Atlantis

"Atlantis is all that remains of the greatest race ever to inhabit the stars."

- Halling

Atlantis, also called the Lost City of the Ancients and the City of the Ancestors, Atlantus in Ancient, is a City-ship built by the Ancients several million years ago, which has approximately the same internal space as found in Manhattan. The Ancients left the Milky Way galaxy several million years ago for the Pegasus galaxy, taking Atlantis with them and settling on a planet they named Lantea, which became their new capital.

Millions of years later, after the Lanteans, the name the Ancients came to be known by submerged the city to protect it from their enemies, the Wraith, and returned to Earth through the Stargate. Their story, over time, inspired the Tau'ri myth of Atlantis.

Ancient use
"We know the Ancients on Earth were suffering from a plague. Uh, maybe some of them were trying to start over, seeding life in a new galaxy."

- Daniel Jackson

Atlantis was built 30 million years ago on Earth on the island later known as Santorini. (SG1: "Transitions")

The city was later moved to the continent of Antarctica, which at the time was situated much closer to the planet's equator. When a Plague similar to the one created by the Ori spread through the Milky Way galaxy, Atlantis was launched from its home, bound for the Pegasus galaxy. A small outpost and a few Ancient individuals were left behind on Earth (most likely because they had the Plague). Another Ancient called Amara remained on Santorini in a stasis pod when the rest of her people left Earth in Atlantis. Atlantis was relocated to the planet Lantea. Once there the Ancients created a new Stargate Network and seeded the galaxy with life, just like they had once done in the Milky Way. Soon life began to flourish where once there was none. (SG1: "Transitions")

Sometime later, during the war with the Wraith, several Wraith Hive ships destroyed all Ancient colonies until Atlantis was all that was left. Hive ships went to Atlantis and started the First siege of Atlantis. The Ancients managed to defeat the Wraith ships every time they came, but were impossibly outnumbered, so the Ancient Council decided to sink the city underwater for protection from weapons fire. Atlantis was attached to the ocean floor with a series of intricate clamps, the city shield holding back the ocean. Towards the end of the war with the Wraith, the Ancient Janus rescued Dr. Elizabeth Weir from a Puddle Jumper which had been shot down by the Wraith. This Jumper was a time machine, designed and build by Janus himself. It had accidentally transported Weir, Major John Sheppard and Dr. Radek Zelenka back in time as they had been forced to flee Atlantis, only hours after arriving there due to the fact that Atlantis had begun to sink due to its failsafes no longer working which had cost the original members of the expedition their lives. Sheppard, Zelenka and Weir later found a Puddle Jumper and escaped but at the cost of Dr. Rodney McKay who stayed behind to give them enough time before McKay drowned in the flooded Control Room seconds later. As such, they all went back in time. Unfortunately, the Jumper was spotted by the Wraith and shot down, triggering a crash that killed both Sheppard and Zelenka while leaving Weir as the solo survivor. Janus found Weir amid the wreckage and brought her back to Atlantis. During this time it was decided, by the Council, to abandon the city and return to Earth via the Stargate.

Unknown to the council however, Dr. Weir secretly stayed behind in stasis as part of a plan devised by Janus. She rotated the city's Zero Point Modules every 3.3 thousand years so that when her expedition team or rather the second expedition team from the current timeline rediscovered Atlantis in 10 000 years's time, the shield would hopefully have enough power to continue to hold back the ocean so they wouldn't drown like they had in her timeline. Janus also programmed a fail safe mechanism into the city so that if power reached a critical level, the clamps holding the city to the ocean floor would release, and Atlantis would rise to the surface once more. Furthermore, the Stargate was programmed to accept incoming wormholes from only Earth so that the city, and Dr. Weir, would remain safe until its rediscovery by the Atlantis Expedition.

Under the Expedition
"They may reside here, Teyla, but they are not the Ancestors... No matter how much you wish them to be."

- Halling

When the Atlantis expedition arrived in July 2004, they started to explore the city until Dr. Rodney McKay discovered that the city's Zero Point Modules were nearly depleted and that Atlantis' shield would fail, causing a massive flood. After searching Athos for safe refuge due to the inevitable shield failure, the search team eventually brought the Athosians back after a Wraith culling occurred. When the team and refugees returned, Janus's failsafe mechanism activated and Atlantis rose to the surface just as the shield finally ran out of power and failed. With Atlantis safe from the risk of flooding, the expedition continued to settle down and set up home for both themselves and the Athosian refugees.

