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Lets assume a city exists underground, either in natural caves or synthetic tunnels. Are there any food sources underground, and what kind of population can they support?
A lot of species on earth do not care for their offspring; they spawn thousands of eggs, that hatch into larvae, and then grow up towards full size. If a hypothetical species was sentient in the f...
I can easily set a story in a dystopian environment not subject to ethics, but I would rather try to create a backdrop that is as ethical as possible given the requirements. I feel that writing abo...
Suppose we have a civilisation which is made up of many creatures sharing a single hive mind. Each creature can see, hear and remember what each other member of the species (or possibly hive) has s...
Making things bigger or smaller is common in speculative fiction (giant ants, tiny people, planets bigger than stars, and stars smaller than light bulbs.) What general principles should be kept in...
My answer to the question Is there a scientifically sound faster-than-light travel system for a spaceship? involved an Alcubierre-drive starship. However, that then got me thinking. What would an ...
In series such as the Hyperion Cantos and Ender's Game, there exist fictional faster-than-light communication systems allowing either instantaneous, or near-instantaneous transmission of informatio...
Some Science fiction stories have generations growing up on Mars would be a lot taller 7'+. How would growing up on a much lower gravity planet affect a mammals size? I understand bone density wo...
In relation to this question, what would plants do if they were taken from their environment to another gravity level, in particular zero g. For example would the daisy manage to grow higher bec...
On Earth the planet's magnetic poles line up fairly well with the geographic poles. This makes things like navigation very straightforward as all compasses point to (roughly) the north pole. How...
This question is about big trees that can contain an entire city. So generally speaking: What limits a plant's size, anything from a tree to a flowering plant? What environment needs to exist f...
Would it be possible for a corporeal alien with a solid physical body (it must be able to touch and interact with the world) to exist but remain invisible to humans? My understanding of optics is...
I want two populations to coexist in a world with extensive tunnels carved into the rock. One population lives in the tunnels, coming out to trade and gather food. The other is aware of the tunnels...
I'm exploring this idea for a fantasy world, and I was wondering how these planets would affect each other. The system would feature orbits in all three dimensions, not relatively flat like ours is...
The grey goo end-of-the-world scenario in which lots of little microscopic Von Neumann self-replicating machines basically eat everything to make more of themselves. Eventually everything is grey ...
Most aliens tend to be humans with bumpy foreheads and/or pointy ears. Even when they do have differences then usually it is an entire species being portrayed as a particular brand of human. For ex...
As a tree grows new layers are added each year so that the trunk expands in radius. The living part of the tree is a relatively thin layer on the outside just beneath the bark, and the wood further...
In many SF stories (or fantasy if you replace science with magic), there is one technology that is hyper advanced in one specific field, like robotics in Real Humans or in Extant, but almost nothin...
My world is science-based with an earth-like biology. The dragons fly when they're young and then grow too heavy and can only glide if at all. They breathe fire by expelling gas and igniting it. Th...
Physical health Sunlight is popularly regarded as beneficial due to the production of vitamin D, but also popularly regarded as non essential since vitamin D can also be gained from diet or supple...
Artificial light could be used instead of sunlight. Much of the basis for this answer comes from this article. The article is mostly about sleep cycles, but it includes some pertinent information. ...
My world has a huge crater (4400 miles in diameter) on a world that's roughly earth equivalent (so a circumference of 25000 miles). The native population doesn't need to know how it was formed but...
Humans (even programmers :-) ) are used to having some access to natural light, but in a colony in space, on the dark side of a tidally-locked planet, or underground (for example) this won't happen...
In the real world — I am from Europe — I often hear and participate in discussions about how printing a paper 2 Euro note would have an impact on micro-economy, i.e. how it would make people less p...
Let's imagine we have an algorithm that produce an elevation-map for a sphere. I wonder if the ratio between the planet radius and the delta between the highest and lowest altitude is a constant or...
