Ancient Gate, the

a circular, artificial construct of alien origin and great age, creating a trans-spatial short cut between two  points in space. There are trans spatial gates associated to three distinctive cultures (found so far)
 * There are the Traveler Gates, the gates the Travelers made available to the Golden.
 * The Ring gates (Only two known gates exist) the ring gates appear older than all the others and are substantially larger than the other known gate types. (The Ring of Algorm ) is one and the connecting gate in the Pictu galaxy the other)
 * And there are the gates of the Ancient Gate Network . Two distinctive 'lines' of AG have been identified so far. The Phoenix Spur and the Line to Avondur