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Questions tagged [xenobiology]

Use this tag to mark questions related to creating plausible alien biologies that may be close to or far removed from Earthly biology but within the realms of hard science.

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11answers
611 views

On a tidally locked planet, would time be quantized?

Assume a planet that always presents one side to the sun. No moons. The orbit of the planet around the star is essentially spherical, very minor and undetectable aberrations. The orbital period of the ...
2
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1answer
28 views

Biological touch based high bandwidth communication

My alien race is supposed to have the ability to communicate a lot of information extremely fast, more akin to uploading something to your partner's mind than telling him. This should happen via ...
2
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3answers
70 views

Other Mouthparts For Aliens?

What other kind of mouthparts might an alien (intelligent or non-intelligent) have besides the typical jaw with teeth or mandibles? To avoid being too broad a subject, let's assume the aliens need to ...
1
vote
1answer
53 views

on sentient reptiles/ectotherm behaviors [on hold]

so, I was searching and reading things about reptiles trying to build a guideline for any kind of cold blooded peoples/aliens I still have a hard time finding precises idea on how temperature ...
1
vote
0answers
72 views

How could an amorphous species work? [closed]

In the setting I'm building, then there are two lifeforms to have existed; Angel and Demons. Both are closely related, as speciation between happened rather recently in their history. They both also ...
8
votes
6answers
526 views

How to design an organic heat-shield?

When they started dropping from the skies.. or no, they landed. They were so similar to us, yet so different. Like nothing we would've ever designed or created - but so much like everything ...
3
votes
4answers
133 views

Can you create a living vehicle fueled by organic material?

In this world, the vehicles are effectively re-engineered insects; enlarged bio-manufactured nervous systems used instead of engines; factory grown lightweight chassis / [wheels]. The fuel station ...
5
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2answers
49 views

What would Define Ecosystems in a “Frozen Moon with Ocean” World

What factors would influence ecosystem development in an ocean on an ice world? It is thought that several moons in our solar system (e.g. Europa) may have significant oceans under their icy crusts. ...
4
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1answer
202 views

Origin of life on a waterworld

Take a planet like Gliese 1214 B, which has no land, an ocean 100s of kilometres deep and a seabed of Ice VII. For the purposes of the question, let's assume that the pressure and/or temperature near ...
4
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2answers
176 views

Evolution adapted to technology

...kill every protohuman who tries to leave the African continent. This comment made me think about one question. Suppose you have robot guards, like futuristic lasers, who just shoot at any landing ...
5
votes
1answer
177 views

Realistic alternatives to oxygen-based respiration? [closed]

Background I'm developing 6 to 10 sapient alien races for a short story. Basic Story Setting The short story takes place in the Milky Way sometime in the next 1000 years. These races will be at ...
6
votes
6answers
251 views

Dwarfism in a 9 foot tall humanoid race

My story has a race exactly like humans, except they grow to be on average 9 feet tall. One of characters belongs to this race, but she is considered a dwarf to her people. This causes her to live ...
7
votes
1answer
98 views

How fast could a large creature feasibly grow and how much would it need to eat?

A creature in my story was largely inspired by the xenomorphs of the Alien franchise. In wondering how long it would take one of these creatures to grow from conception to maturity, I decided to look ...
5
votes
1answer
121 views

Determining factor(s) for making creatures robust to square cubed law

Premise and research I am simply trying to find a reproducible framework for use with creature-design. In my research I have found the larger an animal is, the more likely that animal is to break its ...
7
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3answers
694 views

Life on a gas giant?

I know of the conceptualized "Sinkers", "Floaters" and "Hunters" that Carl Sagan and Edwin Salpeter of Cornell conceived of - as possible life forms that might inhabit a gas giant. At the time they ...
26
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24answers
9k views

Elf-like race: What could prevent overpopulation?

For an elf-like race whose people do not age beyond physical maturity (the accumulated DNA damage associated with aging does not occur), what would prevent overpopulation? This elf-like race is ...
4
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3answers
85 views

Electrolysis Assisted Aerobic Organisms [closed]

Hi this is my 2nd question on the site and I hope it is intriguing to you all. My question is: How feasible is it for an organism to sustain an Aerobic lifestyle (ie. the standard oxygen cycle found ...
5
votes
5answers
729 views

Why would a species require multiple inseminations in order to reproduce?

