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votes
2answers
94 views

Where does mana come from? [closed]

I’m slowly developing a magic system loosely based on how magic is usually seen to appear in most fantasies, but with consistent rules. So far I’ve decided that mana exists in the world alongside ...
4
votes
1answer
236 views

How big can a whirligig/planetcake get while still maintaining human-survivable gravity at its equator?

A whirligig/planetcake/whatever punny name you want for it is a super-sized planet (we're talking about Jupiter masses here, not Earth masses) that spins so quickly that it's shaped like a pancake (...
8
votes
4answers
2k views

What are some of the structural problems inherent to a kilometer-scale hydrogen airship?

Airships are interesting vehicles, in that they are, as far as I know, the only ones to turn the square-cube law to their advantage. For a proportional increase X in length, width, or height of the ...
3
votes
0answers
55 views

Climate after the Ragnarok IMPACT

I am curious (with reasons) about what will happen after an asteroid (called Valhalla 2! Valhalla 1 had collided with the Moon!) collides with Earth. Initially, Valhalla 2 is a major fragment that ...
11
votes
9answers
3k views

Would an immortal member of a species stagnate the species' evolution?

A member of a species becomes immortal, loss of senescence, incapable of dying from age-related issues. Otherwise it remains the same as other members of its species at the point at which it became ...
1
vote
2answers
99 views

What is the maximum percentage of sky that could be covered by a super-Jovian world?

Puffy Jupiters can be huge but the Kepler data suggests that traditional super-Jovian worlds nearer the goldilocks zone, or farther from their parent star, only reach about 10% larger in diameter than ...
7
votes
2answers
226 views

Self-sufficient Airship

Self-sufficient Flying Vessel Let's assume that something has happened to the Earth. I won't be going into detail about this, but assume that if any living organism comes within 2 miles above the ...
2
votes
1answer
43 views

What would a gondola carried by a giant bird look like?

In the world I'm designing there is an island with a kingdom there, people in that kingdom have learned to tame giant birds and use them for transport. One such means of transport is a gondola with a ...
-8
votes
0answers
60 views

Electromagnetic physiology

An electromagnetic ray fired from the my organism mouth, the EM Beam is incredibly deadly to those on the receiving end as the beam’s magnetism is up to 1 quadrillion gauss and strong enough to ...
1
vote
1answer
51 views

What elements/compounds would be in the body of an alien living in this specific set of environmental conditions?

What elements could be in the body of an alien that lives under these conditions? 5/16 of the atmosphere contains sulfur (1/16 hydrogen sulfide and 1/4 sulfur dioxide) High quantities of sulfuric ...
0
votes
2answers
87 views

Are boomalopes possible? aka a species that produces a flammable fuel?

I was inspired by this creature in a game called rimworld the creature when killed explodes and leaves a fireball ,and a corpse , when it does. The sacks on it contain a liquid that can be used as ...
4
votes
2answers
53 views

Explaining Chasers as a Evolutionary Stage of a Caterpillar

I recently discovered Chasers (described here) are basically impossible as a form of giant caterpillar, since caterpillars are a larval stage and need to store energy for metamorphosis. However, if ...
7
votes
1answer
538 views

Can a hydraulic system also serve as a battery?

Hydraulics commonly use mineral oil or water to provide the pressure needed for mechanical movement, which is good but the liquid just sorta sits there not doing anything else. So I though “why not ...
4
votes
1answer
160 views

Could this centaur anatomy work and fit together?

The centaur externally appears very human-like. Their forelegs are humanoid but with a horse's hoof on the end. They also have human-like hips to support the forelegs. The horse body is similarly ...
3
votes
1answer
72 views

Software for simulating a slice of an atmosphere?

For my world, I want to simulate a 2d vertical slice of an atmosphere, to test if my assumptions about it are correct. The software needs to support gas compression via gravity, different gasses used ...
3
votes
1answer
309 views

Would there be ocean currents in oceans of sulfuric acid?

