...it's like TV Tropes, but LINKED DATA!
Extremophile Lifeforms
- 234 statements
- 42 feature instances
- 25 referencing feature instances
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When our present-day astronomers think about life on other planets, a term that gets thrown around a lot is the "Goldilocks Zone", the range of distances from the parent star where a planet could have liquid water. This is the only range of temperatures where life as we know it can exist. The only life-bearing planet we know of is in Sol's Goldilocks Zone, and all life on it requires water. However, even on our planet, life-forms are able to survive well below 0°C and well above 100°C (i.e. outside the liquid range of water at earth's standard atmospheric pressure) and in all manner of other extreme conditions, as per the "real life" section of this page. Some alien life in fiction, however, does not roll that way. These lifeforms live in glowing-hot worlds with molten metal in their veins, or on icy ones with liquid helium metabolisms. They often have vastly different dietary needs, such as rock or metal. The planets they live on are generally Single Biome Planets by our standards, although they may be lush and varied to local eyes, and their inhabitants may seem like Elemental Embodiments. They're likely to be Starfish Aliens due to the radically different environment, though they can take more recognizable forms. Compare to Silicon-Based Life, with which it often overlaps. Contrast Energy Beings, who can presumably survive anywhere, but whose environmental preferences tend to be simply ignored. |
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Hamster's Paradise (Blog) | |
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The Star Trek Online Foundry mission "Relics" has the extinct Ugcinians, yet another species from a Class Y planet. They went extinct hundreds of years ago because their sun went supernova and their starship technology wasn't up to duplicating a Class Y atmosphere. | |
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The Saga of Seven Suns has the hydrogues, bizarre elemental aliens that live deep in the high-pressure cores of gas giants. They appear to be made of liquid metallic hydrogen and will die by Explosive Decompression in normal atmospheric pressure. When hydrogues need to appear in person on a planetary surface, they seal themselves in pressurized diamond spheres, which they can decompress as powerful suicide bombs. | |
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In Honor Harrington, the population of Grayson developped resistance to heavy metals poisoning, enabling them to survive on this planet, although with shortened lifespans. | |
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Kirby: Kirby's Return to Dream Land: A recurring Invincible Minor Minion in the game is Barbar, a gigantic eel that tries to swallow Kirby whole. While these enemies are normally native to Onion Ocean and the sewers of Egg Engines, the final area of the game introduces the Iron Barbar, a much scarier variant that surfaces out of nowhere from molten lava and looks like it's covered in igneous armor. Kirby: Triple Deluxe: Pyribbit, the boss of Endless Explosions, is a huge frog-like creature described as living near the volcanoes and thriving off lava and hot rocks. |
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Dragon's Egg: The Cheela live on a neutron star. The gravitational pull on its surface is 67 billion times that of Earth, and the temperature is hotter than the Sun. | |
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Kirby's Return to Dream Land: A recurring Invincible Minor Minion in the game is Barbar, a gigantic eel that tries to swallow Kirby whole. While these enemies are normally native to Onion Ocean and the sewers of Egg Engines, the final area of the game introduces the Iron Barbar, a much scarier variant that surfaces out of nowhere from molten lava and looks like it's covered in igneous armor. | |
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The Nusurans in Janitors of the Post-Apocalypse are based around tardigrades. They take naked spacewalks for fun, and are the only species in the setting harder to kill than cured humans. | |
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Neon Genesis Evangelion has the 8th angel, Sandalphon, which looks like an Anomalocaris. It was discovered in a volcano in embryonic form, and later ages rapidly to a subadult form, it was shown to be completely unaffected by lava both internally and externally, and was able to swim through it as if it were water. | |
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Discworld: Trolls are living rocks whose brains are impure silicon, meaning they're slow and stupid under the snowline and extremely intelligent in the cold. However, they're still susceptible to freezing to death — their cold tolerance is much higher than a human's, but it still has its own limits. Golems are made of clay, so they're resistant to a lot of things like lightning (allowing them to be atheists when Discworld gods are trigger-happy with the Bolt of Divine Retribution), heat (they can walk through fire and hold liquid metal), cold, and extreme pressure (one was buried on the ocean floor for centuries). As we find out in Going Postal, they can't take extreme heat and cold at the same time. |
