Celestial body

Version

This article is considered accurate for the current version (2.2) of the game.

A trinary star system

A celestial body is a star, planet, moon or asteroid present in a star system. Celestial bodies may have resources which can be harvested by orbital stations. Each start system can have between 2 and 15 celestial bodies.

When any owned ship enters a system or passes within its sensor range, any habitable planets in the system will be revealed along with their world type. To see further details about the celestial bodies in a system, it is necessary to survey them with a science ship. This will reveal all of the orbital resources associated with each planet or asteroid. For habitable worlds this will also reveal more detailed world information including: size, surface tiles and their resources, and the habitability percentage for each species in the player's empire. Additionally, surveying worlds has a chance to reveal anomalies.

Summary of celestial body types

Habitable worlds

A habitable world is any celestial body that can harbor advanced organic life. These are the only worlds that can be colonized and terraformed, besides some notable exceptions. Their suitability ranges in accordance to a given species' homeworld, which affects the rate of population growth.

A planet's habitability (and subsequent future terraforming costs) is determined by its climate system. The 9 habitable worlds are divided equally into 3 climate categories: dry, frozen and wet.

	Type	Climate	Description
	Arid	Dry	Dry, rocky world with a nitrogen-oxygen atmosphere. The dust-covered terrain consists largely of mesas and canyons. Forests can be found in the more temperate polar regions, but vegetation is otherwise scarce.
	Desert	Dry	Dry, rocky world with a nitrogen-oxygen atmosphere. Precipitation and major bodies of surface water are relatively rare. Significant temperature variations between day and night cycles. Vegetation is scarce, but even moderate precipitation can make the desert bloom.
	Savanna	Dry	Rocky world dominated by dry, arid plains covered by a nitrogen-oxygen atmosphere. The small hydrosphere allows for brief wet seasons, but aside from a few ubiquitous grasses vegetation is largely concentrated around shallow oases.
	Alpine	Frozen	Mountainous world with a nitrogen-oxygen atmosphere. Snow covers the mountaintops and frozen-over lakes dot the valleys. While the planet experiences the minimal seasonal variations, the still-liquid water beneath the frozen surface of the lakes is enough to sustain some hardy vegetation.
	Arctic	Frozen	Frigid, rocky world with a nitrogen-oxygen atmosphere. The poles are big, and significant water deposits can be found permanently frozen as glacial ice. However, the planet experiences seasonal variations and the equatorial band is covered by vegetation.
	Tundra	Frozen	Cold and rocky world with a nitrogen-oxygen atmosphere. Permafrost covers most of the surface except for the more temperate equatorial regions. A stable biosphere exists but vegetation is mostly limited to mosses and lichens.
	Continental	Wet	Rocky world with a nitrogen-oxygen atmosphere. Active and stable hydrosphere. Great landmasses are separated by oceans, with large climate variations depending on latitude and precipitation.
	Ocean	Wet	Rocky world with a nitrogen-oxygen atmosphere and a significant hydrosphere. Oceans cover more than 90% of the surface, with scattered islands making up the remaining percentage.
	Tropical	Wet	Humid, rocky world with a thick nitrogen-oxygen atmosphere. Seasons with significant precipitation are interchanged with drier periods. Most landmasses are covered in dense vegetation.

Special habitable worlds

	Type	Terraforming requirements	Pop effects	Notes
	Gaia	World Shaper ascension perk	100% Habitability +5% Biological Pop Happiness +10% Resources from Jobs	The number of pre-generated Gaia worlds is limited. The home systems of three of the Fallen Empires contain Gaia worlds. A size 25 Gaia world called Zannam will occasionally spawn in a galaxy. It is defended by the Guardians of Zanaam. Four Gaia worlds with special names - Prophets Retreat, Walled Garden, Emerald Mausoleum, Pristine Jewel - border the systems of the Holy Guardians. They have the Holy World modifier and colonizing them will incur their ire. Destroying them will even awaken the Fallen Empire. Empires with the Life-Seeded civic will start on a Size 25 Gaia world. Their species' climate preference will also be changed to Gaia World. A Gaia world is located in the Sealed Wormhole system and requires defeating the Corrupted Avatar to claim the system. One of the outcomes of the Stellarite Devourer event chain will turn a frozen planet in its home system into a Gaia world. A system containing a size 25 Gaia world called Paridayda can be spawned as part of the Paradise Lost event. It has no natural resources but comes with a unique planet modifier granting various bonuses. A Gaia can be found in a special binary system. Every 3 months it changes between Gaia and Shrouded but claiming the system will allow the creation of a Special Project to permanently set the planet to a Gaia world.
	Tomb	Armageddon bombardment	0% Habitability	Tomb Worlds are habitable but feature the poorest base habitability and very few Planetary Features. Also, a species cannot be gene-modified to suit a Tomb World. Pre-FTL civilizations in the Atomic or Early Space Age have a small chance of starting a nuclear war and turning the planet into a Tomb World. Empires with the Post-Apocalyptic civic start on a Tomb World and get the Survivor trait, granting them +70% Tomb World Habitability as well as +10 Years Leader Lifespan. Empires with the Determined Exterminator civic start on a Tomb World as well. Colonizing a Tomb World will displease the Traditionalist faction, unless the empire has the Post-Apocalyptic civic.
	Hive	Hive Worlds ascension perk	100% Habitability if Hive-Minded 0% Habitability if not Hive-Minded +10% Resources from Jobs	All normal planetary features are removed. Number of resource districts no longer limited by features. Planetary Prospecting decision disabled.
	Machine	Machine Worlds ascension perk	100% Habitability if Mechanical 0% Habitability if not Mechanical +10% Resources from Jobs	All normal planetary features are removed. Number of resource districts no longer limited by features. Planetary Prospecting decision disabled. Cannot support Agriculture Districts. The following planetary modifiers will also be removed: Atmospheric Aphrodisiac, Atmospheric Hallucinogen, Bleak, Hazardous Weather, Hostile Fauna, Irradiated, Lush, Natural Beauty, and Wild Storms.
	Ecumenopolis	Arcology Project ascension perk	100% Habitability	Ecomenopolis Worlds can be found in the home systems of the Keepers of Knowledge or First League precursors. All normal planetary features are removed. Planetary Prospecting decision disabled. These city planets have their own set of districts that focus on providing massive amounts of Housing and refining basic resources. The city lights of an Ecumenopolis World are determined by the ship appearance of the terraforming empire. Empires that are Gestalt Consciousnesses or have the Agrarian Idyll civic cannot take the ascension perk but can still use conquered Ecumenopolis Worlds.