Would there be ocean currents in sulfuric acid oceans? For my world the oceans are made of sulfuric acid because of the high amount of sulfur in the atmosphere, and I was wondering whether there would ...
2
votes
0answers
83 views
+200

Weather for a dense-atmosphere water world

In this answer, I describe a low-density water world with a surface gravity of 1g and a surface atmospheric pressure of 20 ATM. The air temperature at the 1 ATM altitude (naively, assuming a ...
2
votes
5answers
104 views

What tests might someone do to assess possible brain damage from time travel? [closed]

I have a character who travels in time, but after making major jumps (like 100 years forward), she begins experiencing side effects—first nose bleeds, but the symptoms begin to increase to things like ...
3
votes
1answer
63 views

Is my dragon's fire plausible?

The dragon, through a gland, produces a flammable oil from the fat of the animals it has eaten, the oil is stored in a bag, the blood circulation around the bag increases, heating the oil to the point ...
6
votes
1answer
425 views

Is a fall into a high-pressure atmosphere survivable?

In my question What is the largest achievable oxygen-atmosphere world?, my answer suggests an atmosphere of standard terrestrial air with a sea-level pressure of 20 ATM and platforms at an altitude ...
5
votes
3answers
197 views

Would merfolk kept in captivity suffer from lack of oxygen?

In my story, in the midst of a human-merfolk war, merfolk are captured by humans, and are periodically de-scaled (they grow back) to sell their colorful scales as jewelry. In these farms, the merfolk ...
6
votes
1answer
181 views

Feasibility of Giant Caterpillar Archetypes

Note: This question is not about the feasibility of giant caterpillars. That is covered by the addition of magic. However, evolution and natural selection still apply to magical beings (and I love ...
11
votes
16answers
5k views

What kind of substance that existed in the Middle Ages could, when ignited, potentially destroy everything within several miles?

I am a DM for a homebrew D&D 5e game. In terms of technology, the time period loosely takes place somewhere between 1100 and 1400 CE (so High Middle Ages to Late Middle Ages). The villain of my ...
0
votes
4answers
141 views

Everyday life in a country/society where intentional homicide is not a crime [closed]

In this hypothetical society, intentional Homicide (murder) is not a crime but society can develop normally and people carry out normal lives. I believe this could be possible because I read that ...
3
votes
3answers
81 views

Hours of sunlight calculation

TL;DR - How can I calculate the hours of sunlight a spot on a planet gets when I know its location, time of year, and altitude? How would having objects in the way affect these values? I am currently ...
4
votes
1answer
173 views

Hard Science Superhumans [closed]

For my story, I want to create a group of superhumans- to be clear, not humanns with powers, but just humans who have been bioengineered beyond normal human capabilities. This can be something with ...
2
votes
2answers
114 views

Can a creature have possible locomotion if the legs are positioned in a x formating to the pelvis or this symbol ><

My alien creatures are arthropods: multiple limbs, segmented bodies, etc. Is it possible for them to walk if their legs are placed in a x formation in thier pelvies or similar to the shape of this ...
6
votes
5answers
344 views

underwater calendar for merfolk?

In the world I'm creating, I have merfolk who have human-level intelligence, live in pods/tribes of 10-50 (but are connected to each other and trade and exchange information frequently). Most worship ...
2
votes
1answer
114 views

Could a fish lie horizontally with an air-space in its head?

The polyp-fish is a soft-bodied sea-creature about a foot long. It has in its head an organ that forms an inflated air-space filled with gas, which makes the head appear hard and round. The rest of ...
12
votes
7answers
1k views

Is there any kind of biological mechanism that would allow a species with a naturally short lifespan to live longer through cannibalism?

There is a humanoid species whose natural lifespan/period of senescence is very short compared to other sapients of the setting(around 20 years). They have similar levels of intelligence to humans and ...
2
votes
3answers
124 views

What's the darkest/lowest albedo rock that can predominate a planet's surface?

Earth has a bond albedo of 0.3, Mars (presumably because of fewer clouds) is 0.25, and the moon comes in at 0.12 (which is darker than it seems from Earth). Water has a very low albedo, but clouds ...
4
votes
5answers
1k views

Evolutionary pressures for carnivorous elves

In a fantasy world I am creating, there exists a race of elf-like hominids that exist along side other races in this world. Note the "elf-like" portion as while they do have: Pointy ears (...
5
votes
4answers
748 views

is it possible in a given world to ride a triceratops and so how would it work?