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Lucky Starr: Creatures are discovered on Mercury that look like octopi made of rock that drain heat from any source they find. | |
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Ben 10: Alien Force features a planet that is sun-blasted on one side and ludicrously cold on the other, leaving a small barely-habitable band in the center. Ben asks who would want to live there; the answer is the Necrofridgians, or the mothlike Big Chill species. | |
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Pathfinder: Targothas are fishlike alien organisms that evolved on a planet largely covered by hydrocarbon seas. A small population was carried to Golarion by a crashed starship, and despite the overall hostility of Golarion's dry, water-rich alien climate managed to settle a large system tar pits. | |
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Sector General: There's a species of sapient crystals of frozen methane that can only survive close to absolute zero, another who is only comfortable at molten-rock temperature (these two require very heavily-insulated encounter suits to interact with other sentient species), and a culture of Hive Minded radiation-eaters who live inside the space station's main reactor pile. | |
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Mass Effect: The volus originated on a planet with an ammonia atmosphere, with atmospheric pressure so much higher than most other races' homeworlds that they'll burst unless they wear heavy metal pressure suits. | |
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FTL: Faster Than Light: The Lanius are metallic beings who have no trouble living in vacuum. They don't have trouble living in pressurized environment either; they just suck out any surrounding air. | |
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In Project Hail Mary, the Eridians are ammonia-breathing Heavyworlders whose home planet has twice Earth's gravity and an atmosphere twenty-nine times thicker than ours, so thick that no light reaches the surface at all. The Eridians never evolved eyes, and "see" primarily using echolocation. | |
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Star Trek has several examples: Star Trek: The Original Series: The Tholians are silicon-based, arachnoid, crystalline aliens adapted to environments so hot that being subjected to anything lower than 380 Kelvin — about ten degrees above the boiling point of water — will crack their carapace and kill them. The Excalbians come from a planet well outside of class-M standards. They can also exist in space, as demonstrated when one of them takes the form of Abraham Lincoln. Star Trek: The Next Generation has at least two: The huge jellyfish-like aliens seen in "Encounter at Farpoint", luminous and pliant, yet able to survive nicely in the vacuum of space. The "Brancher" alien, also known as the Crystalline Entity, is an enormous tree-like crystal that absorbs the life energy of entire worlds. It is first encountered in the episode "Datalore", where everyone on Omicron Theta had been consumed by the entity, leaving only the deactivated android Lore intact. This brancher can also travel easily through the vacuum of space. Star Trek: Voyager has the Silver Blood, a deuterium-based race encountered on a Class Y planet in "Demon". The episode takes its name from the fact that Class Y planets are sometimes termed "demon" worlds because they're basically Fire and Brimstone Hell (start with temperatures averaging 500 Kelvin and go downhill from there). The Star Trek Online Foundry mission "Relics" has the extinct Ugcinians, yet another species from a Class Y planet. They went extinct hundreds of years ago because their sun went supernova and their starship technology wasn't up to duplicating a Class Y atmosphere. |
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Planet Hulk: The spikes are a race resembling the symbiotes, who naturally float in the vacuum of space and feed off cosmic radiation. They're usually peaceful, but become starved and aggressive in terrestrial atmospheres and become parasite zombies. | |
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The Jan in Alien in a Small Town are silicon/carbon lifeforms native to a frigid planet with a very thin atmosphere, where they drink liquid oxygen the way we drink water. They find Earth's heat and air pressure painfully uncomfortable, and water is toxic to them. Given their preference when visiting Earth, they hang around in the polar regions. The tropics would kill them. Their life-support gear condenses Earth's atmospheric oxygen into a liquid for them. | |
