhole on the otherside or a volcano spilling lava everywhere.
so my answer would be they wouldnt know if it was a space gate till they float and die
so my answer would be they wouldnt know if it was a space gate till they float and die
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