Uninhabitable celestial bodies

All non-star celestial bodies that cannot harbor advanced organic life are classified as uninhabitable. These worlds can't be colonized or terraformed, but can still be lucrative sources of common and strategic resources.

	Type	Potential Common Resources	Potential Strategic Resources	Description
	Asteroid	Minerals	Volatile Motes	A larger asteroid or planetoid standing out in the dense cluster of smaller bodies.
	Ice Asteroid	Minerals	Rare Crystals	A larger asteroid or planetoid composed primarily of frozen H2O.
	Crystalline Asteroid	Minerals	Volatile Motes?	A large asteroid covered in some kind of crystalline outcroppings.
	Barren World	Minerals Physics Research		Barren and rocky world with a thin or non-existent atmosphere. The surface is covered in meteor impact craters and completely devoid of life. Can be terraformed if terraforming candidate modifier exists
	Barren World (Cold)	Minerals Physics Research		Barren and rocky world with a thin or non-existent atmosphere. The surface is covered in meteor impact craters and completely devoid of life. Can be terraformed if terraforming candidate modifier exists
	Frozen World	Minerals Engineering Research	Rare Crystals	Rocky world covered in a thick layer of permanently frozen ice. Low temperatures and a very thin atmosphere precludes the existence of life on the surface.
	Gas Giant	Energy Engineering Research	Exotic Gases Zro	Gaseous planet with an atmosphere primarily composed of hydrogen and helium surrounding a dense core.
	Molten World	Energy Minerals Engineering Research	Volatile Motes	Rocky world that is scorching hot. The atmosphere is thin or non-existent, and lava from the interior flows freely due to constant volcanic eruptions. This type of planet cannot sustain organic life.
	Toxic World	Minerals Society Research	Exotic Gases Zro	A rocky planet with a thick atmosphere that is lethal to all known higher forms of life.

Special worlds

A special world is any celestial body that does not follow the standard rules of procedural generation and are, in many cases, only created by events.

	Type	Notes	Description
	AI	These planets are created by the Contingency. They are similar in appearance to Machine worlds, but are not habitable at all. Successful bombardment turns the planet into a broken world.	Rocky world covered with artificial structures. The thin atmosphere consists mostly of industrial pollutants. There are strong energy emissions coming from across the entire surface, but no organic life signs.
	Broken	Rare planets that are as useless as they are broken.	World devastated by some cataclysmic event. Whatever properties it may once have had are no longer discernible.
	Cracked	Created by the hatching of the Voidspawn, destroying the existing colony. Has a deposit of 20 Society.	The cracked shards of an enormous planet-sized egg.
	Infested	Created when habitable worlds are infested by the Prethoryn Swarm. Successful bombardment turns the planet into a barren world that can be terraformed.	The surface of this world is covered by some kind of biological contaminant.
	Nanite	Found in the L-Cluster, with half of the outcomes giving them the Terraforming Candidate modifier once the nanite factory is destroyed.	A chaotic and inhospitable world, disfigured according to some mad design.
	Shattered	Created when a planet is destroyed with a World Cracker. The Shattered world will get a deposit of between 4 and 16 Minerals.	The charred, broken remnants of what was once a planet. A massive energy surge has detonated this world's core, leaving only slabs of rock.
	Shielded	Found inside Militant Isolationists Fallen Empire territory. The shield can be brought down through a special project, with different possible outcomes (mothballed fallen empire ships, a captive admiral or a group of Void Clouds). They can also be created using the Global Pacifier Colossus weapon, but these worlds cannot then be un-shielded.	This entire world is encased in some kind of impenetrable energy barrier. It blocks all scans of the surface.
	Shrouded	Created by the End of the Cycle or when the Eater of Worlds is ravenous. Cannot be recovered. A few shrouded world can be found in some special systems.	Our sensors are unable to penetrate the thick fog surrounding the planet. Ships that enter it do not return.

Habitable Megastructures

Habitable Megastructures are entirely artificial and feature 100% habitability for every species and have no colonization cost as long as they are within borders.

Type	Size	Notes	Description
Habitat	6 without Master Builders 8 with Master Builders	Requires the Voidborn ascension perk Uses a unique set of Districts that provides more specialized jobs but cannot produce basic resources Uses a unique set of Districts that provides research and tech-drone jobs but cannot produce food and minerals.	An artificial deep-space arcology offering planet-like, if decidedly urban, living conditions. Hydroponics and advanced filtering technologies make it near-self-sustaining, and station-borne facilities can mine the station's host planet for raw materials.
Ring World	50	Ringworlds cannot have Mining Districts Intact Ring Worlds are found only in the the Sanctuary system and the Ancient Caretakers home system. Can be repaired from broken segments with the Mega-Engineering technology Can be built in uninhabited systems after taking the Galactic Wonders ascension perk Segments destroyed by a crisis or World Cracker cannot be repaired	An immense band encircling the system's sun. Built to allow for numerous artificial habitation zones along its inner span, freed from the restrictions and mundanity of planet-bound, spherical existence.

