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A planetary shield (or defense grid) was a large scale deflector shield designed to protect an entire planet from bombardment, falling debris, or other hazards. The term planetary shield may also have been used for a large scale shield protecting a moon such as Nar Shaddaa.
The first deflector shields were developed to protect individual starships against various space hazards including attacks from other ships. The technology was later adapted for use aboard space stations, but the shields remained best suited to repelling starfighters.
Shield technology was first expanded from protecting starships to entire planets in 3632 BBY to protect Odessen. Doctor Juvard Illip Oggurobb developed the technology on behalf of the Alliance in time for Arcann's attack at the Battle of Odessen. The planetary shield prevented the Eternal Fleet from bombarding the Alliance base and forced the battle to be space-based confrontation.
Planetary shields could be scaled to cover bases, cities, or even entire planets. One of the two main types of planetary shields, encasing shields (like the second Death Star's), prohibited friendly fire from beneath the shield except through small gaps. Encasing shields could be curved to protect orbiting objects and seriously damaged the systems of craft that passed through them. The second type of planetary shield, a shutter shield, was more versatile in that segments could be moved to overlap others for increased defense, but shutter shields did less damage to craft passing through them and could not be oriented in a curve. The Rebel base on Hoth employed shutter shields. Both types of planetary shields fouled sensor scans. Pacifistic planets like Alderaan and Naboo, often relied on passive defenses like planetary shields instead of using more aggressive measures to ensure the populace's safety. The former was stated to be as strong as the defensive systems of the Empire.
Battlestations such as Torpedo Spheres or Death Stars were designed to penetrate planetary shields. When such weapons were unavailable, planetary shields were often sabotaged as a prelude to either conquest (as in the conquest of Mon Calamari), or an orbital bombardment (as in the destruction of Caamas or the Second Battle of Bothawui).
- Timeline 5: The Battle of Bothawui
- Star Wars: The Old Republic: Knights of the Fallen Empire
- Star Wars: The Old Republic: Knights of the Eternal Throne (Mentioned only)
- Star Wars: Episode IV A New Hope (First appearance)
- LEGO Star Wars II: The Original Trilogy (Non-canonical appearance)
- Star Wars 11: Star Search! (Mentioned only)
- "A World to Conquer"—Star Wars Adventure Journal 2 (Mentioned only)
- Star Wars: Episode VI Return of the Jedi
- Star Wars Episode VI: Return of the Jedi novel
- Star Wars Episode VI: Return of the Jedi junior novel
- X-Wing: Wedge's Gamble
- Dark Force Rising
- The Last Command
- "Retreat from Coruscant"—Star Wars Adventure Journal 7
- Dark Empire 4: Confrontation on the Smugglers' Moon
- Jedi Search
- Specter of the Past
- Vision of the Future
- The New Jedi Order: Star by Star
- The New Jedi Order: Ylesia (Mentioned only)
- The New Jedi Order: Force Heretic I: Remnant
- Legacy of the Force: Tempest
- Legacy of the Force: Inferno
- Legacy of the Force: Revelation
- Assault on Hoth (As "Ground Defense Shield")
- Death Star Technical Companion
- Star Wars Gamemaster Handbook
- Dark Empire Sourcebook
- Death Star Technical Companion, Second Edition
- Han Solo and the Corporate Sector Sourcebook
- "Uninvited Guests"—Star Wars Adventure Journal 1 (As "force shield")
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- The Essential Guide to Weapons and Technology
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- Star Wars: Revenge of the Sith Incredible Cross-Sections
- The Official Star Wars Fact File 138 (DEF5-6, Deflector Shields)
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