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In The Star Diaries, Ijon Tichy is viewing a video filmed by a probe on a half melted planet. A local professor complains about the cold of 860° Celsius, and dismisses the idea of creatures living on planets as cold as Earth. Another part has a catholic priest complaining about the difficulties of preaching on a certain planet — its inhabitants are freezing at 600° Celsius, so of course they are more interested in Hell than Heaven. | |
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Outsiders from Known Space are vacuum breathers with a metabolism based on liquid helium, and the series also occasionally features amoeboids with superfluid helium liquid media. | |
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Animorphs: The Venber melt in above-zero temperatures. They nearly went extinct when it turned out the resulting liquid had many useful properties. | |
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Alice, Girl from the Future: An airless chasm on an asteroid converted into a Generation Ship is inhabited by "ice dragons" — octopus like creature possibly inspired by the Lucky Starr example. There are also sapient species fitting it — for example, a hotel on one planet was described as too hot to touch despite a thousand layers of insulation. | |
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In the original Ben 10, Heatblast's species lives on the surface of a sun. | |
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Star Trek: The Original Series: The Tholians are silicon-based, arachnoid, crystalline aliens adapted to environments so hot that being subjected to anything lower than 380 Kelvin — about ten degrees above the boiling point of water — will crack their carapace and kill them. The Excalbians come from a planet well outside of class-M standards. They can also exist in space, as demonstrated when one of them takes the form of Abraham Lincoln. |
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The Dark Side of the Sun: The Creapi's homeworld saw them evolve in molten phosphorous sulphides. When they spread into space, they simply redesigned themselves to fit the changing situations they encountered. Half a million years of forced evolution has created the middle-degree Creaps, who are happy at a mere 500 degrees C. The divergent High-Degree Creapii live on the outer surfaces of relatively cool stars. Wherever a star pushes the ambient temperature to beyond the melting point of tin, there you will find Creapii. In fact, they bartered with the human race, who were happy to sign over squatters' rights to the planet Mercury in exchange for Creap technology. To interact with humans they wear "spacesuits" that preserve life at habitable temperatures in what to them is a freezingly sub-zero hostile environment. | |
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The Laundry Files speaks of the Chthonians, codenamed DEEP SEVEN, who live in the upper regions of Earth's mantle. | |
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Eclipse Phase features many Transhuman morphs adapted to extreme environments. Ranging from the "mundane" Rusters adapted to the half-terraformed environment of Mars to Hulders that barely qualify as "biomorphs" and wander the surface of Titan herding similarly modified caribou, and Suryas, Space Whales that live in the corona of the Sun. | |
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Doctor Who: Whatever it was that haunted the planet in "Midnight" is capable on surviving a planet bathed in the X-tonic radiation of its sun, a place where no known life is capable of existing. The Pting from "The Tsuranga Conundrum" lives in space, is essentially impossible to destroy, and foregoes conventional food, subsisting instead on energy drained from technology. |
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Mostly Harmless: Played with. The narration notes that life can exist in all sorts of hostile environments, such as the intoxicating seas of Santraginus V, the fire storms of Frastra, and even New York. | |
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Uplift: Sundiver features creatures that live in the photosphere of the sun, and and are defined more by magnetic fields than chemicals. Some of them are even intelligent, although the "communications" from them during the story events are a hoax. | |
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Ben 10: Omniverse features tungsten-based lifeforms called the Kraaho who need life to be extremely hot to live. Since they decide to make a settlement on Earth, which is far too cold for them, they attempt to cause a lava flow on the surface to make it more habitable. | |
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In The Chronicles of Narnia, there's a deep subterranean land called Bism, which is very hot and features such wonders as fire salamanders and fresh gems full of delicious juice. When the characters encounter some of Bism's natives in a shallower layer of the underworld, these find it far too cold, its rocks too dead, and the endless abyss of the sky far too close for comfort. | |