Stars

A star is a celestial body that composes the center of a star system and influences the generation of the solar system. They are classified based on their spectral characteristics. Less common stars also have a negative effect on all ships in the system, making certain tactics less effective in battle.

Most systems have only one star but a few have two or three stars, either orbiting each other with the planets around them or far enough from each other that a few planets orbit each star.

	Type	Potential Resources	Description
	Class B	Energy Physics	The large class B main-sequence stars are very bright and blue. Although somewhat rare, the luminosity of these stars make them among the most visible to the naked eye.
	Class A	Energy Physics	These relatively young white or bluish-white main-sequence stars are typically among the most visible to the naked eye. They are large and rotate very quickly, but will eventually evolve into slower and cooler red giants.
	Class F	Energy Physics	F-type stars are fairly large and often referred to as yellow-white dwarves. Although they often emit significant amounts of UV radiation, their wide habitable zones have a good chance of supporting life-bearing worlds.
	Class G	Energy Physics	Often referred to as yellow dwarves, G-type stars actually range in color from white to slightly yellow. Main-sequence stars fuse hydrogen for roughly 10 billion years before they expand and become red giants. Although their lifespans are shorter than K-type stars, worlds inside the habitable zone of a G star often enjoy optimal conditions for the development of life.
	Class K	Energy Physics	These main-sequence stars, sometimes referred to as orange dwarves, are a fairly common sight. They are stable on the main-sequence for up to 30 billion years, meaning that worlds orbiting a K-type star have a longer than average window to evolve life.
	Class M	Energy Physics	The most common stars in the universe, often referred to as red dwarves. Their low luminosity means they are difficult to observe with the naked eye from afar. Although they typically have an extremely long lifespan, red dwarves emit almost no UV light resulting in unfavorable conditions for most forms of life.
	Class M Red Giant	Energy Physics	With a large radius and comparatively low surface temperature, red giants are stars of moderate mass in a late stage of stellar evolution. Their expanded stellar atmosphere and high luminosity make for distant habitable zone orbits.
	Class T Brown Dwarf	Energy Physics	Brown dwarfs are substellar objects that lack the mass to sustain hydrogen fusion. Roughly the size of large gas giants, they have a much greater density. Their low luminosity and comparatively small heat generation means that planets orbiting them are unlikely to support life.
	Pulsar	Engineering Physics	Pulsars are highly magnetized neutron stars that emit beams of electromagnetic radiation. As the star rotates, the radiation beam is only visible when it is pointing directly at the observer. This results in a very precise interval of pulses, which sometimes is so exact that it can be used to measure the passage of time with extreme accuracy. The radiation emitted by pulsars interferes with deflector technology, rendering ship and station shields inoperable. +100% Shield Nullification
	Black Hole	Engineering Physics Dark Matter	Typically formed as a result of the collapse of a very massive star at the end of its life cycle, black holes have extremely strong gravity fields that prevent anything - including light - from escaping once the event horizon has been crossed. The gravitational waves emitted by black holes interfere with FTL drives, making it harder for ships to escape from combat. +50% Disengagement Chance Reduction +50% Emergency FTL Jump Cooldown Allows starbases to construct the Black Hole Observatory building.
	Neutron Star	Engineering Physics	These incredibly dense stellar remnants are sometimes created when a massive star suffers a rapid collapse and explodes in a supernova. Although their diameter is typically as little as ten kilometers, their mass is many times greater than an average G-type star. The gravitational waves and radiation emitted by Neutron Stars must be carefully navigated around, slowing the sublight speed of ships. +50% Sublight Speed Reduction

Habitability

Habitability is the measure of how well a species can live on a planet. Every species has a climate preference for one of the primary habitable world types. A planet's habitability (and terraforming cost) is determined by its climate. The 9 habitable worlds are divided into 3 climate categories: dry, frozen and wet. Gaia worlds and Megastructures have maximum habitability for all species while Tomb Worlds and Machine Worlds are normally uninhabitable by biological species.

Tier	Base
Gaia, Megastructures and Ecumenopolis	100%
Exact Match	80%
Climate Match	60%
Climate Mismatch	20%
Tomb World and Machine World	0%

Worlds of any type may have features which either increase or decrease their habitability. If present, these features will be identified when the world is surveyed by a science ship.

Habitability Effects

• Every 1% of Habitability under 100% increases the Pop Upkeep and Amenity Usage by 1% and their resource output and happiness by 0.25%. It caps at 0% Habitability, giving +100% Pop Upkeep and Amenity Usage.
• Homeworlds have a +30% habitability for the species originating on them.
• Low Habitability can also trigger events.

Habitability strategy

Terraforming

Terraforming allows the change of the Climate class to be one more suitable for the intended Colonists. However, the process is very costly, requires decades of time and requires special technology if it is not only from a secondary to the primary habitability. This step can now be done retroactively on an already colonised planet, once the relevant tech has been researched. However, during Terraforming, Pops will suffer −20% to their happiness.

Subspecies

Using genetic modification, one can create a subspecies of the empires primary species that is suitable for the Climate in question. However, this needs either the first-in approach (so they can be changed on the new Planet) or a staging area with increased Habitability regardless of current Climate Preference (Ringworld, Habitat, Homeworld, rare modifiers).

Changing a habitability trait now cost the equivalent of adding a trait worth 3 trait-points. The relevant tech must also be researched before the habitability trait can be changed.

