Difference between revisions of "Planetary shield"

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A '''planetary shield''' is a system that projects a single force field that encompasses a planet or projects multiple interlocking fields that provide significant planetary coverage.  The shield exists to protect the planet from attack by space ships and other phenomena, although the degree of protection varies.
A '''planetary shield''' is a system that projects a single force field that encompasses a planet or projects multiple interlocking fields that provide significant planetary coverage.  The [[shield]] exists to protect the planet from attack by space ships and other phenomena, although the degree of protection varies.


==Planetary Shields in ''Star Wars''==
==Planetary Shields in ''Star Wars''==
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=== Star Wars IV: A New Hope ===
=== Star Wars IV: A New Hope ===
[[Image:Alderaanshield.gif|right|300px]]In perhaps the most spectacular demonstration of a planetary shield's power, the [[The Alderaan Argument|destruction of the planet Alderaan]] shows the 'breaking point' of a core-world's planetary shield. The [[Death Star|Death Star I]] fires its planet destroying [[superlaser]] at [[Alderaan]], a beam with a calculated energy of 1E38 J. This energy beam strikes the planetary shield, but the planet does not begin to sustain damage for another tenth of a second. This means that, before giving out, the shield was able to dissipate 1E37 J of energy.
[[Image:Alderaanshield.gif|right|300px]]In perhaps the most spectacular demonstration of a planetary shield's power, the [[The Alderaan Argument|destruction of the planet Alderaan]] shows the 'breaking point' of a core-world's planetary shield. The [[Death Star|Death Star I]] fires its planet destroying [[superlaser]] at [[Alderaan]], a beam with a calculated energy of 1E38 J. This energy beam strikes the planetary shield, but the planet does not begin to sustain damage for another tenth of a second. This may mean that, before giving out, the shield was able to dissipate 1E37 J of energy. However, Star Wars turbolasers seem to have a visible "tracer" component, as well as an invisible portion. Since a second explosion is visible during the destruction, it is likely that the invisible portion struck later. This will make the actual amount of energy absorbed lower. It certainly doesn't seem likely that the Empire designed their ultimate weapon with only 900% overkill against existing civilian targets.


=== Star Wars V: The Empire Strikes Back ===
=== Star Wars V: The Empire Strikes Back ===
In Star Wars V, the [[Rebel Alliance]] is able to utilize a partial planetary shield to protect them from the [[Imperial Star Destroyer]]s' bombardment for some time during the [[Battle of Hoth]].
In Star Wars V, the [[Rebel Alliance]] is able to utilize a "theatre shield" to protect their base on [[Hoth]] from orbital bombardment.  The shield was strong enough to resist fire from several [[Imperial Star Destroyer]]s and a [[Executor-class|Super Star Destroyer]] for long enough to make a surface assault that could slip under the shield necessary, leading to the [[Battle of Hoth]].


=== Star Wars VI: Return of the Jedi ===
=== Star Wars VI: Return of the Jedi ===
This establishes the range of the shield-net itself. A planetary shield generator is employed on the sanctuary moon of [[Endor]], prior to the [[Battle of Endor]]. The shield not only extends to the upper atmosphere of the moon, but all the way out into space to entirely encompass the [[Death Star|Death Star II]] as well. Aboard ''[[Home One]]'', during the briefing given to the pilots prior to the attack on the Death Star II, a holographic projection of the shield indicates that it does indeed reach out in a conical structure to surround the orbiting Death Star.
This establishes the range of the shield-net itself. A planetary shield generator is employed on the sanctuary moon of [[Endor]], prior to the [[Battle of Endor]]. The shield not only extends to the upper atmosphere of the moon, but all the way out into space to entirely encompass the [[Death Star|Death Star II]] as well. Aboard ''[[Home One]]'', during the briefing given to the pilots prior to the attack on the Death Star II, a holographic projection of the shield indicates that it does indeed reach out in a conical structure to surround the orbiting Death Star.  The full extent of the shield is evident from the fact that the shield needs to be dropped in order for a shuttle to land on the moon, not just to approach the Death Star.


Further, in the novelization, it is shown that when a ship crashes into this planetary shield the collision destroys the ship.
Further, in the novelization, it is shown that when a ship crashes into this planetary shield the collision destroys the ship.


