The Stargate hub is a room located on an Ancient-built space station. In the hub, there are five Stargates forming a circle around the center of the room. Lt. Colonel John Sheppard and his team found the hub when they used a new gate address while searching for Zero Point Modules. The gate they used to leave the hub sent them to an Ancient lab/base on Earth's Moon. (SGA: "Stargate Atlantis: Back to Pegasus 2")
After being trapped on Walter's world for a while, Chuck and Walter Harriman find the Dial Home Device for the Stargate on the planet, and use it. They end up arriving at the Stargate Hub. (SGA: "Singularity 1")
