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Imagine a world where a creationist situation holds: God (or an alien master species, if you prefer) created all the species you see in the world today, and there will never be any others. Are th...
Let's suppose we have found a new human colony today, somehow populating Pluto. They have good technology, much like ours and we don't want to slave them. We want to establish a communication link ...
Imagine a planet with the same climate all on the surface. There is only one living creature on this planet (let's say a plant to avoid food problem). It is perfectly adapted for the climate. And ...
In this question someone suggested that the classic 'elf' ear could evolve for the same use as whiskers. How (un)realistic is this idea. Lets assume that the humanoid species that evolved these ear...
I just got shoved through a stargate onto a planet I don't know. I was told the gate would open again in exactly one Earth year. I wasn't carrying anything; I don't even have my watch. How do I k...
One of Milutin Milankovic's three big factors in his ice age theories was Earth's obliquity, or axial tilt. Earth's axial tilt varies between 22.1 and 24.5 degrees at an approximation of 41,000 ye...
Picture, in a near future, that we build cities vertically rather than horizontally. Need a new city block? Add another few floors. Disregard for the moment any physical construction problems this ...
Here's the setup. You have a gigantic mildly futuristic city, where construction is vertical rather than horizontal. Need a new city block? Add another few floors. Disregard for the moment any phys...
Imagine that, without any aliens having been ever found, we get to a point where we can build sub-atomically precise simulations of reality, spanning at least something the size (if not the likenes...
In my story I want to have a sub-class of humans who are very domineering and greedy. They are obviously pro-slavery, and believe in survival of the strongest. I'm wondering how this mindset would...
My world contains a race of creature that does not speak to communicate, they sing. They are humanoids, living in similar conditions as humans. They are intelligent, they have a complex langage, ...
What would happen if there was two more planets beyond Pluto, one with two times the size of Pluto and another with 4× the size of Mars, I'm curious to know what effects this would have on the plan...
Disclaimer: This question uses some liberal wording to get key ideas across. It's not meant to be academically rigorous, so please try to focus on the ideas and not the exact definitions of the ter...
I have an earth-like planet orbiting one of the stars in a binary system. I have learned that, for G-class stars, if the secondary star is 100AU from the primary one, I can expect the secondary st...
Can humans live on an Earth-like planet where the only difference is that the surface is ~50% water, instead of the ~75% of now? That is, paleolithic humans... And the new land area hosts the sam...
Back home, the Pleistocene ice never reached farther south than New York or London. These ice ages had been coming and going for two and a half million years. On average, there was enough ice to ...
This blog post about binary-star systems points out that, rather having the stars be close together, they could be far apart and a planet might orbit just one of them. It gives the example of the ...
Back home, the bird order Passeriformes consists of roughly 100 families totaling up to roughly 5400 species--that's over half of the entire class. But if the songbird order never existed, how wou...
For my WIP's setting I'm using a variation of the Sky World concept. The cosmos looks very similar to the Astral Sea. The shape of the cosmos akin to a torus and filled with a silvery ether a thin...
Imagine a strip of land that divided the world in two, by encircling the globe, connecting the poles. I want this belt to form naturally and be a constant feature, at least for over 5000 years. A...
The humanzee is the theoretical hybrid of human and another primate. No such humanzee has ever been documented in the modern era, though genetics suggest in our distant evolutionary past primitive...
This question asks about traditional artificial wombs viability (Is an artificial womb feasible?). I was wondering if we could take an alternative route by using a biological womb instead. Is it ...
Imagine an advanced A.I. with access to the brain of an 18-year-old. However, this 18-year-old has had no exposure to humanity or the outside world until now, the only information he has received i...
I'm working on a bit of world building, and I was curious if it seemed to much more experienced worldbuders than I that including a collision with Halley's Comet in 1835 or 1910 as a major plot wo...
Please note for this, assume technology is being used for their creation, not any kind of space major or anything. Edit: Removed the ability to do so within systems without having generators on b...