==Planetary Shields in ''Star Trek''==
=== Rogue One ===
Planetary shields are occasionally mentioned in ''[[Star Trek]]'', but some are not powerful enough to protect an entire planet from a major attack.  The planet Elba II had a planetary shield that blocked [[transporter]] function and could withstand fire from at least one [[Constitution-class|''Constitution''-class]] [[starship]] aimed at it's weakest point on the far side of the planet. <ref>TOS "Whom Gods Destroy"</ref>; but while no other planetary shield under [[Federation]] control have been explicitly mentioned, there are strong indictations that planetary shields do exist elsewhere in the Federation have been observed:
''Rogue One'' removes all doubt that planetary shields exist in the Star Wars setting. The planet Scarif is surrounded by a planetary shield, and finding a way to circumvent it is a critical plot point. The shield blocks energy and objects (such as starships) as well as placing restrictions on communications through the shield.
 
 
* The Tantalus colony was a Federation penal colony, located on planet Tantalus V, that served as a that served as a prison and hospital during the late 23rd century. Violent criminals were imprisoned there for rehabilitation. The facility was protected from unauthorized transport by a force field of unknown size, but was extensive enough that Captain James T. Kirk and Lieutenant Helen Noel where unable to simply go up to the surface and walk out from under it's influence, and no one on the ''Enterprise'' suggested rescuing the two stranded officers by beaming a security detail to another location on the planet and then have them walk in underneath it to the colony. It is also unknown if weapons fire from a captial ship would be sufficent to overcome the force field. <ref>TOS "Dagger of the Mind"</ref>
 
 
* At least a partial planetary shield was employed on Calder II to protect the Federation science outpost and the archeological ruins being studied there. The deflector shield there was large enough in coverage that no one on mercenary Arctus Baran's privateer starship suggested beaming to location where they could simply walk in and steal the artifacts he and his crew had been hired to obtain. <ref>TNG "Gambit, Part I", "Gambit, Part II"</ref>
 
 
* Chakotay tells Annorax that if Captain Janeway has given other ships temporal shielding that they have undoubtedly informed their home worlds, and will be able to protect their planets from the Krenim time ship's temporal weapon. This indicates that relatively less advanced factions have have planetary shields, and by extension it is likely the Federation does as well. <ref>VOY "Year of Hell, part II"</ref>
 
== Planetary Shields Outside the Federation ==
 
 
* In the 2150's, The Klingon outpost and colony of Qu'vat had at least a partial planetary shield to protect it, which could withstand continuous bombardment from a D-5 battlecruiser's disruptors over several minutes. <ref>ENT "Divergence"</ref>


One glaring flaw, however, is a gate in the shield that allows ships to reach the planet without shutting down the entire shield. The gateway mechanism is not fully enclosed by the shield, making it vulnerable to attack. Should the gateway be destroyed, a large opening is left in the shield instead of it closing completely.


