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How would the human eye have developed differently on a planet with two suns? One sun will be a yellow star functionally the same as Sol and the other will be a red dwarf. The planet will be ea...
Could a planet's axial tilt change a meaningful amount (what is needed to make inhospitable biomes even more inhospitable: hotter dry hot desert, colder north) over an extremely short period (~100 ...
Is it conceivable that colonists/astronauts on a long term mission in a low gravity environment might use a low dose of an anabolic steroid (such as Equipoise) to prevent extreme atrophy in their m...
Though my star is 1.71 LSol, my planet orbits at about 2.14 AU. Following a back-of-the-envelope equation for apparent brightness, this gives the surface of my planet approximately 30% of Sol's lig...
What sort of life could live in a ocean with no bottom. In this scenario, there is no seafloor, no matter how far down you go. Once you exit the continental shelf, it plunges straight down into inf...
Elves and human share many similarities, from body type to the ability to perform magic. However, elves retain a slim, lean build throughout their life, and are incapable of becoming obese. The big...
If I were to have a generally earth like world, with water and land masses very similar, what could you add to make storms happen more often, and more specifically, lighting storms. I know lightnin...
Boats and balloons both work because of buoyancy - they are pushed up by a force equal to the weight of displaced water/air respectively. I want my (otherwise earthlike) planet to have 'seas' of a ...
In a lot of media one can see moons or other planets that cover a significant portion of the sky (like the background on this page for example). This could be because the moon is actually large or ...
What can cause water to be foam-like, in lumps, but still liquid? Something similar to goo (jelly like but liquid and opaque)? I have a planet and such kind of water, which is drinkable and the te...
The classic example of a cylindrical space habitat, Clarke's Rama, has a 10 km-wide ring of water at the middle. Most depictions of this O'Neill-style of habitat do something similar, placing a lar...
If the water on earth were displaced to surround the earth in the atmosphere to create a water canopy, how thick would that canopy be? I apologize I should have been more specific in my original qu...
When I played Zelda: Breath of the Wild and met the heavily redesigned Ritos, I took an immediate liking to their designs. Although the fact that they're fully bird-like helps, it's mostly because ...
On a timescale of 1e11 years, all uranium and thorium will have decayed, but planets will still exist, orbiting red dwarf stars. Would it be possible to use lead as a nuclear fuel? In principle, t...
I've been playing with ways to make my world interesting, and also further justify the limited use of ferrous metals. One idea I had was that my world might undergo regular and intense geomagnetic ...
One of the first things noted about pretty much any humanoid race with horns or antlers is that the neck would not be able to support the weight, making the idea unfeasible. However, some horns are...
For one of my projects, I'm developing an inhabited Earth-like world, with the key visual difference being that much of the land is purple, instead of the brownish colour it is on Earth. My questio...
Why this question is different from existing questions... The closest question to mine is Anatomically Correct Cerberus. It is clear from the answers to that question and indeed it's axiomatic to ...
From what I know about the periodic table, in order to add a new element it would have to be above the current highest element. And up there this new element would be unstable. But could I just re...
So, I don't believe that the "angelic" type winged human can exist (y'know, the kind with the feathery wings sprouting from the back). Too many problems of anatomy, weight, etc. But I am trying to ...
If some kind of insane wizard began a ritual that would turn the inner core of the earth into gold, what would happen? Over the course of 15 days, the entirety of the core will become gold. Each ...
From the dawn of fantasy fiction, dwarfs have most often been described roughly in the same way: short and stocky, long beards, can smith stuff, good fighters, can live for hundreds of years aging ...
On an hot planet at the wooded poles are two aliens species that coexist in a mutually beneficial relationship. The Honey Mouths use gecko-like feet to hang from the far larger Thorn Shredders, wh...
So I have a super-Earth that has 2 moons. Moon 1 is a bit smaller than our moon, and has an orbital period of 19.25 earth days. Moon 2 is larger than our moon and has an orbital period of 147.15 da...
Take the Jovian moon Ganymede as a real-world example. It has an orbital period of ~7 days around Jupiter, which is effectively its day and its year simultaneously. My characters will need the wo...
