General Q&A about worldbuilding and other speculative developments that can be extrapolated from science.
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The setting is fifty-five million years in the future on Earth, with multiple humanoid species that have different ancestors, but share similar characteristics. Their ancestors would be animals tha...
Mass of star: 0.75 M☉ Radius of star: 0.69 R☉ Surface temperature of star: 4,620° K Luminosity of star: 0.2 L☉ Satellites: 2 Place in solar system: 2nd Mean radius: 8,725.1 km Mass: 2...
just suddenly struck by curiosity, i vaguely remember that big quadrupedal or hexapodal (if you count the wings) animals cant fly well basically. I dont remember why, but i think it was related to ...
I have some plasma life forms that have evolved within the photosphere of a star and also capable of existing on a neutron star and the ergoshpere or accretion disk of a blackhole. This lifeform c...
Could a planet with the size and characteristics of the Earth orbit a gas giant and would the earth-like moon be able to maintain its orbit if the gas giant went rogue and was launched from its hos...
I'm building a world with cities of extremely different technological capabilities. One has a monopoly on gunpowder and one has complete understanding of the magic system in the world. The only t...
(or some other Lesser Canyon) I'm playing with story ideas for a videogame that takes place in the post-post-apocalyptic US. Everything is overrun with monsters and ocean horrors and whatnot, you'...
This was an idea for a flashback as I pick up my story around 100 trillions years from now at the point where star formation is ceasing and the red dwarf and stellar remnant era begins. Now living ...
So, I am dealing with a certain trouble that I'll need a help with. In my fantasy story, there is artificially formed species (magically created, but non-magic anatomy rules apply) of "humanized" ...
In a humanoid mammal, say 15-20 feet tall, how would the brain, heart, reproductive organs, facial feature and other attributes scale up? In very large mammals, the brain seems to be comparatively ...
Ray-finned fishes have a variety of interesting and complex jaw structures. Here is the skeleton of an anglerfish Here is the skull of another actinopterygian I am designing a large (roughly...
With the emergence of cyanobacteria on earth 3.5 billion years ago, the shift from a reducing to an oxidizing atmosphere began. "The atmospheric O$_\textrm{2}$ levels (in PAL; i.e., normalized to ...
Most arthropods have at least six legs. Some mites have four and some insects have none, but for the most part, they have six or more. What would the anatomy of a large quadrupedal arthropod be li...
Im writing a story about a boy in the year 2033 that is immune to a zombie like virus (world war z like zombies) and when he is bitten instead of turning into a brain dead zombie/infected his body ...
In the late 23rd century certain groups of mankind stared down the barrel of what may be possible in the future: cross galactic relativistic kill missile storms, gamma-ray Dyson Beams, Kugelblitz b...
I am writing a novel where a habitable moon orbits a purple gas giant. In looking here and elsewhere I'm finding it incredibly hard to get a sense of the elements-breakdown of elements that would b...
This is a small arrow shaped creature that can fly without wings. Can it use electromagnetism to fly? Or maybe something to do with ions? Or however ufos are theorized to work? I'm not quite sure...
Tetrapods evolved fingers from the inner-bones of the fins of lobe-finned fish, could hands ever evolve from ray finned fishes if they were to become fully terrestrial, from a mud skipper ancestor?
I've recently been playing a alien game with various alien species. After playing for a bit, I wondered whether or not a 6-inch tall intelligent race could exist. I can already see some major disa...
My civilization is planning to being starlifting, mining a star by heating up portions of its surface and using a powerful magnetic field to channel the matter away from the star and into storage u...
The largest eye in the world belongs to the giant squid, which has eyes up to 27 cm in diameter (some reports from the 1800s say 40 cm). Extinct ichthyosaurs also had very large eyes, 20-30 cm in d...
I'm writing a short story where a group of explorers found a mysterious cave in a remote jungle , Inside the cave they find strange paintings of spirals resembling portals , after exiting the myste...
So, when it comes to humanoid races, this has been a problem for me for quite some time. Sure, mammals (werewolves, gnolls, minotaurs, centaurs) are a no-brainer. I even decided to give tengu somet...
Working on my Nintendo Kirby alternate universe where things are more biologically realistic. Many life forms are roundish legless creatures that can move by bouncing. How can this work and is it...
