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For questions that require answers based on hard science, not magic or pseudo-science, but do not require scientific citations. Consider, alternatively, the hard-science and reality-check tags. Avoid using this tag as the only tag on a question.

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Is it possible an ice line from pole to pole in a tidally locked Earth-like moon?

I am aware that there are a lot of answers explaining the fundamentals of a tidally locked "Earth-like" moon around a giant gas planet. For example this one: Habitable moon of a gas giant: working out ...
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0answers
9 views

Increasing structural integrity on Phobos, is it possible?

In Warlords Phobos is comparable to Ellis Island for Mars with its surface being home to many decent sized colonies and space ports (making use of the close proximity of Phobos to Mars) that ...
3
votes
1answer
40 views

How many dead bodies are required to stain a river red?

Historical accounts of battles sometimes talk of rivers running red with the blood of fallen combatants. Many Lancastrians were killed while fleeing; some trampled each other and others drowned in ...
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2answers
64 views

Roller skating powered armor?

One common problem with powered armors is their limited endurance. This could be remedied with electric roller skates as an efficient and faster way of locomotion, capable of maintaining its speed ...
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2answers
58 views

How would we overcome the sinking problem as sediment builds up around urban areas? [on hold]

As sediment builds up over the earth, it is compacted into layers of rock, which can be seen in the geological record. However, urban areas typically have good maintenance which washes away any ...
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2answers
470 views

Spaceship Emission Security

In my military scifi novel the military is, obviously, very concerned with security aboard its spaceships. They don't want other people to be able to receive any information about what happens on ...
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1answer
76 views

Peeping at Antipodes: How long would it take to peek around the sun using modern technology?

Assuming humanity was suddenly highly motivated to do it, how long would it take a probe launched from Earth to get into a position to record and broadcast images of the position in the opposite orbit ...
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3answers
108 views

Could the genetic makeup of two parents theoretically combine just right to make a superhuman, or at least semi-superhuman child?

Basically I want my character to have only gotten their powers through the luck of two parents with the right genes mixing. Technically, given enough time and enough generations of breeding, couldn't ...
16
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6answers
4k views

What does a solid, 1 mile diameter subterranean glass sphere look like?

There is a solid glass sphere that is 1 mile in diameter. It is completely covered in dirt and rock, except for one small room that is built adjacent to the sphere. One of the four walls of this ...
4
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4answers
91 views

Applications of Electromagnetism in “Force Fields”

Lengthy Explanation of Why I'm Here: TLDR; "force field" made of electromagnetic radiation. Recently, I've decided to compile a list of possible technologies available in the 22nd and 23rd centuries,...
29
votes
9answers
4k views

How long does it take to build a medieval city wall?

There is a medieval city that, for multiple reasons, doesn't have any kind of structural defense, but they decided to build a wall now as there is risk of a war in the bordering kingdom, which can ...
3
votes
1answer
66 views

Fantastic gas, part 1: could a gas be 'polluted', 'rarified', or otherwise react negatively to electricity, excluding methane-like explosions?

I previously asked a broad enough question about designing a fictional gas but it was advised by two users to split it into smaller questions. So here I am. The main property I want this gas to have ...
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12answers
6k views

How would a child with a thousand years of experience behave?

Here's one to ponder: what would an immortal eight-year-old be like after one thousand years? In most stories involving immortality, the immortals are fully formed adults. When those stories do ...
2
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3answers
131 views

Making a 180 degree turn around a star

For a book under construction, I need a starship to make a 180 degree turn rather quickly. Give him sub-light speed in a star system (no relativistic effects) and on a path to the system primary. I ...
17
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9answers
5k views

Why build underwater outposts, rather than ocean-surface settlements?

Suppose we've colonized a planet with 99% of the surface area covered by oceans. It has submerged continental crusts, averaging 200-500m underwater, with the average depth of open ocean being 1000-...
1
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1answer
43 views

Climate controlled Domed over island, is it feasible?

In Warlords Ganymede has been terraformed to a state like the artic circle with it's tropics being like Iceland (this is assuming that Ganymede would have tropics) The rich and affluent (as well as ...
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1answer
91 views

What if a spaceship with an Alcubierre Drive crashed?

