Terran Defense Grid

Mirror universe
(coexisting on another dimensional plane)

In the mirror universe, the Terran Defense Grid was the name for Terra's planetary defense system in the 23rd century.

In 2255, Captain Sylvia Tilly informed Emperor Philippa Georgiou that the ISS Discovery would go to maximum warp upon leaving the Terran Defense Grid. (DIS: "Terra Firma, Part 1")

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