Xenos

With all the possible habitability types, there are bound to be some aliens that can live comfortably on planets which are unsuitable to the primary species. The main disadvantage is that xeno pops have increased Unity cost per pop and might not have favorable traits. There may also be unwanted Xenophile attraction/Faction interactions from this path.

Both via Conquest and Migration Treaties, one can add xeno pops to the Empire to use as colonists. If the empire is Xenophobe, the rights limitations for xenos will make the pops also considerably less happy. The migration approach requires a "first-in" colonist.

Genetic Uplifting, Enlightenment and Infiltration can be used to acquire a xeno species as well. With the first one, it might even be possible to get a rare Habitability like Tomb Worlds. Very rare species native to Tomb Worlds are extremely adaptive and can thrive on any kind of planet (every normal class is secondary). The usual way of obtaining these species as subjects is finding them as upliftable semi-sentients on Tomb Worlds and uplifting. The event chain Horizon Signal can also create a subspecies of your main species with this trait. Alternatively, pops of your main species on Tomb Worlds may mutate and develop into their own species native to Tomb Worlds.

Robots

All robots, including the primary species of Machine Intelligence empires, have 100% Habitability on every kind of inhabitable world. However, only drones and synthetics can actually be colonists. Synthetics are good to superior in all tasks, but also increase the Unity costs. Robot pops furthermore have a massive draw towards Materialist ethics, both for themselves and other pops on the planet.

While the initial growth might be slower than a pure biological species, once the pop count is sufficient, Robots will also grow a lot quicker than biological species. Droids or synths make particularly good "first in" colonists, if they can be moved off or Materialist attraction is acceptable.

Visual cues

Systems containing surveyed or non-surveyed habitable worlds will have one or more planet icons that are either green, yellow, orange, red, or blue, depending on the habitability percentage and/or status of the planet(s) in question.

• Green: The world is ≥70% habitable for at least one species in the player's empire.
• Yellow: The world is 40–69% habitable for at least one species in the player's empire.
• Red: The world is <40% habitable for all species in the player's empire.
• Orange: The world is habitable but not surveyed.
• Blue: The world is currently being Terraformed.

Sometimes other factors can prevent colonization of a world. Some common reasons for not being able to colonize an otherwise habitable world are:

• There is an anomaly on the world which has not yet been researched
• The world is inhabited by a pre-FTL civilization

Zooming in to the system and hovering over the planet icon may reveal useful information about what is preventing the player's empire from colonizing the world. e.g. If the tool tip says the world is 'controlled by Unidentified Empire' or 'belongs to someone else', another empire is in control of the system. In this case, surveying the world will reveal the empire that controls it. This action can cause the player's science ship to be missing in action for up to a year, so it may be preferable to avoid surveying the world.

Since different species can have different world type preferences, it can be better for an empire to populate its worlds with other alien species, genetically-engineered subspecies, or even robots/synthetics.

It is also possible to terraform habitable worlds, though this is a costly and time consuming process. Only planets of the main types (continental and such) can be terraformed, in addition to tomb and barren worlds with the "Terraforming Candidate" modifier.

Planetary features

All planets have a random number of Planetary Features, which determine the number of Districts and Strategic Resource extraction buildings a world can support. Certain features are more likely to appear depending on the planet class.

	Agriculture Districts	Generator Districts	Mining Districts	Crystal Mines	Gas Extraction Wells	Mote Harvesting Traps	Betharian Power Plant	Alien Zoo
+1	Boggy Fens Bountiful Plains Fair Tundra Green Hills Lichen Fields Nutritious Mudlands Rugged Woods	Arid Highlands Hot Springs	Mineral Fields Ore-Veined Cliffs	Crystalline Caverns	Bubbling Swamp	Dust Caverns	Betharian Fields	Isolated Valley
+2	Fertile Lands Fungal Caves Great River Lush Jungle	Frozen Gas Lake Rushing Waterfall Searing Desert	Prosperous Mesa Ore-Rich Caverns	Crystal Forest Crystal Reef	Fuming Bog	Dust Desert
+3	Black Soil Fungal Forest Marvelous Oasis Teeming Reef Tropical Island	Geothermal Vents Tempestuous Mountain Underwater Vents	Rich Mountain Submerged Ore Veins

Anomaly features

These Rare Planetary Features are added by random anomalies on habitable planets.

	Feature	Effects	Description
	Abandoned Primitive Homesteads	+10% Society from Jobs +2 Max Agriculture Districts	These abandoned homesteads were once inhabited by a society of reptiles. They still populate the planet, but have since lost all capacity for sapient thought.
	Ancient Mining Site	+5 Max Mining Districts	The site of an ancient mining operation. Despite its age, much of the equipment can still be operated.
	Ancient One	+4 Society Research	An ancient being, living deep beneath the waves, is the dominating life force on this planet.
	Flooded Mounds	+20% Society from Jobs +2 Researcher Jobs	The soil in this valley is extremely fertile, and it is covered in intense greenery.
	Harvester Fields	+6 Max Agriculture Districts	Vast fields of dense, edible vegetation where ancient solar-powered harvesters assist in gathering crops.
	Hyperfertile Valley	+5 Max Agriculture Districts	The soil in this valley is extremely fertile, and it is covered in intense greenery.
	Savage Wildlands	+10% Society from Jobs +1 Researcher Jobs	These indigenous creatures who inhabit this region appear to operate as a single organism.
	Toy Factory Complex	+10% Society from Jobs +20% Engineering from Jobs +2 Researcher Jobs	Complex machinery ceaselessly molds complex polymers into small items of varying shapes and inscrutable purposes.
	Wetware Computer	+20% Engineering from Jobs +2 Researcher Jobs	The oceans on this world are almost completely covered in a fine network of algae that appear to be a primitive wetware computer.
	Zone A	+3 Unity +10% Physics from Jobs +2 Researcher Jobs	A thirteen-by-thirteen kilometer stretch of land on this planet is a ruin of unknown origin, littered with many bizarre and unique alien artifacts. Bafflingly, it also produces sensations of deep contentment in its visitors.

