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I have a planet around 11242 km in diameter. It is very similar to Mars, with most surface water trapped at the poles. For this, I want the polar temperature below 0 C, but the equatorial temperatu...
So far I've been using Artifexian's How To Build A Star YouTube video. The problem with this video is that it's quite old and thus outdated. The things I've noticed to be particularly weird are the...
Assuming all the primary hurdles in building a space elevator are overcome, would it be structurally feasible to attach intermediate stops along the length of the tether (between the planet and GSO...
In many sci fi universes that don't have handheld energy weapons, they instead use solid projectiles that either go big (Warhammer 40k) or really small (Mass Effect). The former I have a pretty go...
No, this is not not about courtship displays or dominance figths. (even thought I know that that is also part of mating) This is more of "What their genitalia would look like" and how they would "...
Right now I'm currently trying to calculate the average surface pressure at sea level of an atmosphere, but I'm having a struggle finding the relevant formulae with which to determine this number. ...
The fluff: I have a humanoid who's about to breach a door. He's got some upgrades to his body and can pump some stimulants through it to boost his strength, resiliance and speed to ridiculous prop...
I have seen a variety of outer space megastructures across sci-fi and the minds of most astrologists, such as Bishop Rings, O'Neill Cylinders, Bernal Spheres, and much more. What most of these inte...
Humans are not the fastest mammals on the planet, but for very long distances (more than 40 kilometers) we can overtake any species living on land. Except some dogs. The best runners on ultra-long...
First time posting here but I would like to get some help with an issue I have. I have a planet that has 30% more gravity than earth. I have terrestrial animals with an exoskeleton, they stand at ...
My question is: What needs to be added or improved in the human body so that my genetically modified people can fully withstand temperatures of several degrees below zero ( "” 40 ° Celsius) for a ...
My planet is tidally locked, airless, and has no magnetosphere. It's located close to a flare star (5% solar mass, 11 Gyr old), and is in it's habitable zone. The strongest flare ever detected on E...
Normally, the human retina contains four types of light-sensitive receptors: three types of cones and one type of rods. The receptor proteins contain the chromo "” iodopsin in the sticks, the rhodo...
Respirocytes are an artificial analogue of red blood cells. Tiny sapphire capsules that can absorb oxygen in the lungs and release it in the capillaries. From the capillaries to the lungs, they, in...
A thought occurred to me, and I wondered if it could be made practical... This video talks about the possibility of electrical battery powered planes, and in short, while it may be practical to bu...
My question is: I need to improve the muscle fibers and nervous system of my genetically modified human so that it has dexterity and physical responses 4 to 10 times faster than the average human.Â...
Let's assume a world where humanity managed to stabilize the climate again and maybe even reversed the effects of the current climate change. (So that we can ignore the current global warming in th...
Doing research into my time braking world I was referred to Split Second by Douglas E. Richards. It turns out he conceived of the exact same machine that I did, however he handled the paradoxes dif...
How do I calculate the thickness of the upper ice layer on cold ocean worlds like Europa, Enceladus, and Ganymede? I'm asking this for a programm I'm currently writing. The given/known quantities ...
My question is: what needs to be changed in the body of my genetically modified people so that they can safely drink toxic water ( most often industrial wastewater is contaminated with industrial w...
So, somehow, I have discovered a process that makes an objects mass negative. Not its weight, its mass (although, I guess that the weight would also become negative). The thing is, before I try it,...
I am currently brainstorming a hard (like the hardest possible; everything that occurs in the story must at least be theoretically possible) sci-fi story which will take place far in the future. I ...
Contrary to popular belief serpentine dragons are not in fact magical or related to the European wyvern but instead are descended from the Chrysopelea. some common characteristics of serpentine dra...
Prosimians on average are not as intelligent as their simian counter parts with the notable exception being lemurs which live in semi large groups. what I want to know is could a group of prosimian...
What needs to be changed in the structure of the human stomach so that a person is almost completely immune to poisons and toxins ( especially interesting regarding the poison of puffer fish, Gray ...
