Questions tagged [xenobiology]
For questions related to the biology of extra-terrestrial organisms. This tag implies the use of the science-fiction tag. Use the science-based or hard-science tags to impose greater scientific restrictions (see warning in tag wiki). The goal of this tag is to answer the question using known science.
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How plausible might planimals be, and what would they be like?
This question is in relation to speculative biology/evolution: A genre of science fiction and hypothetical branch of science which seeks to explore "what if" questions about life using ...
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Insectoids and the concept of 'eating well' [closed]
In this project of mine a species of sapient, spacefaring insectoids exists among humans and humanoid species. The insectoids are puzzled by something in humanoid cultures- specifically the idea of ...
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How to support the evolution of a giant creature across generations [closed]
In my story, in which I want to rely on scientific logic as much as possible, I want a creature to evolve to become at least the size of a country and you can live in space.
The means of evolution for ...
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Symbiotic brain [closed]
I like to take mythological humanoid creatures and reimagine them in multiple species of primates. For instance, wendigos are just skinny-but-strong gigantopithecus that wear bones/skull of their prey....
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Indium and Gallium Toxicity: Part 2
Note: This is the second part of a question. The first part can be found here and part 3 can be found here.
Incorporating some feedback from the answers I got to the question above, I have made a few ...
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Indium and Gallium Toxicity: Part 1 [closed]
I am making a planet and my crust is rich in gallium and its heavy counterpart, indium from a cosmic fluke (gallium and indium are both at a concentration of about 0.01% in the crust). However, most ...
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Fingers with extra joints
The second and third editions of the Dungeons and Dragons role-playing game featured a humanoid race (named an Arcane in 2nd edition and a Mercane in later editions) with a particular anatomical quirk,...
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Is there a maximum number of fingers a species can have in each hand? [closed]
We have 5 fingers in each hand (10 fingers in both hands). So we count in a base of 10 (decimal base) which has the accepted digits of 0 to 9. Higher bases have more accepted digits; for example ...
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Adaptations for a planet with high atmospheric pressure, to avoid nitrogen narcosis?
I'm building a some hypothetical habitable planets for a book, and one of these planets has a thick atmosphere (around 10 bar). I'm not sure if it's even possible, but I want to figure out how the ...
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My humanoid aliens inhabit a rainforest planet and are super smart -- what do they look like? [closed]
I'm currently working on a sci-fi game and need some ideas for one of the alien species.
They live on a rain forest planet and are one of the most intelligent species in the game. They also need to be ...
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Feasibility of a convergent neural code across species?
I've got a sort of "mind-reading" system involving interpretation of electric fields/impulses in the brain, basically an advanced BCI (brain-computer interface), but the key point of this ...
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How to Optimize CO2 and H2 Intake for a Sessile Methane-Producing Organism
What features, in addition to maximizing surface area, are necessary to optimize the intake of CO2 and H2 for a sessile, multicellular methanogenic organism?
This organism lives at depths of 10 ...
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Xenon Anesthetic Hazard
I have been designing a planet with an atmosphere of about:
Nitrogen (N2) - 61.5%
Oxygen (O2) - 21%
Neon (Ne) - 15.5%
Xenon (Xe) - 1%
Water Vapor (H2O) - 0.5%
Argon (Ar) - 0.479%
Carbon Dioxide (CO2) ...
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Ammonia transporting blood
Okay essentially I am designing an alien ecosystem with an ammonia and methane based metabolism. Here's the formula for the metabolism animal analogs use on this planet:
$$\ce{3CH2O + 4NH3 -> 3CH4 +...
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What explanations can be used for how a humanoid's body is able to spontaneously combust as a natural part of its early stage decomposition?
Some form of chemical reaction interacting with the digestive system for a start?
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How deep underwater can red photosynthesis work?
The Setting:
I have a binary star system.
First star: K5.2V class Orange Dwarf, 60% the mass of Sol, 17% luminosity of Sol, and at 4.5 billion years old. This star is the only one with a planetary ...
