Questions tagged [science-based]

For questions that require answers based on hard science, not magic or pseudo-science, but do not require scientific citations. Contrast with the hard-science and reality-check tags. Do not use this tag as the only tag on a question.

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2answers
208 views

What Would the Arctic Ice Caps Look Like in This Current Map?

This is a map of my alternate Earth with a focus on ocean currents, courtesy of Mikael Asikainen: As you can see here, Greenland looks smooshed, but that is because it is arranged to the extent that ...
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12answers
4k views

Earth is invaded by miniature aliens - can they win?

Background Intelligent aliens have invaded Earth in 2024. Unfortunately for them they miscalculated. From watching our TV, they thought we were the same size as they were. Each alien is about 1 ...
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1answer
103 views

Depth and Temperature of Polar Underground Cities/Tunnels

Assume an underground city existed below the surface of Antarctica. The ice sheet is ~2 miles thick on average. At what range/depth would the earth's thermal heat allow livable temperature for humans, ...
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3answers
183 views

Ice moons and giants? That close to the sun?

As a world builder I like to make solar systems and sometimes when I see an interesting idea I can’t help but wonder could that actually work that way? For an interesting example here is a clip from ...
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3answers
124 views

A way to measure the complexity of a material/substance?

I'm trying to create a magic system through which a person has to understand a material/substance so they can locate it around them, and eventually manipulate it in other ways. I tried something like ...
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3answers
2k views

Can my vampires evolve black sclera?

I’m in the process of making my own original series where I have all types of biologically feasible cryptids and monsters in it. In this series, I’m planning on having vampires being a species that ...
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2answers
125 views

A dense and reliable data storage for human brainscans?

One idea, I like to think about, is resetting the world as a plot point/twist. As this is a soft-reboot that restores the planet to the last known savefile, I think I can handwave most of it with ...
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1answer
58 views

Would This Chosen List of Animals Occupy the Earthworm Niche?

To say that the earthworms are essential to the health of the planet Earth would be a gross understatement. So much so that there is no way that I can list you all their benefits at once. But what ...
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9answers
5k views

What is the largest 'hollow' space structure that can be created?

After reading the following question about anti-gravity, I wondered what the largest hollow structure you can make in space is. None of the questions about hollow earth seem to answer this. To put it ...
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8answers
701 views

How to realistically explain antigravitation?

When designing something really big, which can be compared in size with at least a planet, one problem seems to be unsolvable. The problem is how to fight the gravitational force that will collapse ...
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1answer
97 views

Shipping Ganymede to Venus [duplicate]

So assume someone wants to terraform Venus. And for extra points the decide to get her a moon too. So, how could you get Ganymede to Venus with as little effort as possible but also as fast as it can ...
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3answers
339 views

How Would a “Lungshark” Breathe Out of Water?

Allow me to introduce to you the epaulette shark: This one species stands out over the other 511 in that it can breathe out of water. How? It actually has several adaptations: They slow down their ...
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1answer
126 views

Are people taller now than they were in the 1200's? If so, by how much? [closed]

I've heard from several sources that people used to be a fair amount shorter than they are today because they didn't have a very well-rounded diet but I can't find a credible source that might help me ...
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6answers
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Adapting humans to be more likely to survive gunshot wounds?

So, I was thinking. Modern combat relies a lot on intel and speed, but also luck. Now there is a problem. You see, in most video games, even hardcore ones, like Lobotomy Corporation, there are certain ...
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5answers
237 views

How could we (modern humans) colonize a hot planet?

Consider a planet similar to Mustafar (of the Star Wars franchise). Ambient temperatures and pressures are nearly 400 Celsius and 80 ATM. A surviving crew of normal humans is running out of resources ...
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1answer
159 views

To what degree can a human's perception of pain (or suffering) be increased?

Suppose we have some form of malevolent superintelligent AI (or whole brain upload, or alien, etc.) Assume that this entity intends to do everything in its power to optimise for the pain and/or ...
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3answers
180 views

outside of cold working method, is there other methods to forge metal that constantly below sub zero temperature?

inspired by this question How devastating is a weapon that can internally and rapidly cool down a section of a human body?, i wonder what kind of blacksmith method to forging or smithing a sword or ...
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5answers
236 views

How could a small group pre-apocalyptic people prevent the breakdown of an advanced nuclear-based power source generations later?