Exactly what the question says. What if a spaceship the size and mass of a space shuttle with a full fuel, that has an Alcubierre Drive on it crashed into the Earth at 8 km/s? ( And no, I'm not ...
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1answer
31 views

Under what conditions would we see fungi dominating the surface of a planet? [duplicate]

Fungi are generally decomposers, but I've heard of fungi which can digest rock, and that such fungi were on land before plants and that their rock-digestion is what made the soil livable for plants. ...
20
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12answers
3k views

Other than tentacles and jointed digits, what methods of holding items are there that provide similar dexterity?

I'm trying to envision a creature that is highly dexterous, and adept at using tools, but every time I try to think of a possible grasping appendage, the only two I come up with are either tentacle ...
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0answers
43 views

Universal Language [on hold]

I've developed a universal language driven by mathematics but with tangible meanings. My question is how would one then use this to develop a plot in a fictional universe. There are four quadrants to ...
-4
votes
2answers
178 views

The Best Arsenal : The Best Assault Rifle [on hold]

I am trying to learn from my past mistakes on asking for too much at a time, while asking for the wrong things, and often forgetting about crucial details. So here I am, in my quest of finding the ...
-3
votes
1answer
71 views

Deadliest Possible Small Arms [on hold]

Before I continue I need to clarify a few things. First, by small arms, I mean any weapon that can be used by infantry. Now time to define Steve, our guinea pig for this question. Steve is 30 years ...
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2answers
74 views

Mass Human Cloning - Could it be feasible?

Exactly what the title says : Could mass human cloning be feasible? I have a two criteria : Clones must come out as adult Cloning process must take a maximum of 3 months Optional : Clones must be ...
16
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8answers
2k views

How could humanoids master forge fire without using vegetal materials?

I'm building a fantasy world with a humanoid species (basically, "elves") which refuses to use dead wood. Context They don't use dead wood because they don't want to. Consider that trees are sacred ...
4
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3answers
154 views

How far can civilization go without inventing the calendar?

While only counting seasons and years, but not weeks or months, how far can human civilization progress? Can they reach the middle ages? Or is the invention of the calendar such a cornerstone of ...
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0answers
53 views

Would a Metallic Glass Mirror Differ From a Regular Mirror? [on hold]

There has been talk lately of turning glass into a metal, thus creating a material that would have greater strength than regular metal, not to mention the ability to store and release elastic energy. ...
5
votes
5answers
167 views

How might a medieval fantasy/magic-using society state the 2nd law of thermodynamics?

If a medieval-level society with access to things like magic (which itself follows the laws of thermodynamics) were to have some understanding of the laws of thermodynamics, how would the 2n law be ...
6
votes
1answer
220 views

How high could a Lego tower be?

I just won the national lottery! I am a billionaire, and can do whatever I want with my money! Tv interviewer asks me what would I do with this money. Then, come the Idea. I remember this guy when I ...
8
votes
8answers
263 views

'Magic' regeneration without breaking the 2nd law of thermodynamics

In designing a hard magic system, I would like to keep things consistent with the laws of thermodynamics (as many do) since, if I don't, I fear I may accidentally create a way for mages to create ...
5
votes
1answer
113 views

What was the weather like in the Eocene?

I was reading this question earlier today. It asks about the characteristics of global winds in a modern-day earth with Eocene-like temperatures. I'm here to ask about other kinds of weather in the ...
13
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22answers
4k views

Plausible hypothesis on why gravity might fail on earth

I've been grappling with a story for a while, involving a scenario where gravity starts to fail. The goal of the story is mostly how people react to the knowledge that the world will end. But, I also ...
9
votes
4answers
219 views

How would a permanently cold tower affect its environment?

In my world, physics works exactly like on Earth, except that there is a narrow, 400 foot tall magical column sticking vertically out of the ground, which is magically always extremely cold -- I'm ...
3
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2answers
45 views

Can tablelands produce a rain shadow like mountains do?

