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 because it describes how the question should be answered, not the topic.

Filter by
Sorted by
Tagged with
3
votes
1answer
95 views

What would the atmosphere of the Archaean Earth look like? (Before massive oxygenation)

I am designing an exoplanet in the Alpha Centauri system that is remarkably like ancient Earth before photosynthetic life developed and proliferated oxygen into the air. For Archaean Earth's ...
3
votes
3answers
158 views

Is my Bioluminescent, Four-legged, Bat Creature Possible?

Note, all animals are actually only Damarian equivalents of the animals named, except for my question creature. My world, Damarian (Found in my newer posts), has a species of obligate carnivores, ...
1
vote
2answers
58 views

Feasibility of Capturing high energy atoms and energy in electromagnetic wave in cosmic rays, how to implement near planets?

I read this question about feasibility of capturing hydrogen from the Solar wind a while ago. Hydrogen in solar wind was exploited in that discussion. Here, does cosmic ray often close in towards a ...
26
votes
10answers
4k views

Why would vampires require human blood?

In my world, vampires need to consume a small quantity of human blood every month to survive. They usually supplement their diet with animal blood and human food. A vampire which goes without human ...
7
votes
5answers
474 views

Measuring local orbital parameters with a smartphone from the surface of an unknown planet

My protagonist is stranded on an alien planet. Fortunately, along with ready supplies of food, shelter, water, electrical power, etc. she has a functioning high-end smartphone. She uses this ...
6
votes
5answers
294 views

How Can a Creature With Focus Come to Exist?

Background: Alendyias is a world that was formed inside the Fracture of Reality, one that is still forming as the Fracture in Reality grows and absorbs other worlds in its path. Absorbed worlds and ...
18
votes
23answers
6k views

Why wouldn't a space fleet use their lasers for a precision strike?

You are the admiral of a fleet of warships in orbit around Saturn (EDIT: the individual ships can be anywhere in the Saturnian system, including into Titan's orbit), tasked with performing a precision ...
3
votes
1answer
89 views

Is a dense CO2 atmosphere compatible with an ocean

As part of an ongoing effort to update a planetary classification system for sci-fi settings, I'm trying to nail down if an old idea for an exotic type of life-bearing world is actually plausible and ...
1
vote
0answers
33 views

Why shouldn't I use lasers or lightsabers if I have Light Powers? [closed]

In this world,these humans have the ability to control energy.Specifically, to transport energy someplace else And/or converting it. Someone can have a very good range of where this ability goes.And ...
5
votes
2answers
76 views

Would Dragon scales made of similar material to Limpet teeth work?

So I need some help as I’m in the process of creating dragons and I was given the idea of using the material that limpet teeth are made of for dragon scales which in theory should make them extremely ...
9
votes
1answer
229 views
+250

What blood pigment type is immune to ammonia poisoning?

I am designing a world in which the biological solvent is an ammonia-water mixture and need help finding out which blood pigments (Hemoglobin, Hemocyanin etc.) would be immune to the negative effects ...
7
votes
4answers
139 views

Would it be possible to have an earth-sized planet have much larger tides while remaining habitable?

I want a planet with roughly the same mass and volume of earth to have tides on a much larger scale than earth, enough that the coast would be extended for at least several hundred feet at low tide in ...
11
votes
4answers
1k views

Would nomadic mermaids be capable of domesticating fish that they herd?

In my world, most mermaids migrate and have two family groups: A warm-water group and a cold-water group. When the water is cold (winter) the mermaids move down south to warmer waters. There the ...
7
votes
22answers
5k views

How to prevent guns from working?

I'm writing a story where some agents are sent to a small town in the 80s and must work out what is going on there. However, there are no guns in the town and to prevent the agents from having an ...
2
votes
0answers
44 views

If were creatures obeyed the physical conservation of mass, what animals could they easily change into from people in their natural range? [closed]

In my world, all animals can have a were equivalent. The requirements are that they must have blood and that they cannot change mass. However, that's not necessarily a limit when it comes to the ...
5
votes
2answers
88 views

How to design a Venusian plant?

I want to design a plant-like organism that floats ~50km above the surface of Venus, where the conditions are somewhat Earth-like. I envision it to be a large photosynthesizing balloon on a very long ...
6
votes
2answers
671 views

Could [life on] Earth Survive a Gamma Ray Burst?