Vertebrates on land are limited in size by various factors. However, in the water, they can get much larger. How large could an aquatic humanoid creature (like cthulhu) realistically get, and what ...
In one question I asked how insects can evolve their base biology to grow in size here. Which was followed up by this question about how well the antennae would fare when increased in size here ...
So, strength is a bit unusual in that though he's a kaiju that's clearly inspired by Godzilla, he's completely artificial and was created deliberately to serve as a mobile fortress in The Union's (...
Assuming that as a species, we do ourselves in, not through war but through environmental neglect and overpopulation, what species will benefit most from the effect we have had on the planet during...
I was zooming around on Space Engine and came across the moon of a gas giant that was hovering well above the galactic plane. I'm admittedly not well-versed in under what conditions an Earth-like p...
I'm working on a concept for a habitable world with venus-like atmospheric pressures, where humans have settled onto huge tabletop mountains where the atmosphere isn't as crushing. This is a terraf...
Skippable Introduction I asked a similar question 2 years ago and never got a real answer. I was told the question was too broad or "it can be whatever you want" "magic can do anything" so I thoug...
So, my understanding of how Alcubierre drives would theoretically work is not particularly complete. I know it involves compressing and expanding space, but I don't really have an intuitive grasp ...
Would it be possible for aliens that originated and evolved in a planetary system beyond the ring singularity of a rotating black hole to send individuals out into a normal universe to colonise it?...
Quick Overview Here's the situation: your species, under directive of your friendly world government, has been informed that all "natural" (aka reproducing like your normally would and having a ch...
Would the principles at work in the theoretical Alcubierre warp drive apply to a slower-than-light starship? I'm building a setting in which FTL communication and travel is impossible, (due to vio...
Having your radiators tactically protected from enemy fire by the armor shape of your space warship is nice, but having a regular one or double-sided radiators is still a vulnerability. Other conce...
In my alien world life has evolved very convergently with life on Earth. Carbon-based lifeforms managed to evolve multicellularity and evolved a lineage of organisms in line with early fish, howeve...
After researching many head shaping cultures like the Paracas and proto Nazca it seems there is no adverse affects beyond physical. What would the affects be on a gorilla? Would it be able to funct...
The Apex predator of the Sea of Grass biome from planet Andromeda is mostly bipedal, but capable of facultative quadrupedalism, it has long limbs, powerful claws on its hands and is roughly the siz...
Recently I've been looking into Metallic Hydrogen as a fuel for the vehicles of my fictional future world. The only issue is that I'm uncertain if the blasted stuff is metastable. And while I kno...
The continent is located on the Earth-like planet. The first map depicts a rough Köppen classification (which is there to give you bit of a context). Note that: Types 13 and 14 are undefined/p...
Welcome to planet X! Planet X is the same as Earth in radius, composition, axial tilt and orbits star Y (identical to the Sun). Planet X has a moon known as moon Z (identical to Earth's moon). Cou...
In my world, I plan for an alien pathogen to cause drastic mutations in all lifeforms, reshaping animals and humans alike in a scenario of near inversion of positions, with animals achieving human-...
I'm currently working on something where breechloading rifles and cartridge shot are developed very quickly over matchlocks and flintlocks. What major technological hurdles need to be overcome for...
In my story there are a species of humanoid bipeds (i.e., two arms, two legs) that have a more-or-less human arm anatomy but differ in having non-retractable claws instead of nails on all five fing...
We divide the year into months of ~30 days because that's roughly the period of the moon, adapted to fit a solar year. However, would a civilization living on a world with no moon but a year of ~3...
In various science fiction works, we see our plucky heroes beaming down to, or flying down to planets other than their own. They meet with the inhabitants there, be they human or otherwise and then...
I'm working on a military sci-fi piece that involves a lot of exo-skeleton enhanced, well, parkour -- for lack of a better term -- and was wondering how to deal with descents from great heights. ...
So, Georgie, the paladin who's still unsure about going down the path of lawful stupid, decided not to kill the dragon. Now, this means they can finally use The Orb of Dragonkind for something afte...
The planet I'm thinking of is of similar size and distance from its star relative to Earth, but it lacks oceans, instead consisting of one massive continent with a huge mountain range (reminiscent ...
