Supergate

The forces of the Ori made this 400m wide supergate in order to get their armada of ships to the milky way. Only two of these exist now, one orbiting the non-existent ori home-world and an one way version (cannot get to but it can get to you) in the andromeda galaxy. The wormhole is generated when all segments receive and electro-static charge from the previous one. The only way to dial the gate is from an onboard computerized DHD.