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Questions tagged [life]

For questions about the characteristics of living beings in different settings. This tag is not for questions about the daily life of characters.

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4 votes
6 answers
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Is a desert planet with a small habitable area possible?

My world takes place on a desert planet, but there is a small habitable forest with water and life. My main inspiration for this is Halem'no from star trek, but without a weather tower sustaining the ...
Breadsauce4's user avatar
4 votes
3 answers
915 views

Could we have a humanoid life-form that requires CO₂?

How would an heterotroph alien life form exist if it purely needed to inhale CO₂? Would it be lazier and bulkier that carbon based life forms who require oxygen, like us humans? I am trying to ...
XRK's user avatar
  • 49
3 votes
2 answers
235 views

What is the maximum survivable gravity for humans for say 8 months

I know the human body can survive multiple g's for short periods - like fighter pilots or F1 drivers. But what is maximum survivable gravity for more than just a transient moment? Could a body live on ...
Spang Mcbumbum's user avatar
4 votes
2 answers
381 views

Could a civilization have existed on earth when our planet was much smaller, and as earth gained more size could it have grew around and above them? [closed]

I want to create a civilization that were living on earth when the planet was a much smaller protoplanet or a planetesimal. If earth grew over billions of years, could a civilization have existed ...
Traline DèMon Spencer's user avatar
0 votes
0 answers
21 views

Regarding silicon-based life, how would using silane instead of silicone in chemical compounds change how the lifeform works? [duplicate]

All I currently know is that they require cryogenic solvents, cold temperatures, hydrogen to breathe, and only inhale. What else should I know for using silane in silicon lifeforms?
484is22squared's user avatar
6 votes
3 answers
310 views

Can a planet with rings support life?

Is it at all possible for complex life to evolve and exist on a planet with rings? I assume the rings would have to be rock, since if the planet is to support life, it will have to be in the habitable ...
mza's user avatar
  • 161
4 votes
1 answer
94 views

Could a planet with an unusually high heavy metal content sustain life? [closed]

I'm playing around with the concept of a planet containing unusually high heavy metal content, due to being born in a nebula that resulted from a neutron star merger. What conditions would this planet ...
Ellie Cressy's user avatar
29 votes
22 answers
7k views

Is it possible to live without killing?

Hooray! Aliens are discovered, the alien community is out there, and we want to join them. However to join their illustrious organisation, the Galactic Federation, it is a deeply moral group, and the ...
flox's user avatar
  • 22.4k
5 votes
2 answers
228 views

Life in the vacuum of space: What if we looked in the wrong places?

Forget space whales, forget star-trek-style creatures like the crystal entity, forget space creatures so massive that they have their gravity to hold on to an atmosphere around them. The issue with ...
Christmas Snow's user avatar
3 votes
1 answer
508 views

Planet orbiting a star orbiting a black hole - can there be life?

Sagittarius A* is a black hole at the center of the Milky Way with at least 45 stars orbiting it. It weighs in at over 4.2 million solar masses and is likely rotating, which has interesting effects on ...
controlgroup's user avatar
  • 5,415
10 votes
7 answers
3k views

Could Megaflora Sustain Permanent Settlements?

So, a setting I'm brainstorming is basically a tribal world, with Hunter-gatherers, animism, and the like. One of the features I want to add, to make it stand out from our own world is the existence ...
Knight_of_the Order_of_Pizza's user avatar
4 votes
1 answer
146 views

Gas giant ecologies with more realistic weather. Sky anchors

I've always enjoyed stories that explore ideas about life in the clouds of gas giants. The Algebraist by Banks is my favorite. Though one thing that never quite rang true to me about stories like The ...
futurebird's user avatar
  • 1,029
5 votes
1 answer
1k views

Must a planet's magnetic poles be coaxial with the axis of rotation?

I have this idea for a planet whose magnetic field is not aligned with the axis of rotation as is the case for Earth (I know they're not exactly aligned, but hear me out). How plausible is this, and ...
user avatar
14 votes
15 answers
5k views

Could there be an alien life form (a complex animal) that lives hundreds of thousands of years, or even millions of years?

On earth, most animals live decades, and only a handful over 100 years. What has led to such a 'short' lifespan across the board? Assuming there may be other carbon-based life forms similar to that of ...
Sach's user avatar
  • 888
7 votes
4 answers
667 views

Could two planets located in the habitable zone create life and in turn intelligent life around the same time?

I have two planets located in the habitable zone of a 1.02-mass Star(Class: G1.7V). The first planet is located 1 AU away from the Star and the Sun is 1.08 times brighter than our sun to anyone on the ...
Martamo's user avatar
  • 976
8 votes
5 answers
4k views

Would My Planet’s Blue Sun Kill Earth-Life?