Having learned of the existence of Earth, the Wraith sent three Hive ships to attack Atlantis. The Atlantis expedition was able to destroy the three ships, but the Wraith sent another twelve. Seeing no way of destroying them, the expedition used a cloak adapted from a Puddle Jumper, and timed a Nuclear warhead to make it appear that the city had been destroyed. The Wraith fell for the ruse, causing them to fall into Civil War. The secret of Atlantis surviving is now a top priority for the expedition members.

In 2006, SG-1&mdash;except for Teal'c&mdash;arrived in Atlantis on the Odyssey as a step in their war against the Ori. Lt. Colonel Samantha Carter and Lt. Colonel Cameron Mitchell took Dr. Rodney McKay on a mission to connect a Stargate to the Supergate back in the Milky Way, preventing its further use by the Ori. Meanwhile, Dr. Daniel Jackson and Vala Mal Doran accessed the Atlantis database in the hope of discovering the location of the Sangraal, a weapon against the Ori designed by Merlin. However, the ascended Lantean Morgan Le Fay, who masqueraded as the database's holographic interface, was stopped by the Others before she could reveal it.

Later in the same year, living Lanteans were discovered in the void between Pegasus and the Milky Way, who subsequently reclaimed the city and forced the expedition out. Shortly afterward, the Asurans attacked the city, killing the Lanteans and taking Major General Jack O'Neill and Richard Woolsey hostage. Lt. Colonel John Sheppard, Dr. Elizabeth Weir, Dr. Rodney McKay, Dr. Carson Beckett, Teyla Emmagan, and Ronon Dex launched a daring rescue mission, using the city's shield generators to emit a massive Anti-Replicator gun wave. The expedition was then able to reclaim Atlantis, keeping one of the Zero Point Modules installed by the Asurans and sending the other two back to Earth to help with the battle against the Ori.

In 2007, after a massive pre-emptive strike on Asuras by Earth's new battlecruiser, the Apollo, the Asurans launched a retaliatory attack on Atlantis. They sent a satellite housing a Stargate to Lantea, and after dialing in from Asuras, directed a powerful energy beam at Atlantis. Unable to evacuate by Stargate, and unable to fully dissipate the beam after submerging the city, the expedition used the Stardrive to leave Lantea. The recently discovered mobile drilling platform, located on the ocean floor gave Atlantis the power boost it needed to lift off, as the expedition only had one Zero Point Module instead of the 3 which the city was designed to use. The shield had to be lowered so that more power could be diverted to the Stardrive for the crucial first few moments of flight. As the shield was being raised after this initial phase however the Asurans beam grazed the side of the main tower, causing serious damage to the power conduits. Because of this Atlantis dropped out of hyperspace prematurely and far from the new intended homeworld, with the city's single Zero Point Module nearly depleted, having only twenty four hours of energy left. With the aid of a replacement ZPM, stolen in a daring raid on Asuras, the city eventually settled on M35-117.

During the same year, the nine chevron address in the Atlantis database was discovered, and the Icarus Base was built in the Milky Way to research into dialing it. This later mounted, with the help of Eli Wallace, in the successful dialing of the Destiny days after Atlantis' return to Earth.

In 2008, the hybrid Michael Kenmore used a Puddle Jumper, in conjunction with a stolen IDC and a number of hybrids to infiltrate Atlantis. He combined Wraith and Ancient technology, and managed to create a force field with similar results as a Wraith stunner, disabling anyone who attempted to access the control tower. His goal was to capture Teyla Emmagan's son, Torren John Emmagan. Ronon Dex eventually escaped from his original capture, as he was in Stargate Operations when the stun field was established. However Michael was able to overpower and render Ronon unconscious. This distraction allowed Teyla to escape. Michael activated Atlantis' self-destruct in an attempt to draw Teyla out, but was unsuccessful. He then attempted to retreat with the DNA of Teyla's son that he had already taken vowing to clone him. In the meantime, Dr. Rodney McKay and Lt. Colonel John Sheppard planned to use a Puddle Jumper from the underwater Jumper bay, dial the Dial Home Device and to use the unstable vortex to destroy Michael's Jumper, thus rendering the stun field inactive and restoring Atlantis to its natural power. The plan succeeded and Michael was forced to flee with Sheppard in chase. As they battled on the outside of one of Atlantis' towers, Michael was about to throw Sheppard over the side, but Teyla intervened and pushed Michael over the edge. His grip failing, Teyla kicked his hand from the ledge, finally killing him in the fall.

