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Subspace, also called Hyperspace is an extradimensional plane.


Hyperdrives access subspace to allow vessels to travel at multiple times the speed of light. (SG1: "Within the Serpent's Grasp") When moving through subspace, large enough ships may leave a detectable trace. (SG1: "Thor's Chariot") The Time loop machine uses the Stargate to create a subspace bubble where it can reverse time inside. (SG1: "Window of Opportunity") Energies such as those in a supernova can affect the subspace window used by a hyperdrive to accelerate it to over 800 times its original speed. (SG1: "Exodus", "Enemies") Subspace can be affected by gravity. (SG1: "Memento") A form of power can be extracted from subspace. (SG1: "Origin") Subspace produces a variety of sounds, usually caused by types of radiation. (SGA: "Travelers") The Stargates deposited by the Seed ships used subspace transmitters to send information to Destiny. (SGU: "Common Descent")


The Asgard sent a command to the Replicators through subspace to draw the Replicators to Hala. (SG1: "Unnatural Selection") Niam's group uploaded their consciousnesses to subspace as a means of reaching ascension but they were stuck there. Elizabeth Weir said it was constant motion and deafening noise inside subspace. (SGA: "Ghost in the Machine") The Berzerker drones managed to detect subspace signals from active Stargates to track Destiny. Matthew Scott later came up with idea to send a Morse code signal by turning on and off a Stargate's subspace transmitter. (SGU: "Common Descent")