In my world I have a region of desert, bordered on the east by the steep cliffs of a tableland or plateau. The plateau slopes gradually down to the east coast of the continent, a distance comparable ...
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2answers
134 views

Evolution: Tilting the scales of the arms race between cobras and mongooses

Often times a mongoose will prefer easier prey than a cobra. However, getting down to brass tacks, should the two fight, it's fairly axiomatic that the mongoose takes the win the majority of the time. ...
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votes
1answer
84 views

What rules govern which biomes can neighbor one another?

I'm working on a map of a single continent or large island, and I want it to have some distinct biomes. What are some simple rules to determine which biomes could possibly be near/adjacent to one ...
11
votes
1answer
110 views

How could an Earth-like planet develop huge pinkish-purple forests on ocean surfaces?

I'd really like to write a story taking place on an alien world that involves a totally new kingdom of life, and I'd like it to be at least somewhat realistic. The idea I have right now is a whole ...
0
votes
3answers
116 views

What could a person able to re-arrange their muscle strength accomplish?

Suppose there is a type of person who is otherwise a normal human, but can temporarily transfer muscle strength from one part of their body to another. Whether this occurs through mutant genes, ...
4
votes
1answer
105 views

climate and behaviour of a gaseous ocean

Following up on my last question about the ecology of my skyworld here, I decided to go more in-depth and fundamental. This is going to mostly be about the behavior of the ocean and changes to the ...
24
votes
6answers
5k views

How to build a Blood Gun?

I recently played the game Mary Skelter - Nightmares, in which the protagonist after some time acquires a weapon that is called a Mary Gun - a device that shoots his own blood. I'll change the ...
4
votes
3answers
159 views

How plausible is molecular disequilibrium from Ant-Man and the Wasp?

So if you haven't watched the film, basically there's this one character who suffers from a (fictional) condition referred to as “molecular disequilibrium.” As described by the character, it's a ...
2
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3answers
194 views

Blackholes as Perfect Recyclers or Perfect Batteries: Safe storage, recharge, and usage

Consider the facts that a blackhole: Eats everything that passes through its event horizon. In layman's terms, it is defined as the shell of "points of no return", i.e., the boundary at which the ...
8
votes
8answers
1k views

To Conquer the Earth by Appearing Ship

An alien species has been conquering planet after planet around the Milky Way for some time. They detected intelligent life on Earth a while back and now they decided it’s time to add us to their ...
5
votes
2answers
190 views

What is the best body plan to allow for giant size in a terrestrial animal?

My question is rather simple; assuming optimal atmospheric and planetary conditions, what body plan would be able to support the largest plausible land animal? To split the above question into a ...
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votes
1answer
131 views

Carrying out Self replication of humanoid to create versions of itself

Premise: I have a character that is trying to replicate himself into offsprings that will accomplish his task. He is a major character with immense levels of power/energy. My character has to create ...
7
votes
4answers
206 views

The plausibility of tungsten reinforced steel Composite Metal Foam (CMF) as body armor

Hi everyone I would like to ask if this material is suitable to be used as body armor like kevlar, as I am planning to use them as armor for my novel. What are the drawbacks to this? Could the armor ...
10
votes
5answers
492 views
+500

An Inverse Great Dying

252 million years ago, the worst event in the history of life on Earth occurred. 70% of all terrestrial species and 96% of all marine species became extinct through, according to geological records, ...
0
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1answer
62 views

Formulating likelyhood for civilization to face weapons-based self-destruction [closed]

Premise I would like to create a formula that tackles the question of how likely a civilization is to commit self-annihilation. At first glance it doesn't sound possible or practical for that matter. ...
-1
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1answer
103 views

Accuracy of Machine Aimbots

The evil professor Mr. GLOOPbar has built a base IN SPACE 2 years ago in 2016 with the best contemporary technology. His base is ran by a Artificial super intelligence of unfathomable intelligence ...
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0answers
59 views

What to use as transport while crossing a region of permanent storms? The region is used to run from a dark lord into a refuge without raising alarm [closed]

There is a region that sees never ending violent and hot dust storms, on the lines of the red/white spots on the Jupiter. It is desert-ish and stormy in the extreme. What could be possible modes of ...
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votes
2answers
77 views

If animals were equipped with AI what would separate them from humans? [closed]

So the argument against sentient robots is that no matter how intelligent they are they they cannot be conscious because conciousness is linked to our biology. But animals are conscious, expereince ...