The Eldar are a psychic species with a similar body design to humanity within a galaxy-wide empire. They are far more advanced than other races, technologically and philosophically. Eldar have a ...
2
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3answers
826 views

Possible biological adaptations to make current humans more suited to surviving on Earth-like primitive planets? [closed]

Premise My alternate version of the human race has progressed just to the brink of the ability to explore and possibly colonize other earth like exo-planets. the story follows an expedition crew has ...
4
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5answers
207 views

Best place on an humanoid body to develop biological radio?

As seen on others questions biological radio could be a thing. How to evolve biological radios? What would a species require to be able to inherently transmit and receive radio waves? I was ...
3
votes
1answer
156 views

Would it be possible for an animal to develop pneumatic muscles through evolution? [closed]

I have been pondering the question of how make animals stronger in unusual ways. It was during this process that it occurred to me: "Can living things naturally develop pneumatic muscle systems?" For ...
5
votes
3answers
143 views

Is it possible to create light emitting creatures using selective breeding?

Suppose I take a group of alligators select the ones that emit the highest frequency of radiation (since all living creatures emit thermal radiation), and I breed those, and get rid of the rest and ...
4
votes
2answers
142 views

How would plants evolve with longer days?

(First post on StackExchange, hello world!) The project that I'm currently working on involves a Binary Planet system, both with life, although I'm only focusing on one. This planet has a climate ...
1
vote
1answer
140 views

I Need Help With Human Degenerative Disease (HDD) [closed]

I am currently working on a post-apocalyptic world where roughly 90% of humanity get infected by HDD (Human Degenerative Disease). HDD causes the human brain, glands and tissues to change quite ...
4
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6answers
172 views

Interplanetary/Interstellar World Blight

I have a bacterial organism called the "World Blight" this creature's life cycle revolves around being introduced to a new planet, spreading across the planet and terraforming it to its liking, and ...
7
votes
10answers
265 views

Plausible reasons for multiple hot seasons in one solar year

Setup: A planet generally with an earthlike climate, although slightly wetter and warmer as a general rule, with a little more oxygen in the atmosphere, but habitable by unmodified humans. Still has ...
16
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5answers
2k views

Would carbon-based lifeforms be able to eat silicon-based lifeforms?

In the South Galaxy, the overwhelming majority of life lives on planets, breathes air, and is carbon-based. All sentient life is carbon-based. However, in the vast reaches of space, there are some ...
11
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7answers
2k views

Sentient Cephalopods in Exoskeletons

On a distant planet covered mostly by water a species of highly intelligence cephalopods have evolved and even developed space travel. The problem? Most other species are land dwellers and the ...
8
votes
2answers
176 views

What could be used as an alternative to ATP in boron based biochemistry?

I have created a life form that is based on the element boron. As a substitute for DNA it instead uses Diborane as a building block. I've come across a problem however that I can't seem to get around. ...
10
votes
3answers
123 views

Chemical process for a radiosynthetic Ganymedian organism?

I'm trying to build an underwater ecosystem under the ice crust of Ganymede. I know Jupiter emits a large amount of ionizing radiation and synchotrons and thought that would maybe be able to replace ...
9
votes
2answers
167 views

What are the uses of colour in a world where nothing can see?

In a previous question - How might kinetosynthesizing "plants" look? - I introduced a worldbuilding thought experiment of mine centered around a habitable moon, heated by tidal forces, which ...
1
vote
0answers
85 views

Internal Body Heat of Giant Animals. At which point would their size cook them from inside? [closed]

It is my understanding that one of the reasons for why massive lifeforms (as depicted in fiction) aren't possible is the fact that the heat radiated by their body after a certain point would be too ...
8
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4answers
566 views

Speaking three sentences at the same time?

