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About 5 billion years from now, the Sun will begin to swell into a red giant. This will cause some problems, because life on a planet orbiting a red giant is hard. Even if Earth isn't engulfed by t...
Question: many SF stories (e.g. The Expanse) put living organisms in highly radioactive environments and show them consuming that energy in some way. How might organisms put into these environments...
Premise Suppose a cult has been receiving special "visions" of doom far off into the future. Even though this prophecy of doom is not impending in the here and now, these cultists are very long-te...
Note: this is not a duplicate of Anatomically correct Giants or What would be the tallest possible height for humanlike creatures in earthlike conditions? because my giants are far from humanoid. A...
I had an idea about a lineage supposedly cursed so that the women only give birth to more women, but I'm thinking that some outside force purposefully mutated/altered their DNA to cause the effect ...
I mean in the far future megascale be advanced enough to allow the construction of a ring world around Earth or around a low mass star( a red dwarf for exemple). If yes, how big Earth would look f...
Let's say a group of people live on icebergs. They want to shape them - e.g., let's say they want to add a pier to their iceberg, how do they "grow" the ice. Prefer a primitive answer, but if ther...
Is it possible (either through genetic engineering or evolution) for a biological creature to be able to detect and absorb electricity from power sources like batteries or other animals? I know th...
The United States (as well as many other countries) is covered in a vast network of tubes: These tubes vary greatly in diameter. Some could hardly fit a baseball, while others are large enough ...
So I got this species of vampire-creatures (no conversion of other species, just mating and reproducing in typical mammalian fashion) that subsist entirely on blood. I'm using a bit of magic to imp...
In my world, there would be a tropical region very similar to real life rain forests, though underground there's still jungle. At a point underground, there are huge caverns that are populated by ...
While constructing a planet, with the same mass, volume and overall composition as Earth, how do I know how many tectonic plates should it have? And what does having more or fewer tectonic plates c...
I'm developing a silkworm that spins webs of a particular kind of "silk" and weaves thin, fragile webs. The magic part of this is that it also spins wind. The following addresses how this works and...
Some hundreds of years ago, all humanity was removed from the Americas. In fact, most humans are gone from the world altogether. In the intervening time, nature has overrun the formerly human domin...
This is the continuation of a thread of related posts on a hypothetical alternate universe/Light Plane. Other posts from this thread are here: How To Make an Earth with 27 Suns Work Radiation L...
How would fire honey be useful and manageable to a beehive/bee colony? Info In this scenario, bees harvest nectar from a particular flower. The nectar is not only spicy from capsaicin, but litera...
A secret group of environmentalist ultra-extremists has engineered a virus (or virus-like pathogen) with the purpose of making all of humanity extinct (yes, including themselves). They are aware th...
We know that as a planet increases in size, its surface gets covered by oceans (more water is captured by gravity and shape is more spherical). Therefore, a planet larger than Earth can not have a ...
I'm trying to "build" a world in which the moon is always visible at night, and only at night, to the majority of areas on that world. I've been told that an L2 Legrange point could be a viable con...
I'm creating a developed country in South America with its development similar to that of Canada or Australia (little behind the US) with population around 160M in 1850, growing to 346M in 1925 and...
So, on the planet Qualis, a reptilian species, known as the modern Qualians, evolved about 200,000 years. Before that, most fighting was down with claws and teeth, and the Qualian ancestor that had...
In my last question, How large could my sea serpents be?, I asked what length would be a) possible and b) necessary for a whale-eating sea serpent. My sea serpent is a constricting predator* in a c...
In an alternate Earth, coral has been extinct for over 400 million years. In their place were the following: Bivalvia (clams, oysters, mussels) Cirripedia (barnacles) Canalipalpata (bristle-foot...
I am creating a world in which a civilization has achieved advanced spaceflight and has begone colonizing other planets in their solar system that is similar to ours, but with more planets. However...
I've got a group of magical people living mostly incognito in an ancient society. They look and act exactly the same as regular people, but they are really magicians, and a side effect of having th...