==Planetary Shields in ''Star Trek''==
Planetary shields are occasionally mentioned in ''[[Star Trek]]'' but generally are not powerful enough to protect an entire planet from a major attack.
*The planet Elba II had a planetary shield that blocked [[transporter]] function and could withstand [[phaser]] fire from at least one [[Constitution-class|''Constitution''-class]] [[starship]], but it's not clear whether the shield could have withstood a determined attack.<ref>TOS "Whom Gods Destroy"</ref>  [[Montgomery Scott|Commander Scott]], commanding in the absence of the [[James T. Kirk|captain]] and [[Spock|first officer]], was concerned about damaging the Elba II asylum, which was a sealed habitat in a toxic environment. Consequently, his efforts at penetrating the shield were restrained by the need to avoid rupturing the asylum. Nonetheless, the ''Enterprise'' did try to penetrate the shield using the starship's main phaser banks on full power, attacking a point on the far side of the planet from the asylum where the shield would be weakest, and the attempt failed.  Phaser attacks against surface targets have been sustained for substantially longer, though.<ref>TOS "Who Mourns for Adonais?"</ref>
* The Federation penal colony on the planet Tantalus V was protected by a force field that blocked transporter function, but no attempt was made to defeat the field with starship weaponry.<ref>TOS "Dagger of the Mind"</ref>
* The Federation science outpost on Calder II had a deflector shield to protect it and the archeological ruins being studied there, but there was no indication that this shield protected the entire planet. [[Disruptor]] fire from a single mercenary starship was capable of defeating the shield (an effort made easier with trickery known to a [[Jean-Luc Picard|Federation starship captain]]). <ref>TNG "Gambit, Part I", "Gambit, Part II"</ref>
* [[Chakotay]] told Annorax that if [[Kathryn Janeway|Captain Janeway]] had given other ships temporal shielding technology, they would have shared it with their home worlds, which would be able to protect their planets from the Krenim time ship's temporal weapon. This exchange suggests that such civilizations may have had the ability to shield entire planets. However it should be noted that temporal shields are essentially the normal shields and deflector on ''Voyager'' modified by Seven of Nine and Lt. Tuvok to the frequency and inverse pulse of the Krenim's chroniton torpedoes. Once the frequency modification was in place, they provided protection against the otherwise conventional warheads onboard the torpedoes. Consequently, a defensive fleet of starships with appropriate shielding may well have been sufficient to keep the Krenim at bay.<ref>VOY "Year of Hell, part II"</ref>
* In the 2150's, the [[Klingon]] outpost and colony of Qu'vat had a defensive shield that could withstand a prolonged bombardment from a D-5 battlecruiser's main disruptors.  There was, however, no indication that the shield protected the entire planet, and an [[NX-class]] starship was also able to withstand fire from the cruiser's weapons (albeit for a much shorter period of time).<ref>ENT "Divergence"</ref>
* The planet Aldea had a planetary shield that could block transport and [[cloaking device|cloak]] the planet, but it was never tested against weaponry.  Furthermore, the planetary cloaking shield was an advanced alien technology that the Federation has not successfully reproduced.<ref>TNG "When the Bough Breaks"</ref>
* The planet Aldea had a planetary shield that could block transport and [[cloaking device|cloak]] the planet, but it was never tested against weaponry.  Furthermore, the planetary cloaking shield was an advanced alien technology that the Federation has not successfully reproduced.<ref>TNG "When the Bough Breaks"</ref>
 
* In the [[Delta Quadrant]], the Federation starship ''[[USS Voyager]]'' encountered the Kraylor, whose homeworld had a planetary shield grid capable of resisting energy weapons and preventing ships from physically reaching the surface.<ref>VOY "Nightingale"</ref>
 
* In the Delta quadrant, the Federation starship USS ''Voyager'' encountered the Kraylor whose homeworld has a planetary shield grid that is capable of not only repelling energy weapons, but also prevents ships from physically reaching the surface. <ref>VOY "Nightingale"</ref>


==Notes==
==Notes==

Revision as of 16:36, 29 September 2017

A planetary shield is a system that projects a single force field that encompasses a planet or projects multiple interlocking fields that provide significant planetary coverage. The shield exists to protect the planet from attack by space ships and other phenomena, although the degree of protection varies.

Planetary Shields in Star Wars

A planetary shield in Star Wars is a roughly-spherical shape that encompasses an entire planet, protecting it from orbital bombardment. Several references to planetary shielding technology and its effects are made throughout the Star Wars film-canon.

Star Wars IV: A New Hope

Alderaanshield.gif

In perhaps the most spectacular demonstration of a planetary shield's power, the destruction of the planet Alderaan shows the 'breaking point' of a core-world's planetary shield. The Death Star I fires its planet destroying superlaser at Alderaan, a beam with a calculated energy of 1E38 J. This energy beam strikes the planetary shield, but the planet does not begin to sustain damage for another tenth of a second. This may mean that, before giving out, the shield was able to dissipate 1E37 J of energy. However, Star Wars turbolasers seem to have a visible "tracer" component, as well as an invisible portion. Since a second explosion is visible during the destruction, it is likely that the invisible portion struck later. This will make the actual amount of energy absorbed lower. It certainly doesn't seem likely that the Empire designed their ultimate weapon with only 900% overkill against existing civilian targets.

Star Wars V: The Empire Strikes Back

In Star Wars V, the Rebel Alliance is able to utilize a "theatre shield" to protect their base on Hoth from orbital bombardment. The shield was strong enough to resist fire from several Imperial Star Destroyers and a Super Star Destroyer for long enough to make a surface assault that could slip under the shield necessary, leading to the Battle of Hoth.