TL;DR - I want my angelic race to have the ability to speak in a way in which up to three sentences are communicated at the same time. (Assume English for the sake of simplicity. I want physiology ...
5
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2answers
112 views

Pangenesis and alien life

Darwin's hypothetical mechanism of inheritance was called pangenesis, whereby the body continually produced particles of information - gemmules - which aggregated in the gonads, and that that the ...
9
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3answers
253 views

Could humanoids without a skeleton be viable?

It's tempting to think that anything with the outer shape of a human would simply collapse in a heap if its skeleton were not there. That is surely true if the internal structure was the same as ours ...
7
votes
3answers
228 views

What would be the usefulness of both arms and fins on a sea dwelling, amphibious organism?

I am currently designing a highly intelligent species for a sci-fi project I am working on. They are quite similar physically to prehistoric salamanders or similar amphibians, but I am having trouble ...
7
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3answers
303 views

How plausible is a civilization, or life, that perceives time in reverse?

Humanity, with modern science, has established that the Big Bang happened 13.8 billion years ago. The universe appeared in a low-entropy state, and for billions of years has been expanding and moving ...
5
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2answers
138 views

Do these plants make sense in the way I want them to establish in my world?

(Beforehand I'll excuse myself for my english. If you didn't need to know that you can just ignore it) There's a network of root-like life forms in the top layers of my planet. They use some kind of ...
2
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4answers
161 views

Can I make the carbon cycle shorter - by metamorphosis from plant to animal and vice-versa

EDITED to address the above suggestion. See below. Most animals breathe in oxygen and breathe out carbon-dioxide. Most plants take in carbon-dioxide and release oxygen. Waste products from animals ...
2
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0answers
61 views

blood chemistry of blue-skinned elven race [closed]

If you were to discover blue-skinned humanoids, whose blue blood is bioluminescent turquoise blue, based on silver colloid, could one use the idea that they are germanium based lifeforms? Would ...
6
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1answer
218 views

How would endo-skeletal systems adapt to the atmospheric pressures given?

Surface gravity: 1G Info regarding of altitude, pressure, and atmospheric density: ...
1
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1answer
183 views

Near spherical alien species - How can they move?

The setting On an Earth-like planet but with completely different flora and fauna there is the Great Plain. It is similar in size to the Serengeti National Park on Earth. The Plain is surrounded by ...
5
votes
3answers
178 views

Digestive System Within Limbs

This one might be a bit weird, but here it goes... In designing the evolutionary history of my world, I've devised an evolutionary branch of animals adapting to terrestrial environments. Lacking rear ...
6
votes
3answers
343 views

Potential adaptions / features for life adapted to the level of atmospheric pressure given?

Atmospheric composition: | 2% Trace gases | 58% Nitrogen | 26% Oxygen | 11% Argon | 3% Carbon dioxide | Average surface temperature: 36 degrees Celsius Surface gravity: 1.36x Earth gravity ...
22
votes
7answers
2k views

An animal that is physically separated into multiple parts

One of my fictional planets (which is largely terran in nature) is notable for an unique animal. Said animal is a dangerous predator that is notable for several things: It is physically separated ...
17
votes
17answers
6k views

Swimming in space. What is the mechanism?

A large (compared to Earth life) species of creatures live in space. They gain energy from interstellar dust and starlight. How they do this is a separate question so not relevant here. However they ...
3
votes
6answers
153 views

Extremely heterogeneous life

All life on Earth is surprisingly homogeneous from a biochemical point of view. Every organism known to us is primarily built with carbon-based molecules that also contain hydrogen and oxygen, mainly ...
7
votes
5answers
312 views

Is it possible for a terrestrial creature to generate lightning?

Question Context: I've been developing insect-looking bipeds that have evolved on a mostly jungle/ocean planet in addition to small, scattered grasslands. This is justified (from what I've read) by a ...
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vote
1answer
141 views

How humans could establish a colony on this planet? [closed]

Yesterday I created an exoplanet on Space Engine, and then started to imagine how life could be possible on that little rock. I started to think about bacterial cells / archaea, anaerobic organisms ...
6
votes
1answer
740 views

Anatomically Correct Triskelion

Triskeles are popular Celtic decorative motifs. Everyone from modern day retro-Pagans to jewelry makers to Celtic bands uses them for the cool factor. But there is a little known creature, possibly ...