I've been toying with the idea of a world that was once hyper-technological, where body modification and nanotech-based body modifications were the norm such that society practically couldn't function ...
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2answers
128 views

Variations on the “Ginsu Shark” Theme--What Would They Eat?

From 108 to 73 million years ago, the shallow seas of North America, Europe and southwestern Asia were the haunt of four species of a genus of shark scientifically named Cretoxyrhina. The chosen ...
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1answer
170 views

Starting ingredients for perpetual pit of snakes

I want to ensure that my burial tomb is guarded by a pit of snakes for all the ages, similar to that featured in Indiana Jones (Raiders of the Lost Ark). Initially, I thought I could have an ecosystem ...
5
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2answers
178 views

After a major nuclear war/disaster, how much radiation would remain after ~300 years?

The setting for my story is a post-post-apocalyptic Earth. There was a nuclear war (and several related nuclear disasters due to power plants being either targeted or neglected), and it's already been ...
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8answers
2k views

Are there advantages to using a quad-treaded/split tracked system for a vehicle?

All real military ground vehicles use a continuous caterpillar track or tank tread, but quad-treads/split tracks are often seen in sci-fi, with their futuristic tanks and settings. (Halo scorpion, C&...
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3answers
112 views

What RESOURCES, NOT ART, NOT GOODS, are worth shipping in space? [duplicate]

In space, what resources, are worth acquiring from one part of space, and sending to another?
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6answers
194 views

What resources would space traders trade, assuming a gate network but no other FTL exists?

So our world you have wormholes, they aren't "tunnels", just "doorways" of sorts between two systems. The network connects a small portion of our galaxy, some 500 solar systems in ...
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0answers
50 views

How would a civilization on a planet with 1/10 Earth gravity look like? [closed]

I have a lot of book ideas, and one of them is set on a planet with very low gravity. It has the same size as Earth, but with 1/10 the density. It has no satellites. How would the lifeforms be ...
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2answers
137 views

The 42-Hour Day: Episode I: Ocean Currents

Presented here is a map of an alternate Earth from 542 million years ago. It is 5% narrower in diameter and 20% lighter in mass than our Earth. A single day lasts 42 hours, a cycle that it must ...
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10answers
3k views

How to Salvage From a Sunken Spaceship

This was an idea loosely inspired by a Sci-fi movie that I will not name here. But the relevant part is that it involves an interstellar colony ship landing on a planet and the crew learning that the ...
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2answers
169 views

Identify the physiological health obstacles to humans residing in a 540 fathom deep sea colony at ambient pressure with a specific air mix?

Deep sea colonization has been dreamt of for nearly a century now but most approaches, such as the recent movie Underwater rely on maintaining the colony at 1ATM rather than circulating mixed gas at ...
5
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0answers
95 views

Metallic Hydrogen vs. Nuclear Thermal Propulsion [closed]

I'm trying to design a spacecraft (only 100-150 years in the future) that will carry a crew of astronauts (probably ≤10) on an extended mission through interstellar space (they have some sort of hand-...
2
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4answers
378 views

Reasonableness of Micropiles

In a few of Isaac Asimov's stories, including The Martian Way, he uses water as a reaction mass to provide sub-light travel, and he mentions that the water is heated using "micropiles". ...
4
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3answers
157 views

can bacteria or microorganisms produce or excrete blood?

my question is inspired by @Renan comment in this question Can a naturally occurring milk river exist? and so i think i want to incorporate it for my blood river from my old question what organs or ...
5
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1answer
142 views

What are the risks and consequences of colonizing an inhabited Earth-like planet?

The planet I have in mind has an abundance of plants and animals, but no sapient species or civilizations (think Earth before humans came along). Wouldn't Earth micro-organisms wreak havoc on alien ...
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5answers
354 views

Invading a universe made of absolutely nothing

Background Parallel universes where the cosmological constants are different to ours have been hypothesised. Most of these would presumably lead to a chaotic mess. The observed values of the ...
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2answers
260 views

If people were inside the detector of a particle collider during a collision, what would happen to them?