Return to Earth
"Walter, you'd better get me the President. It looks like Atlantis is coming home."

- Samantha Carter

Early in 2009, the Wraith Todd contacted Atlantis and told them that his underling had mutinied and managed to use several Zero Point Modules, acquired during the destruction of Asuras, to create a Super-hive. He urged the expedition to attack it before it becomes a major threat to them. The Tau'ri sent the Daedalus to confront the Hive ship, but the ZPM-powered vessel proved itself an impressive opponent, crippling the Daedalus before making a sudden and inexplicable jump into hyperspace. The expedition later found out that the Hive ship was on its way to Earth.

Both the Apollo and the new Tau'ri spaceship, the Sun Tzu, failed to destroy the vessel before it reached Earth. Sheppard interrogated Todd for the location of more ZPMs, which Major Evan Lorne and his team were able to locate; Atlantis, now with her full complement of three ZPMs, was sent to its original home in a last-ditch effort to defend it. Dr. Carson Beckett flew the city until the city's hyperdrive failed at the edge of the Milky Way. Dr. Radek Zelenka proposed activating a highly experimental and potentially dangerous drive based on the same wormhole technology as the Stargate. With it, they could potentially reach Earth in seconds.

When Atlantis arrived, it placed itself between the Super-hive and Earth in order to buy Stargate Command more time. Atlantis took the brunt of the Hive ship's assault and launched a barrage of drone weapons in retaliation. The sheer force of the Hive ship's weapons fire pushed the City-ship into Earth's atmosphere, placing severe strain on the shield. Quickly losing power, the only options were to either adjust Atlantis' course or keep firing at the enemy ship; Richard Woolsey chose to keep firing. The SGC eventually succeeded in destroying the Hive ship, but Atlantis was now forced to land on Earth, risking burning up during re-entry.

Everyone at Stargate Command waited for news with bated breath, but erupted into celebration when Atlantis lands successfully over water. The city was able to cloak just before their approach to San Francisco Bay, and the area in which they landed was placed under naval quarantine to prevent ships from passing through the cloaking field.

After arriving on Earth, repairs to the city began. It was quickly determined that the wormhole drive couldn't be fixed but that the hyperdrive was repairable with several weeks of work. However, the IOA refused to let Atlantis off of Earth at first, pushing the President to give them full control of Atlantis as a sovereign state. With the Ancient technology and drone weapons possessed by Atlantis, anyone who had control of it could demand anything of other countries and they'd be forced to comply. If the IOA gained full control, they'd effectively become the first world government. Due to the economic crisis, the President was also unable to supply Atlantis with a full military contingent if it went back to the Pegasus Galaxy. Finally, the President reached a deal with Woolsey: if Woolsey could find a way to get the IOA to agree to let Atlantis leave, the President would allow him to have a small team of military advisors to aid in protecting Pegasus. After the IOA started to shut down the Atlantis Expedition with plans to dismantle the city, Woolsey, General Jack O'Neill and Colonel Samantha Carter began conspiring to get Atlantis back to Pegasus. As the head of Homeworld Security, O'Neill officially took command of Atlantis as it fell in American territorial waters while anyone wanting to transfer, was transferred to the George Hammond under the command of Carter. While in control of the city, O'Neill used his command of it to secretly restock the city and have repairs done to vital systems such as the hyperdrive using "half the Air Force", Doctor Bill Lee and his team and the SGC's entire maintenance section. O'Neill was able to restore Atlantis' personnel to around four hundred with about one hundred of these being new Air Force personnel sent to replace civilian contractors Woolsey didn't have time to replace. Eventually, rather than allow the American military to have full control of Atlantis, the IOA agreed to allow it to return to Pegasus at which time O'Neill restored command to Woolsey. Carter also allowed those who transferred to the George Hammond and wished to transfer back to do so. With Sheppard and Beckett alternating piloting, Atlantis took off on a nine day journey for Lantea followed close behind by the Daedalus which saw the city off from a lower orbit along with the George Hammond.