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Are there any alternative genetic systems which could allow for the development of emergent complexity?
DISCLAIMER: I am an (intensely interested) layman, not a scientist. Please take my summation of the following concepts accordingly.
I'm currently trying to worldbuild a plausible alien species down to ...
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How would a hydrogen breathing Life-form respire?
What kind of cellular structure converts hydrogen and oxygen to water and vice-versa. If have calculated the energy released by the combustion of oxygen and hydrogen to be 572 kJ enough to create 22 ...
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Biological human-alien language barrier
Something I've been pondering- spacefaring humanity makes contact with alien species who, while being intelligent enough to learn to understand human languages, their throats or vocal cords (assuming ...
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High Gravity Giant Shell
I am designing a genus of eusocial, high-temperature, extraterrestrials from the planet 61 Virginis b. They are based on tungsten chloride and use sodium chloride as a solvent. This species has ...
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Is there any plausible way for dry-vacuum based biology to evolve?
Basically instead of being what we would call wet nanotechnology which is what our biology could be described as, imagine if you will, organisms that evolved from 'dry nanotechnology' who are native ...
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Is there any way a species could evolve to run across lava using the leidenfrost effect?
So far all I really know is that the leidenfrost effect would work, just not exactly how the species would have evolved it, but I do know it would require a store of water, likely like that of a camel....
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How does this microbe recognize specific chemical patterns?
This species of bacteria is electroreceptive, and when it receives an input pattern of electric spikes, it can “translate” that input pattern into a pattern of chemical signals internally via its ...
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If we were to discover an alien ecosystem that has a D-configuration of proteins, how would it react to our L-sided biology?
I'm working on a hard-sci-fi story where a scientist discovers microorganisms in our solar system with disastrous results. I was thinking about how any cross-contamination with an alien ecosystem ...
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Replacing Light in Photosynthesis with Electric Energy
I am currently attempting to construct my alien planet with exotic forms of life that use alternative metabolisms.
I got an idea that I could perhaps somehow replace the photon energy required in ...
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How could a carbon-based mechanical lifeform evolve naturally? [closed]
Imagine that there is an inhabitable planet that has just been discovered by human colonists. All of the unicellular life and some multicellular life such as plants is normal carbon based life made of ...
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What would cause protein shapes to be the same across unrelated species?
One sort of “rule” I’m working with in my world is that among carbon-based, protein-having species, even those from different planets with no shared evolutionary ancestry, proteins that may be ...
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Biped species with trunk evolved to use for locomotion
So currently in my speculative evolution scenario, I have a creature with an elongated trunk that it uses for rock climbing. This species transitions to a savannah like lifestyle and I was wondering ...
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Exobiology Using Hydrazine as an Alternative (or Supplementary) Solvent to Water
My question is this - are there any reasons why hydrazine may jump out as a poor solvent for a complex system such as life?
I am working on a worldbuilding sci-fi project and I was looking through a ...
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Is this Wingspan Enough/Necessary for My World's Parameters?
I have a species of sapient humanoids in my world capable of flight using 24 foot wide wings. The world's being used for a science-fantasy world, so I'd like some realism, but some can be handwaved. ...
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"Hard" SF reaction to "Soft" SF Aliens
When we consider what alien life might look like, it seems more likely that life would be, well, very alien. There is no reason to expect bipedal, human-shaped and human-sized creatures. Or to expect ...
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Could a (semi-)universal information-storing molecule exist?
So let’s say I’ve got a new product, some sort of injection or other substance that allows customers to put a trait of some sort into some of their cells. It doesn’t have to be self-sustaining or ...
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A planet *without vertebrates. (*mostly, restrictions apply)
I'm thinking about the evolutionary history of life on a world very similar to earth in many ways, carbon based life, life began in the seas, creatures like cephalopods, and arthropods, evolve.
But, ...