I am aware of the accident when a physicist had a particle beam go through his head, though information on how that happened is scant except for a "safety measure fail". I am trying to build ...
4
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3answers
193 views

Humanoid avians with six limbs, how to modify their bodyplan so that their ribcage won't constrain certain movements?

Thundercats 2011 was great. I mean, it even had Thanos and infinity stones before it was cool. Such a good remake simply couldn't survive in final-stage capitalism, as those who worked on it didn't ...
7
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3answers
113 views

Emitting a particle beam within the atmosphere

In particle accelerators, particles are typically accelerated within a vacuum (or as close to it as possible) in order to minimize interference and collisions with air molecules during the ...
7
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2answers
151 views

Is it possible to create a new hybrid species of the homo genus that can produce offspring?

I have read about hybrid speciation: "speciation where hybridization between two different species leads to a new species, reproductively isolated from the parent species". I wanted to know ...
4
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4answers
166 views

Technology is Magic: how do I explain the lightning-fast transportation/deployment of conjured troops?

Though it's probably bad for originality to use D&D and Lobotomy Corporation as basis for my world, I doubt there'd be any left of the former by the time I'm done with it. Things like ...
8
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4answers
152 views

Minimum tech for agricultural desalination

I'm trying to figure out a realistic setting that depends heavily on desalinating sea water for desert agriculture. Specifically, I'm trying to figure out exactly how early in the tech tree, this can ...
4
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1answer
315 views

What happens if I shot a blackhole pellet point blank at someone?

Imagine I had a sophisticated gun that is capable of producing a micro blackhole on contact with a target, that blackhole is designed to be completely evaporated as hawking radiation in exactly 1 ...
2
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0answers
53 views

How long would daytime and nightime be on a planet with a 26 hours rotational period? [duplicate]

The basics about the planet in question: As the second planet in the star system, it's somewhat warmer than Earth is. The rotational period is 26 hours and the orbital period is 312 days which ...
6
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9answers
1k views

Can a naturally occurring milk river exist?

Is it possible without magic? Just like our world's rivers, but instead it's a river made out of milk.
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3answers
295 views

What kind of organs, anatomy or modifications are needed for my alpha creature to mind control its kin?

I want to make a biological group of creatures where there is an absolute alpha creature that their lower kin cannot ever harm due to a mental prohibition. This would be equivalent to Asimov's first ...
5
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1answer
123 views

How to Terraform a Dead Earth

In the foreseeable future, a scientific community has discovered an alternate universe in which the solar system centers around a binary system of G-type suns, unlike the one G-type that ours orbits. ...
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7answers
1k views

A human civilization genetically altered themselves to specialize in certain roles, why would it be naturaly undone after said civilization vanishes?

Architects were a rather weird civilization. You see, not only did they create servant races like demi-humans, but had also engineered themselves to be specialized in various areas. Here is the ...
5
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3answers
133 views

Giant rift with lava at the bottom

I’d like to consider continental rifts on massive scales. I’m trying to imagine one about the length of California that is so deep, a long “river” of lava flows along its length. The rift walls ...
5
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4answers
204 views

How to make dragons move stealthy on radar?

What dragon exactly? Well, the ones in my story tend to be "smaller", around the size of a larger horse with wingspans of 10-12 meters. They have six limbs and are capable of powered flight. ...
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2answers
227 views

Hypothetically or Theorethically can ancient to medieval periods technology make non biodegradable plastic bag?

To make it clear, I mean the period or timeline, so this include the entirety of the world during up to 1500, not just specifically the technology of ancient/medieval Europe, ancient/medieval Japan, ...
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20answers
10k views

Could you run a CPU at a much higher speed, as a disposable item?

I have a magitech system where instantaneous processing power is much more important than long term processing power. In my world, magic is cast by using compute power to communicate with a ...
8
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4answers
256 views

Plants Without Air

On a distant world, the atmosphere is different than ours - there is no oxygen but a high level of C02 like on Mars or the early Earth. This planet is otherwise similar to Earth but slightly warmer. ...

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