# All Questions

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### How would a rail gun affect the trajectory of a spacecraft?

What sort of force would a railgun need to produce to have a measurable affect on the trajectory of a large spacecraft? In the scifi book I am working on the primary craft of the story is a military ...
18 views

### Can a human eat alien food for the tastiness? And vice versa

Would it be plausible for a human to eat an alien's food (and vice versa) not because said being needs nutrition or such but purely to enjoy alien cuisine. Assuming the species is fairly compatible; ...
15 views

### How would magnetosynthesis work biologically?

An interesting idea that popped up in my previous question on the feasibility of large scale life on a gas giant was a form of energy production similar to photosynthesis, instead absorbing the EM ...
48 views

### Why does Elon Musk say we almost certainly live in a simulated reality? [on hold]

When Morpheus from the Matrix tells us about why the machines use human body heat together with some sort of fusion in order to derive energy, why didn't the machines simply use nuclear, fusion, ...
40 views

### Would A Biological “Cold Haber” Process Deplete an H2/N2 World of its H2 or N2?

Based on my reading on some science papers, large, wet terrestrial planets likely exist that are swathed in a thin atmosphere of nitrogen/hydrogen ($H_2$ & $N_2$). If life evolved on such worlds, ...
46 views

### Is Santa taking off risk creating a black hole, and will the good kids receive presents survive it? [on hold]

Santa has to visit roughly 822 houses a second on Christmas day. At each house he has to stop, go down the chimney to deliver toys, then take off for the next home in a millisecond's time. As the ...
131 views

### Aliens blew up Pluto so we would stop debating whether or not to call it a planet, what happens to Earth? [on hold]

It seems the Fraxians, an alien race from Alpha Centuri, have been secretly watching our television ever since we started broadcasting it (well technically I suppose 4.367 years after we started ...
109 views

### How would basic and complex life evolve in a gas giant

Obviously the chances of life arising in such inhospitable and unlikely as a gas giant are next to none. Instead let us theorize that a local orbiting moon of a Jupiter-like gas giant which contains a ...
168 views

### Departments of an Uplifted Galactic Government

One of the gods in the universe stumbled across an species with potential and decided to uplift it. Instead of uplifting over the course of a couple thousand years, the god decided to do it in one ...
4k views

### Would using carbon dioxide as fuel work to reduce the greenhouse effect?

I'm trying to find a plausible way to reduce global warming in a world past the tipping point. I recently read this article : https://www.sciencedaily.com/releases/2017/11/171127173225.htm. It ...
2k views

### How to hide your own body? [on hold]

It's the perfect locked-room mystery: the police find the victim murdered, but the room is locked from the inside. How did the killer escape? He didn't. After committing the murder, the killer ...
109 views

### Cooling the interior of a spacecraft to below the freezing point

I understand the Apollo 13 CM got down to 39°F after it was powered down following the explosion in the oxygen tank. Could the interior of the ISS be cooled (for more than 12 hours) to below 32°F ...
5k views

### Killing a star safely

A messenger from the stars just arrived in peace but has brought horrible news. A vast swarm of planet devouring phototropic insects are approaching from deep space and our only hope is to obscure or ...
2k views

### What would be the effects of (relatively) widespread precognition on the stock market?

I am working on a story in which around 1% of the world population has at least some semblance of a metahuman ability. Many metahuman abilities are advantageous in traditional employment, and I ...
66 views

### What's the climate consequences of a planet with these characteristics?

I'm designing a new planet, but I'm having some troubles figuring out the climate. The planet's rotation axis is at a 45° angle relative to its orbital plane, and each rotation takes 24h. The planet'...
116 views

### Requirements for race that lives close to a sun [on hold]

I have an idea for a race that lives on a planet that is extremely close to a sun (similar to ours), just far enough away to not be pulled in. So my question is, what would be the requirements for a ...
98 views