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How would I get a moose sized creature with no mouth to be able to survive?
The creature I have thought up has no mouth or eyes. It doesn't eat or drink. It feeds off of the energy present at the core of it planet.
The creature is the size of a moose. It has a skeletal and ...
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Could plants orbiting an active enough star (one that’s around F-type) evolve photo-voltaic cells as the star “calms down”?
Wanted to create Flora (and maybe organisms overall) that evolved near stark white coloration due to the high output of radiation from it’s, at the time, high energy F-Type star.
It’s a star and of it’...
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Could a life form be genetically modified to use D-form amino acids?
It is now known that life on earth uses D-form sugars and L-form amino acids. However, it is also known that life on other worlds might be the other way around; using L-form sugars or D-form amino ...
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Would it be possible for a creature to change to be able to live in most extreme environments
My world of Find out is somewhat like earth having all the same environments in addition to many more of the extreme ones. For example: bigger temperature differences during seasons, more underwater ...
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What could lead to an ability to “share instincts” to evolve? [closed]
So there’s a small animal species that live pretty simple lifestyles of eat, don’t be eaten, reproduce, and that’s it. They live in forest/jungle or swampy environments, eat a wide diet of insects or ...
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How can I make this mode of reproduction make sense?
I'm workshopping a sapient fantasy species, that, in lore, was designed by external forces to be a biological weapon. This species accomplishes this with a form of sexual parasitism that enables them ...
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Reductive instead of oxidative based metabolism
Is it possible to have a cellular metabolism based on reduction instead of oxidation? All known life currently uses some sort of oxidation in cellular respiration, either from oxygen or from oxidizing ...
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Why might a civilisation of robots invent organic organisms like humans or cows?
In a civilisation of robots (of unknown origin) on an isolated, desolated planet, what motivation might they have for purposefully trying to invent organic organisms?
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On a planet whose waters are super rich in iron, could life forms use the iron as a basis for their skeletons?
One of my planets has surface waters that are incredibly rich in oxidized iron, and I was intrigued by the possibility of alternate materials for bones when I came across Stephen Gillett's Clorox ...
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Aside from humanoid, what other body builds would be viable for an (intelligence wise) human-like sentient species? [closed]
Sentient alien species in fiction are almost always at least vaguely humanoid. Is being humanoid required to have human-like intelligence and sentience? If not, what other body builds would be viable ...
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Would an asexually reproducing Humanoid species have any form of romance or sexual pleasure?
So I have a setting where the main sapient species is a very closely Humanoid race. In this setting, Humans, along with many other species across a number of dimensions, are all descended from an ...
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Effects of metal-augmented skeletons on behaviour and evolution
In the planet I'm working on, strong tidal forces meant early on in evolutionary history most organisms developed a nacre or chitin-like composites with calcium carbonate, even in internal skeletons.
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Exotic life in a brown dwarf
From what I have seen in the discussions here about possible life on brown dwarfs, it’s concluded that no complex chemical life (even metallic or CNT based ones) can survive the radiation and gravity ...
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How fast would this astronomical macromorph be?
I’m taking inspiration from Robert A. Freitas Jr.’s theory about alien metabolisms based on gravity rather than electromagnetism. He imagines astronomically sized beings that derive energy by ...
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What would life be like that uses liquid nitrogen as a solvent instead of water? [closed]
I'm working on a worldbuilding project and want to have an intelligent species from a planet where liquid nitrogen is the dominant solvent, not water. I plan on building the planet backwards from here ...
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What adaptations would allow a being to live in tritiated water? [closed]
I am interested in having the monster of the week for an episode/arc be a creature that lives in a stream of tritiated water (T2O).
The said creature is a colony of microorganisms that have evolved ...
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What would a planet with fifty foot tall arachnids need to make this possible?
I'm writing a race for my series. They are a large terrestrial arachnid-like species, with fifty feet being their minimum height. The idea is that they evolved over millions of years, leading to their ...