[EDIT: this question is about life on Earth surviving, not the physical destruction of the planet] Could the Earth survive a gamma ray burst if that burst occurred in our galaxy and the Earth is in ...
6
votes
6answers
740 views

Orbital Bombardment of Airships

Imagine that you're the admiral of a fleet of warships in orbit around Saturn. You need to capture targets on Titan, the largest moon. (This could also be applied to, say, Venus or one of the gas ...
8
votes
3answers
165 views

Anatomically correct Shadow People

What would a realistic space-dwelling humanoid species under these guidelines look like? It's for a setting I am working on. They are sentient and live on asteroids, typically converted into ships. ...
9
votes
1answer
552 views

How practical would war boars be?

along with horses, Orcs have also bred giant Boars which they ride to battle. these war boars have been bred to be the size of Entelodont with larger tusks and I was wondering in what field might ...
7
votes
3answers
724 views

Ideal large flightless bird for domesticated* cattle [closed]

Ideal large flightless bird for domesticated cattle So, just to be clear, when I mean "giant birds", I mean the families that presently consist of giant flightless birds (think moas, emus, ...
4
votes
3answers
188 views

How to ensure the complete destruction of a body in a warfield?

A commando expedition is sent to country A. The fact that they come from country B must not be known in case they are caught in country A. In order to do so, they need to have a portable way to turn ...
0
votes
0answers
33 views

Ideal large flightless birds for domesticated* cattle [duplicate]

Ideal large flightless birds for domesticated cattle (Just a note about this question being a duplicate. Some of the points people raised on a basis to close the question were fair and some... weren't....
4
votes
4answers
755 views

What vegetation/biome could I expect in a tropical region at an average temperature of 8-9 degrees Celsius?

So, my climates are extreme due to a 31.1 degree axial tilt. The maps provided show a climate classification system based on prevailing winds and elevation. Based on Reddit user u/shagomir's Planet ...
11
votes
2answers
2k views

What would make a plant's leaves razor-sharp?

Imagine a field of plants that when walked through cuts human skin. Unlike a Stinging Nettle, the leaves would have to have razor-like edges, without the trichome hairs. The leaf edges should cause a ...
7
votes
5answers
1k views

Could a mechanical bird with the wingspan of Vermont be able to fly?

I know it sounds kinda stupid, but I’m trying to create a really ominous figure that would always watch the player in this a hypothetical video game that I’m writing with my dad. We both agreed that ...
4
votes
8answers
518 views

The Source of Gravity Based Destruction

The Background: It's the year 4000 (or whatever), and mankind has cheated FTL travel. As a result of this 'cheating' rather than solving, however, they can't easily go beyond their borders. However,...
5
votes
4answers
152 views

How would a civilization protect a Dyson swarm from solar flares and coronal mass ejections?

This is the first of two questions. Same introduction. A civilization on Earth has just begun expanding with a Dyson swarm, which is a Dyson sphere but made with many satellites, to prevent structural ...
7
votes
2answers
120 views

How to Build the Fictional Continents Using Our Real Continents

Presented here is a map of Earth with the fictional continents resurfaced, by the Redditor "Stagman1111": Source From left to right, the presented additional continents are Mu, Atlantis and ...
3
votes
1answer
66 views

Dyson swarm and Coronal mass ejections - generating electricity

This is the second of two questions. Same introduction. A civilisation on Earth has just begun expanding with a Dyson swarm, which is a Dyson sphere but made with many satellites, to prevent ...
19
votes
6answers
2k views

How would a fruit causing longevity be identified as one?

With current (early-21st century) technology and science level, suppose that a new fruit is discovered on some island. This fruit is imported and marketed around the world. Unknown to anyone, this ...
13
votes
5answers
1k views

Creating a scientifically semi-valid super-soldier, part 2: nervous system

Part 1 here: Creating a scientifically semi-valid super-soldier, part 1: Skeleton This question is about a complete rebuild of the nervous system. The question as proposed here: Improving human ...
-1
votes
2answers
153 views

Proving to the past that I am from the future [closed]

Let's say I've been able to travel in time and I am back in the past (just by a few years or even centuries). I do not have any modern gadgets or even modern clothes, just me and my 21st century mind. ...
5
votes
1answer
60 views

Movement Features for Tree-Dwelling Prey Animal

I am currently creating a small creature about the size of a squirrel. It lives in the trees and eats fruit. It is the prey of a cat-like creature that has a prehensile tail and is agile and can run ...
5
votes
6answers
395 views

How do you keep a medicine's effect isolated to a particular body tissue?