Unknown to the city inhabitants until some time later, at least one flock of pigeons had settled in the city while it was on Earth and were trapped when the shield was raised before takeoff. As a result, unknown to everyone at the time, the pigeons were carried with Atlantis to the Pegasus Galaxy.

Return to Pegasus
Five days into the journey, Dr. Carson Beckett noticed a "wobble" while piloting the city. Lieutenant Colonel John Sheppard determined it was a problem with the number four hyperdrive induction array which was damaged in the battle with the super-hive and had been giving them trouble repairing. Doctors McKay and Zelenka noticed a slight power variance, but decided to just keep an eye on it. Almost seven days into their journey, the damaged induction array malfunctioned and began drawing power from all systems to expand the hyperspace envelope. Doctor Miko Kusanagi was able to divert priority power to the shield so they didn't lose that, but Zelenka had Beckett drop them out of hyperspace as they couldn't get ahead of the power variance. While they were able to regain control of the city's systems and determine the source of the problem, the malfunction drained the ZPMs to 20% power while frying the induction array's command crystal which they could not replace. Atlantis was left stranded on the fringe of the Pegasus galaxy as a result with the Daedalus at least thirteen days away and no guarantee of a habitable planet nearby. Zelenka was eventually able to locate a marginally habitable planet within five days sublight range and Atlantis headed for it. Sheppard eventually managed to land Atlantis on the planet eighteen degrees north of the equator, a habitable location, but barely at negative eight degrees centigrade when they landed. As the planet had never had a Stargate, they had to invent one for the planet while the city began reshaping itself in places to adapt to the much colder climate. The hyperdrive malfunction and landing also left them with only 9% power in the ZPMs and Sheppard landed the city at a crooked angle to its previous positions.

Following the landing, the city began experiencing problems with its short-range sensors due to them being iced over which were eventually cleared by maintenance teams once the source of the problem was determined. At the same time, Atlantis began having to deal with chunks of ice hitting the city. While studying the problem, Zelenka found the city's ice defenses, but discovered that they wouldn't deploy as the underwater sensors were damaged and thus the city was unaware it needed to deploy them. A team led by Major Evan Lorne was able to replace the damaged sensors and Atlantis' ice defenses were properly deployed. At the same time, while investigating a series of small life-signs readings in one of the Atlantis towers, Lorne and a team of Marines discovered a flock of pigeons that had made their home on Atlantis while the city was landed on Earth and had accidentally been brought along for the ride. Despite the expedition's biologists worrying about what effects introducing the pigeons to the ecosystem of the frozen planet could have, it was decided to leave the pigeons alone as it could cause more harm than good to try to get rid of them. Thus, the city gained a flock of pigeons as part of its population.

After Doctor Rodney McKay was captured and turned into a Wraith, the Wraith were able to penetrate Atlantis and steal the ZPM. They later sent incursions through the Stargate due to McKay's ability to penetrate the city's Gate shield before a metal iris like the one on the Earth Gate was installed. Eventually a partially-charged ZPM was recovered on Sateda and another one was found on a planet the Wraith had used as a safe haven thousands of years before, restoring the city to full power. Doctors Radek Zelenka and William Lynn also found a new hyperdrive induction array control crystal in the Satedan military museum, restoring Atlantis' hyperdrive to working order.

After the rescue of McKay, Queen Death decided to launch an attack on Atlantis. Warned ahead of time by the Genii, the Expedition decided to defend the city rather than destroy it or flee into hyperspace. In the battle that followed, Atlantis itself was launched into orbit to act as both a weapons platform and a base of operations for the battle. Piloted mainly by Sheppard and commanded by Jack O'Neill, Atlantis, the George Hammond, the Pride of the Genii, and eventually a small Wraith fleet led by Guide engaged the Wraith. With precision aiming, Atlantis' drones were able to severely damage two hive ships and destroy another one. During the battle, the East Pier maneuvering engine took damage and went down and the threat of a Wraith cruiser rigged as a fire ship kept immediate repairs from being performed. After Queen Death was killed, the remaining Wraith forces surrendered and Sheppard determined that Atlantis, which had not lost significant shield power despite the constant attack the city had been under, could still land even without the East Pier engine. With more power to work with, Sheppard was able to land Atlantis closer to the equator and in a much smoother way than the city's previous landings.

