All Questions
Tagged with planets xenobiology
82 questions
3
votes
3
answers
359
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Biology of a Planet Sized Lifeform [closed]
This is also part of the sci-fi thing I'm working on, a planet sized lifeform.
The planet sized biological creature belongs to the "Ancestral Elves" species, and is also the capital planet ...
- 155
14
votes
8
answers
3k
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How can life which cannot live on the surface of a planet naturally reach the supermajority of the planet's caves?
I want to create a setting focusing on a planet where nearly all complex macroscopic life lives underground, but I keep running into a problem: If a complex organism is adapted to cave life to such a ...
- 2,242
13
votes
10
answers
4k
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How much time is needed to judge an Earth-like planet to be safe?
A colony ship has been sent to deep space to colonize an earth-like planet. Through astronomical spectroscopy, the atmospheric composition was found to be suitable for human life. But of course, ...
- 1,023
3
votes
1
answer
174
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Could a biological organism power itself with electricity like a smartphone (or something similar)?
Imagine an alien world where there are are shallow lakes where electricity generating beings (like electric eels or whatever) would power many of the land dwelling creatures, including the dominant ...
- 1,019
2
votes
1
answer
114
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Life in the core of a rocky planet
Background
First of all, I’d like to state that I know the entire premise of this question is hypothetical and the life probably quite unlikely to form in the first place at best. Despite that, I’d ...
- 1,550
13
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6
answers
3k
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Minimum amount of land a planet can have and still be habitable?
I read in a paper, posted by L.Dutch, that:
It turns out that water worlds may be some of the worst places to look for living things. One study presented at the meeting shows how a planet covered in ...
- 589
6
votes
3
answers
382
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Plausibility of life emerging and evolving on gas giant moons?
I have been working on the setting for a hard speculative biology/evolution project that for now will simply be referred to as the Gemini Project, and the main issue I've been having is whether or not ...
- 511
2
votes
3
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225
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Could a planet 2 times the mass of earth have floating organisms in its skies
Can a planet 2 times the mass of earth have floating animals in its skys? I watched the netflix documentary series ailen world's and one of the exoplanets atlas was high gravity but was very dense so ...
1
vote
0
answers
198
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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 ...
- 11
15
votes
1
answer
2k
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On a planet with larger gravity, would aquatic creatures be larger or smaller?
It is somewhat common knowledge in the worldbuilding community that larger planets leads to smaller land creatures, because larger planets means more gravity gets bigger and that makes it harder to ...
- 1,351
10
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2
answers
337
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A planet with acid rains but its atmosphere is breathable
I am trying to create a planet that rains acid, and that has acidic oceans of water, but a breathable nitrogen-oxygen atmosphere.
This planet has native lifeforms that have evolved to withstand these ...
- 147
6
votes
7
answers
1k
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How did the vast nexus of hollows, caves and a thriving underworld on this alien planet come to be?
I had a unique idea for an alien planet. The surface would be snow-capped mountains and glacial fields, it's cold and essentially devoid of most life. But just underneath the towering mountains ...
- 2,333
10
votes
8
answers
4k
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Life underneath a blue star
Blue stars are notorious for burning too bright and living too briefly for life to develop around them. But is there some way that life could survive long enough to reach the sentience stage? I'm ...
- 3,202
3
votes
3
answers
293
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If we accidentally spread microorganisms to other planets in our solar system, could they evolve into complex life?
Is the following story plausible: a spacecraft transports microorganisms from Earth to another planet or moon in our solar system. Those microorganisms survive, and eventually, evolve into complex ...
- 133
8
votes
3
answers
272
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Surviving a dark hycean world
A dark hycean world is supposed to be a hot water world with a thick atmosphere around a red dwarf star. This means it's tidally locked with one side forever facing the sun and the other forever ...
- 3,202
4
votes
3
answers
443
views
How Can a High Gravity Planet Have a Magnetic Field
We all like life forms from high gravity planets, it’s a popular Sci fi trope and one that I love to play around with. It’s fascinating to try and designs creatures for an environment that would ...
- 2,333
6
votes
2
answers
188
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How can I get mostly-hydrogen-sulfide seas (with lifeforms in them)?
The lifeforms don't have to use hydrogen sulfide as a solvent. Maybe they've got an internal water-ammonia eutectic mixture or something; anyway, it doesn't matter. The point is, I want an ocean of ...