I've been thinking about this world that's been in my mind and one of the things in it are drake knights which are warriors who raised and ride domesticate breed of triceratops like the war elephants ...
-1
votes
1answer
93 views

Explaining Deathwatt

The Atomic Deathworm. An interesting concept, one I adapted. Living in sand is not likely for a worm, unless, of course, that sand is near or in water-plenty of worms live in wet sand. However, ...
2
votes
1answer
229 views

Effects of a creature longer than Jupiter getting too close to Earth

So basic introduction: my world has things which naturally should never exist due to seemingly violating certain laws we deem as natural, for this, let's just call them "anomalies". Among ...
2
votes
2answers
71 views

How Feasible are Weaponized Wings for Flayt?

Flayt, like Viji, are a race of anthropomorphic creatures, most resembling birds and around the size of a human. Back when I first imagined them, Flayt were essentially giant birds, with spotless ...
4
votes
1answer
94 views

Design of a scythe bicycle?

In ancient times, scythe chariots were all the rage. Sporting meter-long blades, they were a terror for primitive warriors. I presume that means that, unlike in bad Hollywood movies, the scythes ...
3
votes
2answers
99 views

What is the extent of inertia manipulation powers?

To my understanding, inertia is an object's resistance to change in motion, i.e. something with high inertia is more difficult to start/stop, and something with low inertia finds it easier to start/...
3
votes
4answers
148 views

Manufacturing and interchangeable parts in a pre industrial world

Let’s assume this is a society that has some knowledge of advanced technology but is currently in the 16/17th century politically and technologically. How would a society before the industrial ...
5
votes
4answers
308 views

What would the local effects/affects be of a ring spinning near luminal velocity?

To better solicit more inline with what I'm trying to imagine, I'm editing my question, the original question is left below and removing the hard science tag, as that just seemed to cause issues, ...
3
votes
3answers
116 views

Would life be possible on a planet whose poles each directly face the sun once a year?

There is a kind of planet that I'm curious about regarding its habitability. Basically it's a planet that's very earth-like as far as its mass and material and atmospheric content and rotational/...
21
votes
8answers
4k views

What happens to my candy-creatures when they get wet and how do I stop it?

Dilithoids or as I call them candy-creatures are the lowest animals on the food-chain on my arid alien planet. What distinguishes them from other alien fauna is their simple body plan and their ...
0
votes
5answers
187 views

Is it realistic and legal for someone who lives remotely in the UK to have a private mobile repeater?

Edit: Question has been edited due to confusion and details have been clarified on why they need a mobile signal. I'm currently writing a short story and have the idea that someone that lives in a ...
1
vote
1answer
75 views

How far away must a tidally-locked planet be from its star for the side facing the star to be lush?

I've been wondering if it's at all possible for a habitable tidally locked planet to not be a scorched wasteland on one side, an oasis in the twilight, and a frozen wasteland on the other, the planet ...
2
votes
2answers
71 views

Biblaridion's equation for making a star based off its luminosity

I have searched for at least 45 minutes and I can't seem to find it. If you don't know what I'm talking about, in Biblaridion's first Alien Biospheres Video, he mentioned the you could calculate a ...
0
votes
1answer
140 views

How large can a human or animal get? [closed]

Many legends and fables contain giant humans and animals that terrorize the people. Usually these beast are about 10-21 feet or 3.048-6.4008 meters. But in some pieces of literature, these humans and ...
2
votes
6answers
171 views

How to prove that the source of a signal is truely alien

A device is recovered from an impact site in the desert. This device contains bizarre, but not inconceivable, components and a simple interface. The interface is a black and white touch screen with a ...
5
votes
4answers
509 views

Eye size and pupil shape of an over 6ft tall ambush predator?

They're built in such a way that they can stalk and chase their prey on all fours like a feline can, and then easily return to digitigrade twoleggedness for everything else in their life (this is a ...
9
votes
4answers
2k views

I'm making a tattooed repository of paramedical knowledge for a religious ceremony. How small can words be if they're tattoos made of cremation ashes?

I have a character. One of their parents died. Said parent was cremated, and then - by their own choice; this is a quasi-religious thing - their cremains were mixed into tattoo ink, and the character ...
5
votes
4answers
167 views

Could these dragons participate in the economy?

The mule-dragons are a rare but extremely powerful type of dragon. They have a supernatural ability to seek out and hoard expensive shiny stuff like gold, silver, and precious stones, which they do ...

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