I’m creating an Earth-like world where the sun appears blue to people from the planet’s surface. I think I’ve narrowed down the cause of this effect to the presence of 1 micron particles in the ...
Kal Madda's user avatar
  • 1,851
15 votes
1 answer
2k views

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 ...
Murphy L.'s user avatar
  • 1,341
2 votes
1 answer
146 views

How can I make my insect life cycle time system more accurate

In my world, there is not day or night, only dusk and dawn. Their time system is based on an insect called an Ersen which follows a very mechanical and strict life cycle which is synchronised ...
NEWWORLDBUILDER's user avatar
1 vote
2 answers
115 views

Would this unorthodox planet be habitable by carbon based life forms?

While researching volcanoes, it’s very clear super-volcanic eruptions are not only dangerous to life in its vicinity, but the entire planet as it can decrease global temperature and cause long periods ...
HomegrownPotatoes's user avatar
3 votes
1 answer
169 views

Could this animal exist on my planet

Im working on a project where I'm designing a theoretically possible planet with life and I had an idea for a massive sea animal (500-550 meters in length). Water animals get help from buoyancy but ...
RHMSstudent's user avatar
2 votes
3 answers
323 views

What adaptations would be needed for life and water around a blue star?

Of course it's very obvious that blue stars are insanely hot and would boil away most things if they got too close. BUT I'm curious if with just the right adaptations and fiddling, could there, ...
Thunderhammer's user avatar
9 votes
1 answer
283 views

Could a planet support life if its only energy came from antimatter striking its atmosphere?

This planet is a rogue planet without any star or without being volcanically active. Antimatter continually collides with the planet, and annihilates with hydrogen in the upper atmosphere. This ...
Prime Price's user avatar
0 votes
4 answers
366 views

Fire Planet as a light/heat source for my planets

So, basically, I was looking for a alternate light/heat source for my science-fiction novel which I am planning to write. I didn't rely on stars due to some reasons that I omitted from the original ...
Alastor's user avatar
  • 3,422
6 votes
3 answers
1k views

Could an ecosystem exist where no rain falls (only snow and ice)?

I am trying to create a boreal, alien ecosystem loosely based on Northern Siberia. Liquid rain never falls here, since snow and hail fall instead for most of the year, and the short, hot summers- the ...
Mark Price's user avatar
  • 2,438
9 votes
4 answers
511 views

Could a moon of Epsilon Eridani b Have Surface Oceans of Liquid Water?

Specifically, the gas giant Epsilon Eridani b, and a moon that has a mass of ≥0.25 Me. If there's no feasible way the moon could have oceans at a distance of 3.52 AU from a star that emits 0.34 times ...
isdi0's user avatar
  • 401
7 votes
9 answers
2k views

Why is overpopulation not an issue on a floating island where people can live for a long time

In my setting there are large floating islands and much smaller floating islands that flow in random directions. Smaller ones sometimes contain mini ecosystems or ore veins that are extremely useful ...
FIRES_ICE's user avatar
  • 3,143
3 votes
1 answer
111 views

Organic reactions in alien peat [closed]

So imagine there's a peat composed of a mixture of partially decomposed polypropylene and polyethylene. Another girl and I worked out the reactions for polyethylene and its decomposition byproducts, ...
edzatle's user avatar
  • 41
5 votes
2 answers
198 views

Superactinide Incorporating Biochemistry

Alright so as it is known, trans-uranic elements are universally unstable. However, in this setting, I'm using forms of quark matter that can imitate the nucleus of transuranic elements at least mass ...
Cease Desist's user avatar
0 votes
4 answers
285 views

Could a planet be cut in half and still sustain life? [closed]

Say some sort of anti-planet weapon shoots an arc of energy slicing the planet in 2, could the said planet keep it’s atmosphere and life.
Blue Skin and Glowing Red Eyes's user avatar
1 vote
0 answers
83 views

Underwater life on a 3G world [closed]

I'm creating a 3G ocean world and am wondering how the heavier gravity would affect life under this ocean?
David Spangler's user avatar
7 votes
5 answers
590 views

What evolutionary driver could produce life that are animated only by light?

