Lagrangian Point satellite

Ancient Defense Satelites were satelites that the Ancients used during the war with the Wraith. Placed at the Lagrangian points of the Atlantica solar system, the satelites were powered by naquadah, and were easily capable of slicing a Wraith Hive Ship in half. All but one were destroyed during the first siege of Atlantis. The Atlantis Expedition discovered one left, and used it to destroy one of the three hive ships enroute to Atlantis, but the satelite was destroyed