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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What would happen if all of us earth dwellers leave to live in space? How would the society function there? [closed]

Suppose we invent a spaceship technology that could keep us alive for hundreds of years in space and all of us afford to buy one "Jupiter" just like in the "Lost in Space" series, how could society ...
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1answer
59 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, ...
2
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5answers
121 views

In what way would a regenerating undead be “undead”?

We all know an undead is a reanimated corpse, something rotten and decomposing yet still animated. Normally an undead (if made of flesh) will have an expiration date after which it won't be able to ...
9
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2answers
116 views

Could life generate twice on a planet using slightly different materials?

Extremely low possibility, but if life synthesizes from scratch after life has existed on a planet for a few million years, would the two separate lineages be able to co-exist?
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12answers
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Habitable Planet with Highly Eliptical Orbit

Would it be possible for life to develop on a planet with a highly elliptical orbit? (Similar to a comet, but possibly less extreme.) If so, what conditions would be necessary and what would the life ...
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2answers
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Could bacteria survive on a star?

If the right requirements are met, could bacteria survive on the Sun? The bacteria would spend most of their time in hibernation and reproducing, and when the time comes, they spread out on plasma ...
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3answers
178 views

Living machines. At which point can machines be considered a life form or organic?

I found this definition of life. Life is a thing that can adapt to its environment, grow and replicate. But mechanical, electrical, and electro-mechanical machines are never called alive. People ...
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2answers
148 views

What would life be if humans had a healing factor? [closed]

The main premise is that since homo sapiens evolved, humanity has possessed a healing factor similar to wolverine, but lesser. How would modern-day life be different?
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1answer
59 views

I'm building a fantasy world with three large moons and orbiting a distant sun. I need help with the following: [closed]

1 - What might the days and nights be like, in terms of comparative temperatures and length, with three moons gravity and a massive orbit?
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3answers
160 views

Reason/Mechanism for seemingly randomly lengthened lifespans in characters in a roughly viking-age world

So here's the deal. I'm working with the idea that in my world, people can have very different lifespans. Most people live a normal lifespan - the book is set in a fantasy world roughly equivalent to ...
5
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1answer
122 views

Plausibility of Hexapodal Aerial Megafauna

How plausible is a six-limbed flying animal roughly the size of hatzegopteryx to be aerial? In this case, an aerial animal will be defined as a creature that solely inhabits the sky. I will call the ...
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2answers
110 views

How long until land life can return after the impact?

So, it finally happened. The Earth was hit by a comet, and anyone outside of a research station at the bottom of the Atlantic is now dead, or dying. So, here's what we need to know: How big would a ...
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2answers
173 views

Hanging World - Trees

Scenario A civilization is living on an ancient super structure, they don't know much about it, they just live there and have lived there for as long as they know. For our current situation we can ...
6
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1answer
90 views

Environment/Ecosystem for a “Sunfall” colony

I've read a lot of posts about moons around large gas giants and I think I have fairly good idea about basics to them. I'm not super great with all the science parts myself but they give me lots of ...
7
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2answers
251 views

If humans evolved on Mars instead of Earth, how quickly would we have detected life on Earth?

Suppose that both Earth and Mars was booming with life in a similar way. Except that, on Earth, there was no hominid family, and no humans evolved. Instead, humans evolved on Mars. Assuming we had ...
4
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2answers
191 views

How Would Ammonia-Based Life Evolve? [closed]

EDIT: The planet/moon has a high mass, and has a similar atmosphere to Jupiter or Saturn. These organisms will be silicon-ammonia based, and breathe hydrogen. There will be very little oxygen in the ...
7
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5answers
175 views

Adapting to a sonic world

A planet much like Earth orbits a star much like the Sun, but with one difference: the energy from the star is magically transformed into sound within the planet's atmosphere. There is no longer ...
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2answers
143 views

Algae using UV light from auroras for photosynthesis

I was reading some questions on Quora and I found this claim: The polar regions have a very odd reason for them to have so much oxygen production. You see the Polar aurora run day and night in the ...
6
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5answers
163 views

Planetary neighbors

Let's say there is another planet in our solar system that harbours sentient life and this sentient life can build castles, buildings, and other such structures. When would we notice that? We can ...
4
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1answer
129 views

How much of our solar system can you change without breaking the science of life on earth? [closed]

I am making a near-future setting that takes place in an alternate solar system that's similar to ours (one planet with life, a moon, and other planets without life and their associated moons). And ...
3
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3answers
138 views

Planet with two independent forms of life? [duplicate]

Suppose there is a planet fertilized with Earth-like life (characterized by proteins, nucleic acids, DNA, RNA) and a completely independent form of life, but also water and carbon based with different ...
4
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2answers
189 views

Born and raised on a world with longer days and years - would it impact life expectancy

If humans found a habitable world and access to it, what would the effects be of a longer day to those who were subsequently born and raised there? Is there any evidence that a longer day cycle (of ...
6
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1answer
183 views

How could a foam habitat support animal life?