### What if Gnostic Christianity won out? [on hold]

If some early church father (such as Saint Paul) had at any point converted and preached Gnostic theology instead, resulting in a different dominant Christianity, what would take place? From what I ...
72 views

### Are you able to mix amber with different elements to give properties beyond encasing and preserving? [on hold]

Is it possible to mix it with other elements to give it properties beyond preservation? Like strengthen a sword, or enhance a person's muscles. I've been looking around to see, however I've yet to ...
72 views

### How can I design the structure of a soul so that it cannot hold on to life energy? [on hold]

When Jehovah create the universe, he left it to the angels to make life as they saw fit. To this end, he gave to them a portion of his power, the demiurge, which is the spark of life used to create ...
5k views

### Can a creature sustain itself by eating its own severed body parts?

I was inspired by geckos which can sever their own tails. I wonder if a creature which has such an ability, especially with a high regenerative power to grow its body parts, can sustain itself over ...
288 views

### What's the largest an Earth-like planet can be and support Earth's biosphere?

For certain reasons I decided to not set my story on Earth. However, the planet is meant to host an Earth-like biosphere (including humans, most of Earth's species (perhaps some that didn't evolve ...
114 views

### How can an elder god's corporation remove suspicion from its plans while preserving its clandestine monopoly?

The elder god Mickeyruth seeks to enter our reality and dominate humankind. To accomplish this, he has used his loyal cult of followers to found a company called Disney. Throughout the decades, this ...
107 views

### How would a very old biosphere differ from Earth's “young” one?

On my world, the equivalent of the Cambrian/Avalon explosion happened 5 byr (2 byr after formation) ago as opposed to 0.5 byr ago on Earth. The planets rough parameters are: mass between 0.4 and 0....
88 views

### Questions about sick trees in wood

I want to write a piece of fiction about a female tree caretaker who researches a small group of beeches in a wood. When she arrives, she sees that the trees are dried out. Is it realistic to say ...
128 views

### In a 'Zootopia' situation who's in power, the Elephant or the Mouse?

Imagine a situation kind of like Zootopia with many different creatures all living in one environment, some significantly larger than others. These species aren't necessarily furries like in Zootopia,...
180 views

### Does my climate map work?

I'm looking for notes on my climate map for a continent I've mapped out. Does this set up seem plausible. Map (Imgur) [3 Previous question with general planetary conditions edit Don't have time ...
98 views

### Can ice magic freeze blood?

In my story, one of my main characters has ice powers. She can turn water into ice, she can conjure ice (sucking moisture out of air and freezing it). She can also drop someone's body temperature, as ...
77 views

### Catagorizing Gods [on hold]

In the world I'm building, the characters are facing, allying, opposing, or simply investigating various gods. It pulls from assorted world myths, legends, religions, and culture (and also recognizing ...
161 views

### How could I scientifically explain a world with day/night cycle only on the equator?

I'd like to build a world that has one pole where it's constantly day (all year long) and the weather is very hot, and one where it's constantly night (all year long) and the weather is freezing. I'd ...
195 views

### Where could materials to build a Dyson swarm come from?

Let's assume we want to build a Dyson swarm that collects over 90% of the energy from the sun and orbits between the Earth and the sun. Also assume that we want to get none of the resources to build ...
115 views

### How do I convince the general population using large monsters is the most efficient means of protecting our compact cities?

Context Monsters are a bit of a problem on this world. Though most pose a marginal threat and are categorized as vermin, others represent a serious risk to major population centers as a consequence ...
215 views

### Infinite energy, helicopters and world-wide attention

Story is set in our days, modern Earth with all it's current problems and conflicts. Let's say someone had secretly found a way to produce almost infinite (reasonably infinite, of course) amount of ...
179 views

### Helping the Roman Empire with chemistry and metallurgy [on hold]

You are a modern chemist and metallurgist and unexpectedly get sent back in time to the era of Caesar Octavius Augustus. After spending a couple years learning ancient Latin, what changes or ...
6k views