I know this question has been asked in similar places, but I'm after a specific part of the problem. Assuming the following: Perfectly flat, infinite world Earth's atmosphere Sun directly overhea...
So, one of my D&D characters has a cut/relief-carved quartz crystal amulet (medallion shaped) that's both an arcane focus (crystal) and a holy symbol (amulet), and I thought it would be a good ...
This is my first world and I want to build in a way that is physically possible (if this is possible, otherwise make the necessary changes) for my civilization (which is mostly fleshed out) but I d...
Counter pressure spacesuits allow, in theory, a wearer to not be in an air tight space suit and work in a vacuum. What is the minimum such suit that could be used in a survival situation, on a shi...
I need to know how wide the diameter of a space fountain's* particle stream is in relation to the mass it's trying to support. It would have to lift its mass at least 40000 kilometers. The vacuum...
Stun-wizards specialize in blinding and deafening opponents at a distance. To do so, they can exert their magical power to manifest a spherical region of vacuum by essentially "telekinetically" pus...
Most animals that glide are rather light and small. Flying squirrels, Colugos, and sugar gliders all weigh but a few ounces. The largest gliding predators are snakes of the Chrysopelea genus. Agai...
I'm working on a tabletop roleplaying game about witches. I have most of the mechanics of broomsticks worked out, but I'm having trouble deciding on top speeds. Speed limits are not a result of how...
I have posted a similar question where I asked how can two realities mix into one reality in which I received many helpful comments. I realise I should've expanded on the details I posted, so I wil...
For complicated reasons our hero's blimp in the Venus atmosphere at an altitude of 50 km gets a tear in it and sunlight floods inside (there is no gondola, the blimp is a semi-ellipsoid of breathab...
My question: What is it that needs to be improved or added to the human body so that it can withstand critically (fatally) low and high (if, my genetically modified person is underwater or a very d...
The response time of the human visual channel in a relatively quiet state is approximately 40 milliseconds, which provides a" frame rate " of 25 frames per second. At the same time, it is not just ...
Interstellar travel is hard and complicated, yet I want to have a plausible interstellar propulsion system for my setting. Rockets are out because of the rocket equation and the horrible top speeds...
Like it says on the tin. Problem? Basic configuration is not going to work. If I used several additional layers and all the Outer and Inner layers using carbon nanotubes, whereas the Middle Layer(s...
This question asks for hard science. All answers to this question should be backed up by equations, empirical evidence, scientific papers, other citations, etc. Answers that do not satisfy this req...
What is required for advanced lungs to filter dangerous chemicals (so to speak, to carry out the detoxification process) and then use oxygen? (It is advisable to take into account the above record,...
So say there was a rogue gas giant about the mass of Jupiter that, unfortunately, happened to be headed directly at Earth (or at least close enough to knock it into an orbit incompatible with life)...
The Breakthrough Starshot is a method of robotic interstellar exploration by launching thousands of small centimeter-sized probes, each equipped with a 4 x 4 meter light-sail. Thanks to their small...
Magical fire is often depicted as flames. To get fire and flames the right mixture of oxygen, fuel and heat is needed. Assuming that the magic only provides the heat, there are only two chemical re...
I have a pair of survivors living in a trailer (18-wheeler's trailer) and they have found about 3 pounds of cigarette butts and have decided to burn them for warmth. What would happen to these two?...
Let's say Santa got himself a new toy: a present delivery cannon. With this new cannon, he wants to deliver presents to children by shooting their presents from the cannon into their chimneys. Let'...
How realistic is the concept of a space gulag? So let's say you want another option outside of a stern talking too, a fine, confining to quarters, demeaning tasks, VR "re-education," beating the s...
One of the basic requirements for life is effectively food. One of the basic requirements of engineering is that we lift off with as little mass as possible. If we choose to explore the solar syst...
The environment is set in (ideal) space with no air for the bullet to interact with. It should encounter nothing until it reaches its target. The bullet is assumed to be a perfect sphere with a di...
I have a layman's (re: not very good) understanding of nuclear physics, and it's pretty cool to me, but I'm quite bad at math. I'm working on a sci-fi book (classic, I know) and just finished a dra...