In my world, a newly independent Mars established incentives to draw in scientists, engineers, and academics. Brilliant people flocked in from around the solar system, to fill high-paying but very ...
17
votes
17answers
5k views

Allow interstellar travel but not intergalactic travel

I would like a technology which makes interstellar travel possible but not intergalactic travel. I came up with a rift field which compresses space-time proportional to field density. This rift field ...
2
votes
1answer
40 views

How to stop genetically modified bacteria from creating a catastrophic greenhouse effect?

I'm here on behalf of the Antarctic People's Liberation Front. Some call me a terrorist, but really, I'm just trying to build a better life for my people. Earth is a beautiful place, full of bright ...
3
votes
2answers
101 views

What POD Would I Need For Earth's Lost Worlds to Exist Today?

This is a map of Earth as depicted by the DeviantArtist ToonHolt: As you can see, many new landmasses have been added, from lost worlds like Sundaland, Zealandia and Kerguelen, to fictional worlds ...
1
vote
0answers
80 views

Fusion Orion Drive

Orion drives are awesome. Nobody can deny that. They are however a little outdated and still use pure fission pulse units. Obviously they are in need of an upgrade! A good place to start would be ...
4
votes
3answers
227 views

How would one hack a battleship in space warfare?

Note: I might have put way too much information here; I've bolded the most important things. Okay so here's the situation (this is the context in story; I'll bold the actual question): the Solar ...
0
votes
2answers
94 views

Plausibility of a plastic/polymer at least as dense as iron for applications requiring high density

I've had a high fantasy/fictional universe building up in my head for years, however it's timeline extends much further beyond the classic middle ages, going up to modern times and having it's own ...
0
votes
6answers
1k views

Anatomically correct succubus part 2: the diet

Instead of the whole egg laying parasitic vagina concept, which was the leading idea in the original question. Assuming the succubus is purely the whole woman like creature. Can she gain enough ...
5
votes
2answers
77 views

Energetics in a reducing atmosphere

I am working on a speculative evolution project, which takes place in a reducing atmosphere consisting mainly of methane, nitrogen gas, hydrogen gas and carbon dioxide, along with liquid ammonia as ...
2
votes
1answer
64 views

What would it look like if an artificial atmosphere began to disappear?

In my SciFi-Magic RPG campaign, the main characters are on Mars, which has been converted to a prison planet. A large device, drilled into the north and south poles, reaching into the core, heating ...
5
votes
10answers
2k views

Are railguns in space intended to be something that causes massive kinetic damage upon collision? Why wouldn't a railgun shot go right through?

Using the search engine here and on Google is not leading me to any answers. Assume no shields here or any unobtanium technologies. What happens upon impact of a projectile fired out of a railgun ...
0
votes
0answers
42 views

Does twice the planet radius mean two bands of desert per hemisphere?

Earth has three convection cells per hemisphere, resulting in each hemisphere having a band of desert at the end of the Hadley cells. Given a planet with the following characteristics: Twice the ...
1
vote
2answers
83 views

If visible light from the sun stopped hitting the earth but the sun still existed, how would this affect the earth?

The sun produces light, heat, and other things. If the visible spectrum of light from the sun stopped hitting the earth but only the light directly from the sun, so moonlight and if heat can be ...
27
votes
13answers
5k views

How can invading aliens access the Internet to find out all about us?

Aliens are camping on Mars and gathering their forces ready for an invasion of Earth. They wish to find out as much as they can about us before commencing hostilities. Question How can they access the ...
7
votes
8answers
1k views

Realistic way of damaging a plane to lead to a survivable crash [closed]

I'd like to approach this in a sort of hard sci-fi way, where the following is grounded in something plausible. Suppose we want to take a plane down at a reasonable speed where there is a 30% chance ...
3
votes
1answer
147 views

Will owls become extinct without airglow?

Given a planet in most ways very similar to Earth (gravity, daylight, atmosphere etc.) with a full transplanted biosphere (all the familiar plants and animals), where the main difference is that as a ...

1
2 3 4 5
148