Knowing foam is formed by trapping pockets of gas in a liquid or solid, what could a foam able to support life on an earth-like planet be made of? This foam ought to be stable enough and large enough ...
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6answers
199 views

Life on land, sea, and what else? [closed]

On earth there are two main media that support complex animal life. One is the sea, with creatures living both on the seabed and the water; Another is the land, with animals that live both on it and ...
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3answers
696 views

Appropriate liquid/solvent for life in my underground environment on Venus

Partly inspired by this question My Venusians are happy in their cloud top city when a small group somehow (with lots of handwaving) crashes to the surface, falls underground, and ends up in a hidden ...
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13answers
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How would fantasy dwarves exist, realistically? [duplicate]

I've never ever seen even a suggestion of an idea of how dwarves actually can live how they are most often depicted - underground without handwaving or magic (which is just a fancy word for "...
4
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1answer
140 views

Would life be possible on a planet that has an axis of rotation that always “pointed” directly at the sun? [duplicate]

Preface: I'll be calling call the orbit described in the question title a "solar-oriented orbit" for the sake of convenience, as "a planet that has an axis of rotation that always pointed directly at ...
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9answers
1k views

Realistic Necromancy? [closed]

In my fantasy world, necromancy exists and it is considered "evil". I try to base my world on science, so how would realistic necromancy work? Dead bodies decompose fast, and souls don't exist in my ...
3
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7answers
748 views

What items from the Roman-age tech-level could be used to deter all creatures from entering a small area?

Please assume the following: There is a item on the ground and I want nothing but bare earth touching it. I cannot move the item myself. The item is impervious to fire. I cannot afford to guard ...
11
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10answers
6k views

Is there enough fresh water in the world to eradicate the drinking water crisis?

Lets assume, by the means of some advanced scientific discovery, scientists find a way to teleport simple matter to any part of the world and use this process to teleport fresh water and/or small ...
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6answers
274 views

How can one manipulate elementary particles to make a person live forever?

Assuming that a person has the power to manipulate all elementary particles in any way (i.e. changing them from one elementary particle to another, nuclear transmutation, moving groups of them at a ...
2
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1answer
134 views

Life evolving on a artificial Floating Island on a ocean world [closed]

I'm having troubles with developing my ocean world. Same size as Earth, same atmosphere and gravity. The idea is that on a planet with an endless ocean with no continental landmass. The only form of ...
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2answers
119 views

How would gravity affect a torus-shaped planet? [duplicate]

My planet is a Super Earth about twice the mass of Earth. I'm not asking how it formed, although that would be nice to know. I mostly just want to know how long it would stay a torus shape, and how it ...
4
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2answers
160 views

Could fruit (specifically oranges) evolve into intelligent life? [closed]

Is it possible for oranges to become intelligent life while still retaining some of their essential qualities such as skin that can neatly be peeled off and reproduction through seeds and growth off ...
5
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3answers
220 views

How would a world evolve with regular blizzards? [closed]

Imagine there are severe magical blizzards coming from the south pole at regular intervals. Since they're magical, let's assume they can cross the equator and don't lose strength over time. They are ...
2
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2answers
177 views

How long a human being could live with stem cells?

I once saw an experiment with mice, where they connected the bloodstream of a younger mouse to the bloodstream of an older mouse. And the older mouse became "younger", or at least healthier. If I ...
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3answers
1k 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 ...
5
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1answer
644 views

Iron based life

Lately I have been thinking about possible forms of life on planets that would have radically different experiences than here on Earth. I was wondering if life based on transition metals was possible ...
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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 ...
6
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2answers
373 views

Planet Orbiting a Red Dwarf

I'm trying to create my planet orbiting a red dwarf, honestly I've thought other scenarios but it's like every answer opens new questions. I'll just say what I want my planet to be and I'd like your ...
3
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4answers
217 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 ...
4
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2answers
109 views

Planet Blob - variable gravity

On the planet Blob there is an unusual phenomenon. It is known to emanate from the planet's core but 2018-level scientists have no understanding of it. The phenomenon Gravity isn't constant. It ...
9
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1answer
3k views

What amount of forrest-fire in square km or metric tons, would be necesary to bring oxygen levels below 19.5% that humans require to stay alive? [closed]

I read that oxygen makes up 21% of the Earth's atmosphere. I'm guessing it would take a lot of burning to decrease that level, but I am not sure how to calculate that. The problem is: Roughly 400 ...
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6answers
4k views

If humans were biologically immortal, but had an average lifespan of 100 years, what would the distribution of ages be?

Let's say that humans were biologically immortal. Once they reach adulthood, they effectively stop aging. Due to disease though, the average lifespan is 100 years. (In practice, your access to ...
3
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1answer
131 views

Could this moon of a gas giant orbiting a neutron star support life?

Making the following assumptions: 1. The three moons of the Gas Giant are safe enough distances from and massive enough not to pull each other apart or send themselves careening into the void. 2. ...
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2answers
204 views

What would happen to us if animals, excluding human being, were mute? [closed]

Most of us live in big cities where we hear unnatural (mostly unpleasant) sounds, created by things we've made ourselves. We hear less natural sounds like birds' songs or other animals making sounds, ...
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3answers
155 views

If a human's lungs stretched to the lower abdomen, what would it feel like? [closed]

I was considering a human-like race of aliens, where their lungs are huge. Their lungs would reach to the lower abdomen. Due to the science-magic of the setting, they can survive just fine with ...
2
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1answer
124 views

What would happen if all (higher) life magically became sentient and reached human-level intelligence? [closed]

Overnight, all higher life, multicellular life forms from trees and grass to dogs and elephants reached a level of intelligence similar to that of humans. For example, they can communicate effectively,...
2
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3answers
324 views

Is it possible for humanoid life to develop on a 1.4 G planet?

I'm writing a JRPG-inspired novel set on a planet with 1.7 Earth masses and 1.4 Gs, but is it possible for life to even develop on such a high-gravity planet in the first place? I tried scouring the ...
0
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1answer
124 views

Live Body Preservation…A way to live for many centuries? [closed]

I was thinking that if there was a machine which preserved live human body without aging would that be a way/solution to live for many centuries? ex- A person at age 40 sleeps in that machine & ...