- 42.7k
2
votes
2
answers
373
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How colorful would plants and animals in a habitable planet orbiting a F main sequence star would be?
F main sequence stars are hotter and brighter than the Sun and therefore they emit more UV radiation than sun-like stars. Many scientists think that complex life could develop in planets orbiting such ...
- 1,899
4
votes
1
answer
262
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What kind of world could produce polyoxometallate life?
There has been some cool work in synthetic life to produce cells based on polyoxometalate ions, certain metal oxide complexes have been shown to have autocatalytic behavior, and heteropolymetalate ...
- 42.7k
4
votes
2
answers
237
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How would plants obtain helium on an earth-like planet?
My question is how would plants obtain helium in land?, mainly for floating in a high surface pressure atmosphere (maybe around 1.5 atm?), or at least its seeds or tiny parts of them, also it is ...
9
votes
1
answer
2k
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Could a planet with 0.9 Surface gravity retain this atmosphere?
I have a planet with a surface gravity of 0.9 times that of Earth, and an escape velocity of 11.3 km/s, and a temperature like Earth's. My question is if it could retain a breathable atmosphere (for ...
4
votes
2
answers
295
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Low G vs High G planets and floating species
So, i want to make a planet with these requirements:
A higher surface pressure than earth, and an atmosphere that could last long enough for intelligent life to appear.
(If possible), medium or large ...
4
votes
6
answers
628
views
How to make an Old Solar System planet Venus scientifically possible?
The "Old Solar System" is our solar system as described in many space operas and planetary romances written before the space age.
https://www.solarsystemheritage.com/
In stories in the Old ...
- 31k
1
vote
2
answers
72
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Life present on earth-like habitable exo-planet
Scientists are looking for an earth-like habitable exo planet. If an exo planet is earth-like (in terms of gravity, atmosphere, light, water etc.), then it must have gone through an evolution process (...
- 5,631
2
votes
5
answers
272
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Are there things that can make natural lifespan in other planets inherently longer?
How would things like gravity, air composition and density affect the lifespan of the biological protein based life that inhabits the planet, or would they have any significant effect at all?
Honestly ...
- 383
6
votes
2
answers
2k
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Methane-Breathing Animal?
In my story, Saturn’s moon Titan’s methane lakes are inhabited by microorganisms that photosynthesize, converting hydrogen into methane (A process thought possible on Titan after some study). This ...
- 581
2
votes
2
answers
200
views
Electricity-powered life on an ice planet?
I imagine that in a nearly Earth-sized ice planet with an atmosphere similar to that of earth, life has been able to proliferate.
It first formed in the oceans below the ice, which are warm enough for ...
- 723
1
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4
answers
2k
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Is an almost entirely water-based planet stable enough to stay as a planet for long enough for complex life to form?
Imagine an earth mass that consists purely and entirely of water that orbits a star similar to ours at a similar orbital distance to Mars(or whatever distance would be sufficient for the planet to ...
- 1,483
1
vote
2
answers
142
views
Traits of an intelligent & civilized species that lives under a red dwarf star?
More details -- their planet is very bigger than Earth, has stronger gravity than Earth's, it has 2 moons, it's not tidally locked, and they're supposed to have evolved from social obligate carnivore ...
- 905
-2
votes
1
answer
90
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Alternative biology/Xenoforming 3:any ideas how to xenoform Mars? [closed]
So i have an idea of an super advanced being that travels around the galaxy and spreads life on every planet that has any potential for it.By "life"i do not mean only "Carbon based"...
- 1,019
6
votes
1
answer
349
views
Alternate Biology/Xenoforming:Could the moon have a Chlorine atmosphere?
So I have this idea that a super advanced being travels across the galaxy and is terraforming/xenoforming every planet that CAN be modified for life, not just Carbon based Earthlike lifeforms but ...
- 1,019
8
votes
9
answers
2k
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Is a planet sized creature possible?
Now, I have started working on a game called In The Flesh, and I have decided to use this site to work on it.
The Game Itself
In any case, the main idea of In The Flesh is that it's a sci-fi ...
- 83
1
vote
1
answer
379
views
Changes to water worlds to make them habitable
What changes/additions/deletions, large or small, minimum handwavium allowed, would be needed to make suspected water covered exo-planets such as Gliese 1214 b, Kepler-22b, Kepler-62e, and Kepler-62f, ...
- 4,948
6
votes
1
answer
244
views
Oceans of breathable liquid
I want to create a locale (hopefully a whole planet?), where the ocean is breathable. I was looking at perfluorocarbons, so the liquid part is at least possible(?)