Event features

These Rare Planetary Features are added by certain events.

	Feature	Created By	Effects	Description
	Loop-Plowed Farm	The Waiting World Horizon Signal event	+4 Max Agriculture Districts	The food crops lean into the wind, somehow.
	Spiral-Hewn Mine	The Waiting World Horizon Signal event	+4 Max Mining Districts	Narrow shafts twist around spiraling minerals veins.
	Migrating Forests	Migrating Forests event	-1 Max Agriculture Districts -1 Max Generator Districts -1 Max Mining Districts	The mobile forests of this world frequently migrate en masse to new regions, disrupting efforts at building roads, power lines and other infrastructure.
	Migrating Forests Reserve	Ending the Migrating Forests event peacefully	+20% Society from Jobs +2 Researcher Jobs	This entire region has been set aside for the migrating forests that are native to this world. Here they can roam in peace, without causing damage to urban centers.
	Ancient Bombardment Craters	What Happened Here event (20% chance)	+20% Physics from Jobs +2 Researcher Jobs	This world was subjected to intense orbital bombardment long ago. Parts of the surface are still pockmarked with impact craters.
	Ancient Battlefield	What Happened Here event (20% chance)	+20% Engineering from Jobs +2 Researcher Jobs	The civilization that once inhabited this world was destroyed by an invading force from somewhere beyond their solar system. This ancient battlefield is littered with ancient debris from their desperate last stand.
	Irradiated Ruins	What Happened Here event (20% chance)	+20% Society from Jobs +2 Researcher Jobs	Remnants of a massive nuclear war waged by the two global superpowers that once inhabited this world.
	Subterranean Contact Zone	Seismic Disturbances event (Establish Communications Special Project)	+2 Max Generator Districts +2 Max Districts +1 Subterranean Liaison Officer Job per 20 Pops	An area where Subterranean dwellers and Surfacers can work together towards peace and prosperity.
	Subterranean Farming Caverns	Seismic Disturbances event (Preemptive Strike Special Project)	+3 Max Agriculture Districts +2 Max Districts	A network of vast caverns which contain numerous fungal farms, hunting areas, and lakes teeming with edible flora and fauna.
	Subterranean Generator Areas	Seismic Disturbances event (Preemptive Strike Special Project)	+3 Max Generator Districts +2 Max Districts	Subterranean rivers and the geothermal energy from the molten core of the planet offer vast potential for energy generation.
	Subterranean Mining Sites	Seismic Disturbances event (Preemptive Strike Special Project)	+3 Max Mining Districts +2 Max Districts	Underground tunnels lead to a variety of mineral-rich ore veins inaccessible from the surface.
	Mutant Landfill	Abandoned Terraforming Equipment event	+20% Society from Jobs +2 Researcher Jobs	A putrid mass of dead horrors. Their volatile organic matter has twisted together to form a structure of sorts.
	Impact Crater	Space Bounty event	+3 Max Mining Districts	A crater from a large meteor impact. Minerals from the meteor itself can still be found at the site.
	Odd Factory	An Odd Factor event	+1 Odd Factory Worker Job	A well-crafted facility that produces high value resources, left on the planet by a different civilization.
	Ancient Particle Accelerator	Ruined Particle Accelerator event	+20% Physics from Jobs +2 Researcher Jobs	This old particle accelerator was built using a novel design, and the surviving terminals within the structure contain a massive amount of research data composed by what much have been a brilliant theoretical scientist.
	Underground Vault	Underground Vault event	+20% Society from Jobs +2 Researcher Jobs	A massive underground vault, intended as a bomb shelter by this world's original inhabitants. The vault's occupants turned on each other when their food ran out.
	Cryonic Clones Monument	Clones in Cryostasis event	+6 Society Research	Hundreds on alien clones were left sealed in cryostasis chambers when this Ring World was still a ruin. Now fully restored, the clones have been preserved in this monument.
	Processing Pens	Wild Eukaryotes event	+14 Food	The fungoids native to this planet were genetically engineered to be docile...and delicious. In these vast processing pens, the fungoids are nourished and then harvested.
	Titanic Lifeforms	Titanic Life event	-1 Max Districts +4 Society Research	Numerous Titanic aliens make this area their home, it would be wise to avoid it.
	Portal Research Area	The Mysterious Moon event	+1 Dimensional Portal Researcher Job +1 Dimensional Portal Researcher Job per 40 pops	A secure complex has been built around the Dimensional Portal to house research staff dedicated to probing its mysteries.
	Dragonslayer Monument	Defeating the Ether Drake	+15 Unity	A monument commemorating the defeat of the Ether Drake.
	Numa's Breath	Numistic Order caravan deal	+3 Max Generator Districts +2 Max Districts	This stable bent reaching into the planet's crust was created by The Numistic Order.

Unique features

A number of unique planets in the galaxy come with special Planetary Features.

