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Multiple realities
(covers information from several alternate timelines)
For the Starfleet agency, please see Planetary Defense Systems.

A planetary defense system was a network of space-based and/or ground-based defenses intended to protect a planet from attack.

Federation examplesEdit

MarsDefensePerimeter

The Mars Defense Perimeter

Deep space 9

Starbase Deep Space 9

In the 23rd century, Earth was protected by the Earth Defense Network. (Star Trek: The Motion Picture)

In 2258 of the alternate reality, Earth's border protection grids had several access codes which were known to Starfleet captains. Nero captured Christopher Pike and tortured him to learn the codes. (Star Trek)

The inner Sol system was defended by the Mars Defense Perimeter, which was breached in early 2367 by a Borg cube en route to Earth. (TNG: "The Best of Both Worlds, Part II")

In 2369, when Starfleet assumed operational control of Deep Space 9, the station became a planetary defense system for Bajor as one of its main duties was to protect the planet from hostile attack. (DS9: "Emissary")

In 2372, the sabotage of Earth's power relay grid left Earth "defenseless" as sensors, transporters, and surface-based defense installations were taken offline. (DS9: "Homefront")

During the Dominion War, Betazed had antiquated and undermanned planetary defense systems, which proved little match for an invading Dominion force in 2374. (DS9: "In the Pale Moonlight")

Non-Federation examplesEdit

Apollo's hand grips the Enterprise, remastered

Apollo's hand

Echo papa 607 under fire

Minosian Echo Papa 607 drone

Tygokor

Klingon defenses around Ty'Gokor

Cardassian orbital weapon platform

Cardassian orbital defense platforms

The Romulan Star Empire used cloaked mines to defend recently annexed planets in the 22nd century. (ENT: "Minefield")

In 2267, the USS Enterprise encountered Apollo's hand near the planet Pollux IV. This enormously-powerful force field was capable of stopping the ship from approaching the planet, preventing it from firing its weapons, and also preventing escape. (TOS: "Who Mourns for Adonais?")

The Aldeans, until 2364, used a high-powered repulsor beam to repel any unwanted ships from the planet's orbit, as well as a powerful shield and a cloaking device. (TNG: "When The Bough Breaks")

The Echo Papa 607 weapon system of Minos could act as an effective planetary defense system, repelling attackers in space and on land. (TNG: "The Arsenal of Freedom")

A moon in the Gamma Quadrant, home of the Ennis and the Nol-Ennis, had a sophisticated array of orbiting satellites which inhibited transporter functions, and also actively sought out and attacked orbiting vessels. (DS9: "Battle Lines")

After the Klingon invasion of the Cardassian Union in 2372, the Klingon Empire deployed orbital defense systems around the planets they had captured. (DS9: "The Way of the Warrior")

The planetary defense systems of Korma included system-5 disruptors. They were overwhelmed by Klingon forces in 2372. (DS9: "Return to Grace")

A planet of the Mokra Order visited by USS Voyager in 2372 was defended by numerous surface-based phased ion cannons. (VOY: "Resistance")

Chancellor Gowron moved the Klingon military headquarters from Qo'noS to Ty'Gokor in 2373. Ty'Gokor was protected by a powerful defensive shield and a tachyon detection grid, along with a large number of warships and space stations. (DS9: "Apocalypse Rising")

In late 2374, during the Dominion War, the Cardassians developed unmanned orbital weapon platforms to protect planets. The platforms were deployed in the Chin'toka system and around Cardassia Prime. (DS9: "Tears of the Prophets", "What You Leave Behind")

See alsoEdit

Background informationEdit

A cut bit of dialogue in the script of Star Trek: First Contact would have established that in 2063 Earth did not have planetary defense systems.