### When will the last unambiguous evidence of mankind disappear?

Humanity just disappears tomorrow, let's say it is like the Thanos-snap but it kills everyone. How long until the last unambiguous evidence of our existence disappears? What was this last relic? The ...
159 views

### Gas Giant with solid surface

I have the feeling the answer to this will come down to ''impossible'' but let's ask anyway to be sure. We know gas Giants have no solid surface and if you tried to land on one you would fall into ...
179 views

### What is the largest dragon that could take off without destroying the planet?

Inspired by this answer: Suppose there is an enormous dragon sleeping underground (let's not worry about the biomechanics of how such a creature could exist). One day, it wakes up, shakes the earth ...
645 views

### The plausibility of a pack-hunting carrion-eating snake

I was thinking of a hypothetical species of snakes that join together for protection called Ladôni, due to their habit of mobilising in massive beds which make them resemble a large multi-headed snake....
177 views

### In a stable medieval fantasy population, what should be the yearly birth rate per 1,000 people?

For a human or human-like stable, small settlement population, living in medieval fantasy, how many yearly births per 1,000 inhabitants are expected? Assuming: There is no major epidemic. There are ...
92 views

### what is the proper physical build of a fantasy adveturer? [on hold]

I am trying to make a game and I want the characters to look somewhat like they could actually be someone who goes around slaying monsters, fighting evil over lords and their henchmen, all while still ...
3k views

### Who or what determines if a curse is valid or not?

I'm making a fantasy world and wanted to incorporate curses and geases into the story. When I say "curses" I mean two types, but mainly this: The type where you write your curse and either: perform ...
93 views

### Does a black hole have a speed limit for absorbing matter? [on hold]

Does a black hole absorb all matter at the same speed regardless of whether it is light or normal matter? Say it begins to suck in a photon and also some asteroid. Will both objects be accelerated/...
110 views

### Effects of multiple moons on a planet

Judging by our own planet we know what the effects of a moon on a terrestrial planet are. We also know that if a planet has two moons on the same side you would get insane tides and that two moons on ...
89 views

### Required RPM for a Hamster wheel style Habitation ring on a spaceship to generate roughly Earth-ish gravity [duplicate]

I'm looking at a ship that is pretty big. About 720 feet from nose to tail, with two stonking big rockets on the sides, these will flip for deceleration. At roughly the same rotational pivot point, in ...
219 views

### Can you prevent a star from dying with infinite energy?

In my story, an advanced alien civilization that can travel to other universes has created an infinite energy source, named "an amvelian core". This core resembles a small sphere in appearance (about ...
170 views

### Can a person who gained immunity to a disease become an infectious carrier?

If a person is sent out of their hermetically sealed community and in the process becomes immune to a deadly disease. When the person returns will the immunity make them a carrier and infect/kill all ...
3k views

### What could make large expeditions ineffective for exploring territory full of dangers and valuable resources?

Some sort of cataclysm suddenly creates a territory full of deadly monsters and other dangers, but also valuable resources. Trivial example: a magic volcano suddenly erupts and the mountain is now ...
6k views

### Which modern firearm should a time traveler bring to be easily reproducible for a historic civilization?

Eureka! Our hero just discovered the secret of time travel, but what to do with it? "I know!", he says. "I will travel back in time as far as I can and hand them a modern firearm. They will learn how ...
138 views

### Kinetic weapons - establishing an upper limit when dealing with grey goo

This answer to my last question suggested, rightly, that there are targets dangerous, and large scale, enough that there is neither overkill nor spillover damage when it comes to attacking a planetary ...
612 views

### How would thermophilic fish survive?

I'm designing alien creatures for illustrations, and I'm just sketching some that might live in areas with a lot of geothermal activity. So basically, animals that live around geysers and hot steam. I ...
117 views

### Terraform Mars with Phobos dust?

According to the following reference, a few tons of infalling space dust cause the Martian clouds: https://www.sciencedaily.com/releases/2019/06/190617125120.htm. These clouds can boost local surface ...

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