Whatever's coming out of that gate can't be something like an obelisk. The inside of that is round and neat, almost like a shipyard's capital bay. It likely is a "birthplace" for a gigantic nomad ship. Unfortunately you can't go inside of that place with "ghost" even with the Nomad Generator destroyed, because the game instantly kills you even with godmode and a cap8 marduk if you go at a low enough altitude, no matter what. you'd need to modify the system's parameters to remove the trigger that instakills you.