	Feature	Planets	Effects	Description
	Valley of Zanaam	Zanaam	+30% Research from Jobs	This Valley is home to a mysterious obelisk that is covered in letters from a dead alien language. It hums with power and those in its proximity suffer headaches.
	Junk Canals	Junk Rattlings planets	+3 Max Agriculture Districts	These narrow canals shake around the junk piles, and some adjacent soil is surprisingly fertile.
	Junk Hollows	Junk Rattlings planets	+3 Max Generator Districts	These hollows deep beneath the surface junk would serve well as isolated reactor chambers.
	Junk Wastes	Junk Rattlings planets	+3 Max Mining Districts	The wastes stretch as far as one can see, with occasional pieces of larger junk jutting up out of the ground.
	Metal Boneyards	Driven Assimilator and Determined Exterminator homeworlds	+4 Max Mining Districts +10% Society Research from Jobs	The hollowed-out metal skeletons of fallen infrastructure seem almost to groan as the wind whistles through them.
	Organic Landfills	Determined Exterminator homeworlds	+4 Max Generator Districts +10% Society Research from Jobs	Toxic biohazard waste rots and fumes in vast heaps under the sun.

Earth features

Earth will always feature 9 unique Planetary Features instead of randomized ones. Their description also reveals part of humanity's history before the events of Stellaris.

	Feature	Effects	Description
	Delhi Sprawl	+2 Max Generator Districts	Lakshmi Commerce Tower was the tallest building on Earth for the better part of the 22nd century, and its unique shape remains an iconic feature of the Delhi skyline.
	BosWash Metropolitan Axis	+3 Max Generator Districts	The BosWash Riots traumatized an entire generation and led to sweeping legal reforms. Never Forget!
	Pearl River Agglomerate	+3 Max Generator Districts	The first region on Earth to be officially designated a megacity. Several other developing urban regions would eventually adopt their own versions of the Golden Delta's successful anti-pollution policies.
	Mauritanian Security Zone	+1 Max Mining Districts	Unexploded munitions are still occasionally found near the compound where Colonel Tetchu and the remnants of his brigade made their famous last stand.
	Mesopotamian Urban Corridor	+3 Max Mining Districts	The megalopolis that stretches along most of the Fertile Crescent is in itself a monument to this ancient birthplace of civilization.
	Great Albertan Crater	+3 Max Mining Districts	When 711494 Satis approached Earth and triggered the Great Panic of '72, everyone thought this was it - the Big One had finally arrived. Fortunately, it wasn't big enough to cause an extinction event. Unfortunately, it wiped out much of Alberta.
	Scandinavian Reclamation Sector	+1 Max Agriculture Districts	Reclamation efforts in the late 22nd century eliminated all but the most stubborn pockets of radiation, and mutation levels are now at an all-time low since the Containment Breach.
	Saharan Irrigation Project	+4 Max Agriculture Districts	Few today remember the vicious ridicule that Operation Green Sahara faced when it was first proposed by Professor Izquierdo.
	Pacific Algae Tracts	+3 Max Agriculture Districts	Invisible until you plunge beneath the waves, the algae tracts seem to stretch into infinity.

Blockers

Blockers are obstacles that block Planetary Features. Until a Blocker is cleared the obstructed Planetary Feature cannot be exploited. Each also reduces the maximum number of Districts on the planet by 1 or more, so they are worth clearing even if the extra possible districts are never built. Blockers can be cleared for a modest cost in minerals, energy, and time, if the player has researched the required technology. There are 9 such technologies, one for every normal blocker type, and they are all relatively easy to research. All normal blockers cost the same amount of resources to remove.

Taking the Mastery of Nature ascension perk will reduce the cost of clearing blocks by 33%.

	Blocker	Spawn chance	Removal cost	Required removal tech	Description
	Active Volcano	x0.5 if Alpine x0.5 if Planet Size < 15 x0 if world is a moon	1000 270	Deep Crust Engineering	There is an active volcano in this region, spewing forth lava and volcanic gases.
	Bomb Crater	x0 if not Tomb World	800 270		This massive crater was created by the detonation of a particularly devastating hydrogen bomb.
	City Ruins	x0 if not Tomb World	1200 360		Once a great city, now just a metal boneyard stretching as far as the eye can see.
	Dangerous Wildlife	x2 if Hostile Fauna modifier x10 if Titanic Life modifier x0.5 if Planet Size < 15 x0 if world is a moon	500 270	Dangerous Wildlife Removal	The wildlife in this region is particularly lethal, with many dangerous predators and poisonous plants.
	Deep Sinkhole	x2 if Arid x2 if Savannah	500 180	Subterranean Colonization	A colossal sinkhole covers most of this region.
	Dense Jungle	x2 if Tropical x2 if Continental	500 180	Selective Defoliants	This entire region is completely overgrown with thick, impassable jungle.
	Massive Glacier	x2 if Alpine x2 if Arctic	500 180	Climate Control Network	An immense body of dense ice covers this region.
	Mountain Range	x2 if Alpine x0.5 if Planet Size < 15 x0 if world is a moon	1000 270	Planetary Resurfacing	A vast range of tall and impassable mountains stretches across this region.
	Noxious Swamp	x2 if Tundra	500 180	Xeno-Hydraulic Mastery	Treacherous swamplands and bogs surrounded by putrid gases.
	Quicksand Basin	x2 if Desert	500 180	Soil Remediation	A vast body of quicksand covers this region, making construction impossible.
	Radioactive Wasteland	x0 if not Tomb World	800 270		Few organisms can survive in this desolate, irradiated wasteland.
	Toxic Kelp	x2 if Ocean	500 180	Ocean Ecology Management	A thick forest of kelp that is toxic to most forms of life covers the ocean in this region.
	Rifts	Cracking	500 120		Seismological phenomena are causing the planet crust to crack, spewing out sulfuric gases and toxic slime.

Homeworld blockers

Two or three of each of these blockers are automatically generated on every empire's homeworld. They don't require technology to be removed and all cost 300 Energy and take 120 days to remove.