Is there any way to create a world ...
- 4,948
2
votes
1
answer
166
views
What color would plants be on a hot spring planet? [duplicate]
I had an idea for an alien world I want to set a story on and if this question proves popular I might ask other questions regarding this world.
The world in question is an earth like moon orbiting a ...
- 2,333
4
votes
2
answers
338
views
A bacterial organism that survives on the surface of Venus
Yes, you read the title right.
Naturally this cannot be DNA/RNA based, the highest temperature organisms have survived as we know it is 122 degrees celsius and Venus surface is 4 times hotter on ...
- 1,048
2
votes
1
answer
156
views
What would Martian Life be like? [closed]
Basically what I'm asking is how would hypothetical life be able to survive on Mars? Would they need to be created from scratch in some effort to make life on seemingly uninhabitable worlds or ...
3
votes
4
answers
209
views
High energy, low temperature?
Alien spacecraft have entered orbit around Earth. They have launched a few probes for closer observations, but made no attempt to land. Figuring out meaningful communication is an ongoing process, but ...
- 42.7k
3
votes
4
answers
110
views
Earth-sized Moon with Host Planet launched from Star System
Could a planet with the size and characteristics of the Earth orbit a gas giant and would the earth-like moon be able to maintain its orbit if the gas giant went rogue and was launched from its host ...
- 31
5
votes
3
answers
203
views
Can a perpetually darkening atmosphere exist and yet still allow life to evolve?
I am creating a science fiction worldbuilding project, in which humanity has colonised distant exoplanets. One such planet is a Venus-like planet in the sense that it has a perpetual cloud cover, ...
- 170
5
votes
2
answers
480
views
Would a life-bearing Earth-like world with 3g average gravity produce more or fewer flying creatures than Earth?
On one hand, heavier gravity would make flying more difficult, owing to greater weight restrictions on the flying creatures' bodies.
On the other hand, the greater density of the atmosphere on our ...
- 491
16
votes
13
answers
2k
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How did aliens on a habitable planet hide themselves during the recon and scouting stage by human colonists?
We've found a habitable planet orbiting a red dwarf star some light years away and conditions are Earth-like enough that a colonization project was initiated. Before any humans landed on the planet, a ...
- 1,463
1
vote
1
answer
108
views
Lifespan of Plutonians [closed]
Honestly, I think my questions about a fictional Pluto are by far the interesting to me, so I have another question.
Now that I’ve got my humanoids pinned down, and what protects them from the cold, ...
- 1,173
6
votes
3
answers
496
views
Is this Martian creature plausible?
I am thinking of writing a story about a Martian civilization. It might involve humans, but, I think it will be more interesting if there are creatures adapted to the Martian lifestyle as well. So, ...
- 4,165
9
votes
2
answers
2k
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How would oceans of supercritical CO2 on Venus-like exoplanets look like/behave?
Carbon dioxide turns supercritical above a pressure of 73 atm and 304.25 K (31.10 °C). The surface of Venus fullfils these conditions.
The density of the air at the surface is 67 kg/m3, which is 6....
- 17.2k
4
votes
2
answers
894
views
Adaptations for an ice planet?
My planet is a frozen world. Roughly the size of earth and in a perpetual ice age. The planet has very cold temperatures at night and during the day its surface becomes very bright. The intense solar ...
user69494
6
votes
4
answers
714
views
Cool way to see through fog and darkness
My planet is frequently set with thick fog. What is the best way to have its residents see accurately?
One species called Hell Fires fall from the sky, landing on top of prey and killing it. How ...
- 620
1
vote
2
answers
377
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How would a very old biosphere differ from Earth's "young" one?
On my world, the equivalent of the Cambrian/Avalon explosion happened 5 byr (2 byr after formation) ago as opposed to 0.5 byr ago on Earth.
The planets rough parameters are:
mass between 0.4 and 0....
- 17.2k
3
votes
2
answers
319
views
Would advanced Plantoids be plausible? [closed]
Could it be plausible that if enough time given and favorable conditions are met, the dominant species of an alien planet could be a species of plant and by dominant I mean achieving sentience and ...
- 1,586
2
votes
0
answers
224
views
Planet builder? [closed]
I've got questions I haven't been able to get a grip on for two different planets.
One has its axis at about 90deg (like Uranus), with day & year like Venus (day longer than year), orbiting a ...
- 193