Technology
Atlantis has a great deal of advanced technology in it, ranging from the Stargate and Puddle Jumpers, to drone weapons, the Stardrive, and a shield.

Energy
Atlantis's main energy supply are Zero Point Modules, which are stored in a special room. To gain access to all of the technology and features of Atlantis, three are needed, however in cases of emergency, one can perform the most important tasks. The city also possesses several solar-powered generators, however they don't provide much energy in proportion to the massive amounts required to operate any useful technology in the city. In one extreme instance, lightning strikes from a massive storm were used to briefly power the shield in order to save it from a tsunami. A more effective method of alternatively powering Atlantis comes in the form of a geological drilling station located on the sea floor of Lantea. This station was built by the Ancients and utilized by the Atlantis expedition when they left Lantea.

Shield
The shield of Atlantis is a massive dome that completely encompassed the city when activated. It protects the city from anything ranging from orbital bombardment, to the weight of an entire ocean, to a tsunami, to coronal mass ejections, to falling space debris. The shield can cover the city like a skin to prevent the ocean from crashing inside when the city is submerged, or to prevent air evacuation when traveling through space. Also, the shield can be expanded when necessary to protect nearly an entire planet, or contracted to save power. After some modifications made by Dr. Rodney McKay, the shield can also be used to cloak the city. Atlantis' shield, even powered by two ZPMs, one of which was only partially charged, proved capable of taking tremendous strain during the Second Battle of Atlantis. Despite holding back the vacuum of space and Wraith attacks, the city's shield only dropped as far as sixty percent after a heavy hit, but quickly recharged back up to eighty-nine percent. By the end of the battle, despite facing five hive ships and several Wraith cruisers, the shields had only dropped to seventy percent.

Stardrive

 * See also: Hyperdrive &sect; Ancient

The Stardrive on Atlantis enables the city to travel to distant planets, or even galaxies, in only a few days and is incredibly powerful. It is designed to operate with 3 Zero Point Modules, but can be powered by 1 if the situation calls for it, and if other power sources are used as well, the mobile drilling platform for example. The most power is used in getting Atlantis off the surface, after this a single ZPM is able to power the city and open a hyperspace window. The hyperdrive was rendered permanently inoperable when an overload during the return to Pegasus burned out one of its induction array control crystals, but a replacement was eventually found in the Satedan military museum.

Stargate
Atlantis' Stargate transports people and objects to other worlds. It also features a force field that prevents even subatomic particles from rematerializing, similar in function to the iris protecting Earth's Stargate, only much more effective and seemingly impossible to breach. Also, unlike every other Stargate in the Pegasus Galaxy the Atlantis Gate is able to dial another galaxy due to a special crystal in its DHD. Atlantis' original Stargate was recently destroyed due to the use of the Attero device, which had the side-effect of destroying active Stargates. The destroyed gate was later replaced with a Stargate from the former intergalactic gate bridge network and retains both the ability to dial an intergalactic address and the ability to activate its shield, as they are not functions of the Stargate itself. After Rodney McKay was captured by the Wraith, a metal iris was added like the one on the Earth Stargate to further protect from incursions.

Wormhole drive
The Wormhole drive is an experimental drive that was designed by the Ancients but was abandoned due to how dangerous and unstable it was as well as the immense power requirements. The Atlantis expedition used this drive to reach Earth in mere seconds after its hyperdrive failed at the edge of the Milky Way. However, this single trip burned out the wormhole drive and it was beyond the Tau'ri's ability to repair as it had parts they didn't even have names for, let alone know how to replace.

Cold Protection Systems
In the event of landing on a planet with a much colder temperature than Lantea, Atlantis has systems to protect itself. Upon the sensors detecting the harsher environment, parts of the city will reshape themselves to offer better protection to its inhabitants. If enough ice is detected in the water, Atlantis will deploy a series of spikes and cables underwater to form a sort of fence protecting the more delicate components on the underside of Atlantis from chunks of ice without the need to deploy the shield. This was presumably a low-tech defense mechanism installed to protect the city while it was in Antarctica. However, these underwater defenses will not deploy if the underwater sensors are damaged, preventing Atlantis from detecting the need to deploy them.