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In Camelot 30K, the keracks live on a Pluto-like Kuiper Belt object with a surface temperature of 30 Kelvin and only a near-vacuum hydrogen atmosphere. They use oxygen difluoride as a solvent rather than water, and even then they have to use uranium to keep their bodies warm and pressurized. | |
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Star Carrier: This is actually the norm in the series. The Sh'daar Masters state in the third book that out of around 50 million sapient species they've encountered, humans are only the twenty-thousandth or so with a carbon/nitrogen/oxygen/water metabolism. The first book alone shows species both intelligent and not that evolved on planets more like Venus than Earth, and the third mentions intelligent but non-technological life forms in the depths of Europa's ocean. The Turusch, the first sentient aliens seen, evolved in a high-pressure atmosphere consisting mostly of carbon dioxide, with various sulfur compounds making up the rest. They live at temperatures of around 100 degrees Celsius, hot enough that sulfur particles in their air alternate between solid and liquid, and their environment is seething with ultraviolet radiation. Remarkably, this is their planet's equivalent to cold mountaintops, and they can live in even hotter and more pressurized places if needed. The Glothr live in the frigid sea of ammonia-rich water beneath a rogue planet's crust. Their entire metabolism functions at just a hair above freezing, so they think and act very slowly, and even approaching a human could burn them to death. They breathe hydrogen instead of oxygen, since that respiratory pathway functions much better in such cold. Subverted with the Denebans in the eighth book. Originally, Gray and his crew believe they are extremophiles since their ship has an internal temperature of 900 degrees Celsius, but it turns out they are an AI race with no need for physical environments at all. |
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Stellaris: Some species can live on Tomb worlds, created from nuclear wars. | |
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Halo: Lekgolo are eel-like aliens that thrive in the ring system of a gas giant by consuming metals, can survive in a vacuum and the Flood find them difficult to infect because they can only infect one worm at a time, a trait that the Forerunners tried to exploit in their fight against the Flood. Thanolekgolo, a type of Lekgolo gestalt group, take this even further by surviving the thermonuclear detonation of a starship's fusion engines that destroyed a Halo ring, being able to consume just about anything, and ending up being the only living thing on a fragment of the ring. | |
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Lensman: The Palainians aren't comfortable any closer to Sol than Pluto, and their biology extends into the fourth dimension to accommodate this extreme. There are several other species like this, collectively called "frigid-blooded poison-breathers" - it's never stated exactly what gas they breathe or what liquid they use as blood. | |
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Star Control: In order to procreate and spread their colonies, the Mycon terraform Earthlike planets into lava hell holes. They were designed to stabilize Earthlike planets and reproduce in lava hell holes, but over the millennia got their orders mixed up. The Slylandro are a race of intelligent gasbags who live on a gas giant. The Measure are sessile organisms living at the bottom of the sea under intense pressure. Their psychology is surprisingly easy to understand. The Greegrox live in the vacuum of space in a symbiotic relationship with a sapient planet. The Xraki live in possibly the most extreme environment possible: absolute void. They did not, however, evolve there. |
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Kirby: Triple Deluxe: Pyribbit, the boss of Endless Explosions, is a huge frog-like creature described as living near the volcanoes and thriving off lava and hot rocks. | |
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Star Trek: Voyager has the Silver Blood, a deuterium-based race encountered on a Class Y planet in "Demon". The episode takes its name from the fact that Class Y planets are sometimes termed "demon" worlds because they're basically Fire and Brimstone Hell (start with temperatures averaging 500 Kelvin and go downhill from there). | |
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Star Trek: The Next Generation has at least two: The huge jellyfish-like aliens seen in "Encounter at Farpoint", luminous and pliant, yet able to survive nicely in the vacuum of space. The "Brancher" alien, also known as the Crystalline Entity, is an enormous tree-like crystal that absorbs the life energy of entire worlds. It is first encountered in the episode "Datalore", where everyone on Omicron Theta had been consumed by the entity, leaving only the deactivated android Lore intact. This brancher can also travel easily through the vacuum of space. |
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