	Blocker	Clear rewards	Source	Description
	Sprawling Slums	1 Pop	Organic homeworlds Can also appear from the Lost to Bureaucracy event	This region is covered by vast shanty towns and slums filled with the poor and the outcast. It contributes nothing to society.
	Industrial Wasteland		Organic and homeworlds Can also appear from the Lost to Bureaucracy event	This region is covered by ruined industrial complexes and toxic soil; detritus from a past age of progress.
	Collapsed Burrows	1 Pop	Hive Mind homeworlds	This site once housed extensive underground tunnel systems inhabited by the Hive, but was abandoned due to overexploitation of local resources and wildlife.
	Abandoned Strip Mine		Machine Intelligence homeworlds	This area was heavily strip mined in the past, by older and more primitive machine models that unfortunately were not programmed to take future development of the region into account.
	Long-Abandoned City	Metal Boneyards Planetary Feature	Machine Intelligence homeworlds	The crumbling remains of what must once have been a major population center on the planet. No traces of its past inhabitants remain.
	Unsupervised Settlement	1 Pop	Rogue Servitor homeworlds	A pocket of organic society on this world still exists outside of machine supervision. Violence, disease and starvation runs rampant inside the settlement's walls, whose inhabitants have regressed technologically by several centuries.
	Silent Ruins	Organic Landfills Planetary Feature	Driven Assimilator homeworlds	This once major settlement is now a crumbling ruin, occupied only by the decaying bodies of those organics that chose self-termination rather than be assimilated.
	Former Organic City	Metal Boneyards Planetary Feature	Determined Exterminator homeworlds	The charred and irradiated ruins of what was once a major organic population center. Those buildings that still remain standing contain nothing but ashes now.
	Battlefield Remains	Organic Landfills Planetary Feature	Determined Exterminator homeworlds	Tens of thousands of burnt warmachines and the twisted skeletal remains of organic soldiers litter the ground at this former battlefield. Residual pockets of radiation interfere with most electronics.
	Settled Ruins	1 Pop	Post-Apocalyptic homeworlds	A scattered population of scavengers are eking out a desperate existence in the ruins of this once major city.
	Radiation Zone		Post-Apocalyptic homeworlds	A region that was the target of numerous nuclear warheads. Though the radiation in this area has gone down since the initial impact, it is still unfit for habitation barring a major clean-up effort.
	Great Pacific Algae Tract	Pacific Algae Tracts Planetary Feature	Earth	A swirling miasma of plastic refuse covers a good portion of Earth's largest ocean.

Celestial body modifiers

There is a small chance that a celestial body will have one or more modifiers. They will be found when surveyed or through anomalies and accompanying events.