Star Wars VI: Return of the Jedi

This establishes the range of the shield-net itself. A planetary shield generator is employed on the sanctuary moon of Endor, prior to the Battle of Endor. The shield not only extends to the upper atmosphere of the moon, but all the way out into space to entirely encompass the Death Star II as well. Aboard Home One, during the briefing given to the pilots prior to the attack on the Death Star II, a holographic projection of the shield indicates that it does indeed reach out in a conical structure to surround the orbiting Death Star. The full extent of the shield is evident from the fact that the shield needs to be dropped in order for a shuttle to land on the moon, not just to approach the Death Star.

Further, in the novelization, it is shown that when a ship crashes into this planetary shield the collision destroys the ship.

Rogue One

Rogue One removes all doubt that planetary shields exist in the Star Wars setting. The planet Scarif is surrounded by a planetary shield, and finding a way to circumvent it is a critical plot point. The shield blocks energy and objects (such as starships) as well as placing restrictions on communications through the shield.

One glaring flaw, however, is a gate in the shield that allows ships to reach the planet without shutting down the entire shield. The gateway mechanism is not fully enclosed by the shield, making it vulnerable to attack. Should the gateway be destroyed, a large opening is left in the shield instead of it closing completely.

Planetary Shields in Star Trek

Planetary shields are occasionally mentioned in Star Trek but generally are not powerful enough to protect an entire planet from a major attack.

  • The planet Elba II had a planetary shield that blocked transporter function and could withstand phaser fire from at least one Constitution-class starship, but it's not clear whether the shield could have withstood a determined attack.[1] Commander Scott, commanding in the absence of the captain and first officer, was concerned about damaging the Elba II asylum, which was a sealed habitat in a toxic environment. Consequently, his efforts at penetrating the shield were restrained by the need to avoid rupturing the asylum. Nonetheless, the Enterprise did try to penetrate the shield using the starship's main phaser banks on full power, attacking a point on the far side of the planet from the asylum where the shield would be weakest, and the attempt failed. Phaser attacks against surface targets have been sustained for substantially longer, though.[2]
  • The Federation penal colony on the planet Tantalus V was protected by a force field that blocked transporter function, but no attempt was made to defeat the field with starship weaponry.[3]
  • The Federation science outpost on Calder II had a deflector shield to protect it and the archeological ruins being studied there, but there was no indication that this shield protected the entire planet. Disruptor fire from a single mercenary starship was capable of defeating the shield (an effort made easier with trickery known to a Federation starship captain). [4]
  • Chakotay told Annorax that if Captain Janeway had given other ships temporal shielding technology, they would have shared it with their home worlds, which would be able to protect their planets from the Krenim time ship's temporal weapon. This exchange suggests that such civilizations may have had the ability to shield entire planets. However it should be noted that temporal shields are essentially the normal shields and deflector on Voyager modified by Seven of Nine and Lt. Tuvok to the frequency and inverse pulse of the Krenim's chroniton torpedoes. Once the frequency modification was in place, they provided protection against the otherwise conventional warheads onboard the torpedoes. Consequently, a defensive fleet of starships with appropriate shielding may well have been sufficient to keep the Krenim at bay.[5]
  • In the 2150's, the Klingon outpost and colony of Qu'vat had a defensive shield that could withstand a prolonged bombardment from a D-5 battlecruiser's main disruptors. There was, however, no indication that the shield protected the entire planet, and an NX-class starship was also able to withstand fire from the cruiser's weapons (albeit for a much shorter period of time).[6]
  • The planet Aldea had a planetary shield that could block transport and cloak the planet, but it was never tested against weaponry. Furthermore, the planetary cloaking shield was an advanced alien technology that the Federation has not successfully reproduced.[7]
  • In the Delta Quadrant, the Federation starship USS Voyager encountered the Kraylor, whose homeworld had a planetary shield grid capable of resisting energy weapons and preventing ships from physically reaching the surface.[8]

Notes

  1. TOS "Whom Gods Destroy"
  2. TOS "Who Mourns for Adonais?"
  3. TOS "Dagger of the Mind"
  4. TNG "Gambit, Part I", "Gambit, Part II"
  5. VOY "Year of Hell, part II"
  6. ENT "Divergence"
  7. TNG "When the Bough Breaks"
  8. VOY "Nightingale"