You know, something just occurred to me...

The Density is supposed to be farting Stargates into the void, right?

So why are there obviously-ancient old-skool Stargates on The Planet Of The Air-Scrubbers and like that?

Also, what keeps them from dialling home on any of them?

Lastly, if someone else says "We're Not Supposed To Be Here" I shall do something dramatic.