	Modifier	Effects	Spawn chance	Removed by terraforming	Description
	Bleak	−5% Habitability −10% Food from Jobs −2 Max Agriculture Districts	x0 if Tropical x0 if Lush	Yes	Life struggles to survive here, and while some clings to a tenacious existence it is anemic and sickly.
	Irradiated	−10% Habitability −20% Biological Happiness −50% Food from Jobs −6 Max Agriculture Districts +2 Max Mining Districts		Yes	Some long-ago calamity rendered this planet rather heavily irradiated.
	Poor Quality Minerals	−25% Minerals from Jobs −3 Max Mining Districts	x4 if Low Gravity x0 if Carbon World	No	It is unknown if this planet simply formed this way, or if some unknown race once stripped it of its more valuable resources. However, we do know that the minerals present on this planet are of unusally poor quality.
	Tidal Locked	−30% Max Districts	x3 if moon	No	This world is tidally locked around its star, meaning that one side always has daylight while the other is locked in eternal darkness. If life exists here, it is likely limited to the twilight regions where the two sides meet.
	Unstable Tectonics	−10% Habitability −5% Happiness +20% Engineering from Jobs	x4 if High Gravity	No	This world has very unstable plate tectonics and is prone to massive earthquakes and volcanic activity.
	Weak Magnetic Field	−5% Habitability −5% Pop Growth speed	x2 if Low Gravity x0 if Strong Magnetic Field	No	Although habitable, this world has a weak or non-existent magnetic field that offers little protection against cosmic radiation.
	Asteroid Impacts	−5% Habitability +5% Minerals from Jobs +2 Max Mining Districts		No	The orbital path this world takes around its star is littered with small asteroids, meteors, and comet swarms. Large impacts on the surface occur at an alarming frequency.
	Atmospheric Hallucinogen	+5% Biological Pop Happiness +10% Physics from Jobs −30% Government Ethics Attraction		Machine World only	The air of this planet contains a natural hallucinogen. While this does keep people happy, and indeed seems to aid the visualization of some of the more esoteric Physics problems, it also distracts people from other work.
	Hazardous Weather	−10% Habitability −5% Happiness +20% Energy from Jobs +4 Max Generator Districts		Yes	This world suffers from unstable weather patterns, with violent storms frequently appearing out of nowhere to wreak havoc on the surface.
	Hostile Fauna	−10% Habitability −5% Happiness +20% Society From Jobs	x2 if Lush x2 if High Gravity x2 if Titanic Life	Yes	This world has evolved extremely Hostile Fauna, and the surface is rife with lethal predators waiting to ambush their next meal. Their biology offers great research opportunities, however.
	High Gravity	+10% Building cost +10% District cost −5% Habitability +2 Max Districts	x2 if Planet Size > 19 x0 if Planet Size < 12 x0 if Low Gravity	No	This planet is unusually dense and so has uncomfortably high gravity.
	Low Gravity	−10% Building cost −5% Habitability	x0.5 if Planet Size >19 x0 if High Gravity	No	This planet has an unusually low density and therefore much lower gravity than most planets of comparable size.
	Wild Storms	−5% Habitability −5% Happiness +20% Physics from Jobs		Yes	Spectacular electrical storms wrack this planet's atmosphere on a semi-regular basis.
	Asteroid Belt	+10% Minerals from Jobs +3 Max Mining Districts	x0 if moon x2 if Low Gravity	No	Perhaps this planet once had a moon which was destroyed in some calamity, or perhaps its orbital debris never fully coalesced in the first place. Whatever the cause, this planet is surrounded by a belt of small asteroids.
	Atmospheric Aphrodisiac	+5% Habitability +10% Pop Growth speed −20% Government ethics attraction		Machine World only	Something in the air of this planet seems to put people in the mood to reproduce.
	Carbon World	+15% Minerals from Jobs	x0 if not Barren	No	This world has been formed mostly out of carbon, and contains little oxygen.
	Exceptional Quality Minerals	+25% Minerals from Jobs +8 Max Mining Districts	x8 if High Gravity x0 if Carbon World	No	The exceptional quality of the minerals in this planet's crust provides a truly staggering opportunity for mining.
	Extensive Moon System	+10% Minerals from Jobs +1 Max Mining Districts	x0 if not Gas Giant x0 if no moons	No	This gas giant has an unusually large amount of natural satellites. Hundreds of small moons and moonlets orbit the planet.
	High Quality Minerals	+15% Minerals from Jobs +4 Max Mining Districts	x4 if High Gravity x0 if Carbon World	No	An abundance of high quality minerals in this planet's crust makes mining here a lucrative business.
	Lush	+10% Habitability +20% Food from Jobs +4 Max Agriculture Districts	x3 if Gaia x2 if Low Gravity x0 if Bleak	Machine World only	Life thrives here, the fauna is plentiful and the flora grows rapidly.
	Natural Beauty	+5% Happiness +25% Migration Pull	x3 if Gaia	Machine World only	The scenery on this planet is simply beautiful, anyone living on this planet will be constantly finding new wonders to behold.
	Strong Magnetic Field	+5% Energy from Jobs +5% Physics from Jobs +2 Max Generator Districts	x2 if High Gravity x0 if Weak Magnetic Field	No	This planet has an abnormally high magnetic field. This will interfere with many of our instruments and computers.
	Titanic Life	+25% Society from Jobs	x8 if High Gravity x0.5 if Low Gravity x0 if Hostile Fauna	No	The lifeforms of this planet are built on a massive scale and can be incredibly dangerous even without meaning any harm.
	Terraforming Candidate	Can be terraformed	Barren World anomaly Worlds made Barren by a crisis Always present on Mars	Yes	Though barren and devoid of life, this planet has water in frozen form and may once have been home to a thriving ecosystem. With the right technology, it could be terraformed into a habitable world.
	Holy World	−200 Opinion with FE if colonized	Prophets Retreat Walled Garden Emerald Mausoleum Pristine Jewel	No	The planet is considered sacred by a nearby Fallen Empire. Colonizing it will anger them greatly.
	Paridayda	+10% Happiness +10% Unity from Jobs +20% Food from Jobs +25% Migration Pull	Unique to the Gaia world Paridayda	No	A paradiasaical world of unparalleled beauty.

Event Modifiers

These planet modifiers can only be added by events.

	Modifier	Effects	Event	Description
	Subterranean Civilization	+10% Society from Jobs	Seismic Disturbances (Establish Communications Special Project)	A subterranean alien civilization on this world enjoys a good relationship with the colonists on the surface, and both parties frequently engage in trade and cultural exchanges.
	Subterranean Cities	+3 Max Districts	Seismic Disturbances (Preemptive Strike Special Project)	A indigenous subterranean civilization that once lived on this world has been exterminated, and colonists are now free to expand into their abandoned underground cities.
	Ancient Terraforming	+20% Pop Growth Speed	Abandoned Terraforming Equipment (Resume Process Special Project)	Ancient terraforming techniques have turned this world into a lush paradise.
	Abandoned Terraforming Project	-20% Food from Jobs -10% Happiness	Abandoned Terraforming Equipment (Dismantle Equipment Special Project)	This world was partially terraformed thousands of years ago, but the process was interrupted for unknown reasons. The result is a highly unstable climate system and biosphere.
	Surviving Infrastructure	-25% District Cost	Surviving Infrastructure	There is still a significant amount of infrastructure left on this world, built by its original inhabitants before they destroyed themselves in a nuclear war. This will aid in the construction of new buildings.
	Loop Temple Visitor Center	+5% Happiness	The Loop Temple: Time and Stone	Cheery, efficient staff guided tours past primordial sigils bright under floodlights and marked with helpful plaques.
	Loop Temple Pilgirms' Way	+10% Happiness	The Loop Temple: Time and Stone Spiritualist option	Once again, the basalt arches whisper with the hushing of feet and the echo of prayers.
	Superflare Shielding	+10% Unity from Jobs	Superflare (Superflare Shielding special project)	This planet's populace is shielded from the harmful effects of it's sun's superflare activity.

Anomaly Modifiers

These planet modifiers can only be added by random anomalies.

	Modifier	Effects	Description
	Ancient Harvesters	+20% Food from Jobs	Ancient solar-powered harvesters assist in gathering the planet's crops
	Dead god	+200% Spiritualist Ethics Attraction	The corpse of some gargantuan alien creature keeps silent vigil in orbit over this planet.
	Resonant Crystals	+33% Governing Ethics Attraction +10% Happiness	The resonant crystals that line this planet's tectonic crust resonate at a medically therapeutic frequency for our species.
	Soothing Magnetism	+50% Unity from Jobs	This planet's magnetosphere resonates at a frequency very conductive to our neural network.

References

Game concepts