Imagine an alien world populated by silicon based lifeforms, the mega fauna can only be animated by exposure to adequate lights from the star or the moon. This world concept is inspired by a ...
user6760's user avatar
  • 48k
4 votes
2 answers
1k views

Existence of life using sulfur instead of oxygen

All life on earth (or at least most of them) require oxygen, at least to form the organic molecules that build up life. We know that sulfur has similar chemical properties. Organic compounds that ...
user avatar
3 votes
1 answer
156 views

Darkness on a hycean world

Hycean worlds are planets twice as big as earth and covered in water oceans and with atmosphere full of hydrogen. A dark hycean world is one such world tidally locked to a star with one side forever ...
Joe Smith's user avatar
  • 3,192
3 votes
1 answer
72 views

Plants or something else that enriches distilled water

I'm writing a story in a world very similar to our Earth, but with few differences. In this world, the "human" beings have to deal with the shortage of drinkable water. But they have plenty ...
Mark's user avatar
  • 141
-4 votes
2 answers
178 views

Reasons why a sentient universe would create life? [closed]

The basic idea I had was that the universe basically thought itself into being and from there decided to create life. It sent out the seeds for life to begin, then created a race to watch over things. ...
Micromanic's user avatar
7 votes
3 answers
525 views

Biological siege weapons: Part 2 - Can a living thing effectively perform the role of ranged siege weaponry such as trebuchets?

As was pointed out by the great answers of my first question regarding biological siege weapons, organisms can be rather capable of making it through fortified defenses at close range, but what about ...
Rubrikon's user avatar
  • 1,483
15 votes
15 answers
3k views

Biological siege weapons: Part 1 - Are living things capable of breaking down the gates of a medieval gatehouse?

The setting features biomancers who, to summarize, are magic users who can create living things as minions or servants through various ways(seeds, modified eggs, whatever), have the option to directly ...
Rubrikon's user avatar
  • 1,483
7 votes
1 answer
175 views

How big of a reactor a colony of a million should have for self sustaining, closed loop existance, assuming current level of technologies [duplicate]

Suppose there is no sun, how much total energy is required to grow food, recycle air, water, and waste for a single person. I want to know how large of a reactor would be needed to keep alive a ...
Adam Kabbeke's user avatar
  • 1,973
0 votes
2 answers
127 views

Would soil alone be able to provide everything that's needed to feed the development of an animal body without in-between edibles?

The setting features biomancers, mages who are like necromancers in that their magic revolves mainly around the use and obtaining or creation of minions or servants or the modification of said ...
Rubrikon's user avatar
  • 1,483
5 votes
3 answers
1k views

What if all life disappeared from the earth?

What if all life (plants, animals, bacteria, fungi, and everything from the smallest cell to the largest whale) disappeared instantly? And here I don't mean things related to the disappearance of ...
Bowman's user avatar
  • 619
1 vote
4 answers
2k views

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 ...
Rubrikon's user avatar
  • 1,483
2 votes
4 answers
750 views

Too much oxygen and not enough carbon

If a planet has a lot of oxygen to support mega flora and fauna, how much would be too much? My planet has the oxygen content about that of the carboniferous(as a starter example), which had a about ...
Erik Sanchez's user avatar
-2 votes
1 answer
124 views

Indicators of Ai Super Intelligence [closed]

Given the certain state of Ai, what indicators would show some level of ‘Super Intelligence’? Here are some of my ideas of 'Super Intelligence' this is subjective, of course. Able to operate on ...
Xammax's user avatar
  • 9
5 votes
4 answers
212 views

Realistic reverse aging?

More than a few times in fiction they've had a sentient species age in reverse, as in the children look like adults and the adults like little children. My question is how could this trait be ...
Joe Smith's user avatar
  • 3,192
2 votes
1 answer
230 views

Biosolvents for Life

What biosolvents could, in theory, permit the emergence of life on other worlds? I have been recently looking through possible biosolvents and I have found a good number, but I am specifically looking ...
Kyler Rusin's user avatar
0 votes
1 answer
115 views

Synthetic hydro carbon based Life

This question includes Genuine Artificial intelligence as life so long as it is self replicating and sapient. Hard science only please. Can a sapient self replicating entity be designed to exclusively ...
Vladimir Silver's user avatar
3 votes
1 answer
181 views

Scientific explanation for rainbow fire or sparks from a biological entity

I recently re-watched guardians of the galaxy vol.2, and the creature at the beginning could shoot rainbow colored fire. This got me thinking, (as in my spare time sometimes I like to just write a ...
Alyx's user avatar
  • 31
1 vote
2 answers
174 views

Would this planet be habitable for intelligent lifeforms

I am trying to make a universe using math and this is a planet from the first solar system I am making. Firstly the star. This star, which I don't have a name for, has a mass of 1.3 solar masses, a ...
TheCreator's user avatar
3 votes
6 answers
4k views

How long can a vampire live?

Okay, say I have a castle with a single vampire living in it. They need to drink the blood of 5 humans per day to survive, but they can substitute with animal blood, or by taking small amounts from ...
TysonDennis's user avatar
  • 2,380
4 votes
1 answer
283 views

How would the ocean smell if there were no life in it?

My characters are on a planet with no life that somehow has a weakly breathable atmosphere. They're on a beach and they note the smell. This is salt water so maybe the smell is different from, say, a ...
MackTuesday's user avatar