Multiple realities
(covers information from several alternate timelines)
Examples of planetary defense systems
The Mars Defense Perimeter
Deep space 9
Deep Space 9
Apollo's hand grips the Enterprise, remastered
Apollo's hand
Echo papa 607 under fire
Echo Papa 607
Cardassian orbital weapon platform
Orbital weapon platforms
For the Starfleet agency, please see Planetary Defense Systems.

A planetary defense system was a system of defense platforms and countermeasures designed to protect a planet from attack or invasion. An example of a system was the Earth Defense Network.

Examples of Federation defense systemsEdit

Earth's planetary defenses had several access codes which were known to Starfleet captains. Nero captured Christopher Pike and tortured him to learn the codes. The defenses were inoperable when Nero started drilling into San Francisco bay, though the timely arrival of the USS Enterprise stopped him. (Star Trek)
In early 2367, a Borg cube en route to Earth encountered a small fleet of ships in orbit of Mars, dubbed the Mars Defense Perimeter. It was effortlessly dispatched by the cube. (TNG: "The Best of Both Worlds, Part II")
When the Deep Space 9 space station was taken over from the Cardassians by the Federation in 2369, the station itself became a planetary defense system for Bajor, and one of its main obligations was to protect the planet from hostile attacks. (DS9: "Emissary")
Following the sabotage of Earth's power relay grid sensors, transporters, and surface-based defense installations were taken offline leaving Earth "defenseless". (DS9: "Homefront")
Betazed had antiquated planetary defense systems, which proved little match for an invading Jem'Hadar army during the Dominion War. (DS9: "In the Pale Moonlight")
The planetary defense system of Earth in 2375 was not strong enough to hold back the surprise Breen attack that occurred. Their ships inflicted considerable damage on Starfleet Headquarters. (DS9: "The Changing Face of Evil")

Examples of non-Federation defense systemsEdit

The Romulan Star Empire used cloaked mines as a type of defense system as early as the 22nd century to prevent alien invaders landing on their planets. (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 land-based or orbiting invaders. (TNG: "The Arsenal of Freedom")
The 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, the Klingon Empire deployed orbital defense systems around the planets they had captured. (DS9: "The Way of the Warrior")
Chancellor Gowron moved the Klingon military headquarters from Qo'noS to Ty'Gokor. Ty'Gokor was protected by a powerful defensive shield and a tachyon detection grid, along with a large number of ships.
During the Dominion War (2373 - 2375), the Cardassians had developed an orbital weapons platform system to protect otherwise undefended regions of their space, such as the Chin'toka system. (DS9: "Tears of the Prophets")

Other referencesEdit

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.

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