In 2009, after landing on the frozen planet, this subroutine automatically activated and the city made noticeable changes to its walkways and parts of its structure to better shield its inhabitants from the snow and cold of the planet. However, the underwater sensors had been damaged, possibly from when the city had been moved to New Lantea years before, the Battle of the Super-hive or ice after landing and the underwater defenses did not deploy. After this part of the city's defenses were figured out by Doctor Radek Zelenka and Major Evan Lorne, a team led by Lorne replaced the damaged sensors at which point the city automatically deployed its underwater ice defenses.

Areas

 * Control tower
 * Inner CityVlcsnap-2012-07-23-04h01m10s186.png
 * East Pier
 * North Pier
 * South Pier
 * South-East Pier
 * South-West Pier
 * West Pier

Locations

 * ArchivesAtlantis map.jpg
 * Armory
 * Ascension lab
 * Ascension Research Lab
 * Auxiliary control center
 * Bio lab
 * Botany Lab
 * Plant Room
 * Brig
 * Caldwell's Office
 * Cargo hold
 * Chair room
 * Commander's office
 * Containment chamber room
 * Conference room
 * Dr. Heightmeyer's Office
 * Drone weapon storage room
 * Vlcsnap-2013-08-01-00h05m15s212.png weapon deployment platform
 * Grounding stations 1-4
 * Gym
 * Hangar
 * HAZMAT storage
 * Holo room
 * Infirmary
 * Isolation room
 * Janus' lab
 * Jumper bay
 * Living quarters
 * Crew Quarters Atrium
 * Main power room
 * Mess hall
 * Nanite lab
 * Plaza
 * Power distribution center
 * Reading Room
 * Section Seven
 * Society research lab
 * Stargate Operations
 * Stasis Chamber Room
 * ZPM room

Technologies

 * Database
 * DNA resequencerVlcsnap-2013-08-01-00h14m48s49.png
 * Desalination Tanks
 * Control console
 * Drone weapons
 * Failsafe mechanism
 * Grounding stations
 * Inertial dampeners
 * Lockout device
 * Lightning rods
 * Main Power Conduits
 * Medical Scanner
 * Sensors
 * Biological sensors
 * Internal/external biometric sensor array
 * Long range sensors
 * Underwater sensors
 * Life support
 * Shield
 * Stardrive
 * Stargate
 * Stasis chamber
 * Subspace trasmitter
 * Transporters
 * Wormhole drive

Connected Technology

 * Mobile drilling platform

Commanding officers

 * Moros (Unknown-c.8,000 B.C.)
 * Dr. Elizabeth Weir (2004-2007)
 * Colonel Steven Caldwell (briefly) (2006)
 * Helia (2007)
 * Dr. Elizabeth Weir (2007)
 * Lt. Colonel John Sheppard (briefly) (2007)
 * Colonel Samantha Carter (2007-2008)
 * Lt. Colonel John Sheppard (briefly) (2008)
 * Richard Woolsey (2008-2009)
 * Lt. General Jack O'Neill (briefly, twice) (2009)
 * Richard Woolsey (2009-present)

Alternate realities

 * In an alternate reality to which Lt. Colonel Samantha Carter was accidentally transported in 2007, Atlantis was never discovered by the Tau'ri. Consequently, the Wraith did not awake from their hibernation in 2004.

Alternate timelines

 * In an alternate timeline, Atlantis had no failsafe mechanism and all Zero Point Modules ran simultaneously so the city sank when it was flooded. Consequently, almost the entire Atlantis expedition was killed shortly after their arrival in the Pegasus galaxy. Dr. Elizabeth Weir, Major John Sheppard and Dr. Radek Zelenka got into a time-traveling Puddle Jumper, going back ten thousand years. After being attacked by two Wraith Darts, the Jumper crashed and Weir was the only survivor. The Ancients of the time refused to let her go back to her future since it would corrupt the timeline. Luckily, the time-machine's inventor, Janus, helped her by creating a failsafe and making sure the ZPMs ran the city one at a time to save some extra power.
 * In another alternate timeline, forty-eight thousand years into the future, M35-117 was a desert planet and its star is getting hotter. Atlantis was abandoned by humans all together. Lt. Colonel John Sheppard, accidentally there, wanted to go back to his time. Guided by a hologram of Dr. Rodney McKay, he tried to get to the stasis chamber to wait for a solar flare that would not happen before seven hundred more years. However, due to the aging sun, in five hundred years the planet would become uninhabitable. Sheppard used the city's solar panels to power the shield to protect the atmosphere.