Questions tagged [hard-science]

Requires answers backed up by equations, empirical evidence, scientific papers, other citations, etc. Contrast with: science-based and reality-check tags. This tag should never be the only tag on a question because this tag frames how a question should be answered, not the topic. Review the tag info before using this tag, and flag your question for moderator attention once posted to have the hard-science notice added.

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6
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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 ...
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 ...
5
votes
2answers
258 views

What is the largest achievable oxygen-atmosphere world?

I am trying to calculate the largest world that will meet the following criteria: Exists within the Goldilocks zone of a G2V star similar to our sun. Is survivable long-term by anatomically modern ...
6
votes
2answers
440 views

How big an asteroid to hold a ship in stable orbit?

A derelict space craft, 1MKg in mass is in a 100km (more or less) orbit above the surface of an asteroid out in the asteroid belt. How big should the asteroid be to have the ship maintain this orbit ...
8
votes
3answers
370 views

Preventing black hole formation in a water-filled universe

Imagine a universe full of water. A comfortable 22 degrees Celsius warm, density of about 998 grams per liter, and it fills up everything for as far as can be observed. There's nothing else; neither ...
0
votes
1answer
95 views

Implanted device in human body that can transmit over long distance

Previously linked question (which is closed but already has answers). Say we have a type of implanted device in human body (say, ear) used to communicate over a distance. I am thinking about a ...
4
votes
2answers
215 views

Collect powers from human body via miniature implantation

How much energy can we draw from miniature implanted device that collects energy from human body? The goal is to design a type of implanted device in human body used to communicate over a distance, ...
-2
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1answer
123 views

My alloy plausibility

My armour is able to take temperatures upto 500°c and tensile strength of 17 MPa . It is made with some knowledge of physics and material science. My suit is made of mono-crystalline iron and coated ...
2
votes
3answers
286 views

How might other civilizations discover irrational numbers

The first number shown to be irrational in our world was supposedly the square root of 2. I know that the irrationality of π is likely out of reach for a civilization that hasn’t discovered ...
19
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5answers
3k views

Making stillsuits less fantasy - how to dump the heat?

As we all know1, stillsuit as described in the books would cook the user. Water would carry heat away from the body, but then it would be caught again, and again with the heat. Assuming energy is not ...
5
votes
1answer
115 views

Equipotential liquid surfaces in a universe which uses the infinity norm as a metric

Premise On viewing this question, I wondered what the small-scale behavior of drops of liquid in that world would be. What would happen to small volumes of liquids in an atmosphere? Calculations For ...
2
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4answers
291 views

Could a space-based telescope 'sense' something extraneous?

If a fist-sized artefact was to attach itself to a space telescope (of near-term build, such as the Nancy Grace Roman) situated in L2 of a Lagrange point, would Ground Control be able to detect it?
2
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1answer
212 views

Remote listening device inside human ear and powered by the body

Some related (but not the same) questions: Listening (eavesdropping) device that can be put into victim's ear? (which is closed because of the need to focus) Microphone implanted in and powered by ...
1
vote
1answer
109 views

Hyper dense muscles

My organism has hyperdense muscles. This allows their type to generate enormous aerial force, some even able to cut things with their wings or generate G-force winds. What materials is their wings ...
0
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1answer
59 views

Macroscopic Matter Waves [closed]

I know that mass and and wavelenght are inversely proportional, but would it be possible for a macroscopic being to experience them like it if were a particle? and how?
4
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6answers
322 views

Walking to space

Is it possible to have any kind of natural celestial body where at some point on it it's capable of supporting human life without technological assistance (breathable air, survivable temperature with ...
2
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3answers
200 views

Harvesting energy from rain as efficiently as possible

The goal is to engineer the most efficient way(s) to harvest energy from rainfall using moderately advanced technology. My idea was to use this as widespread power source for a race of people that ...
2
votes
4answers
83 views

How to neutralize that noxious monster blood

Listen closely my apprentice, as this may well save your life! Or your customers, rather. And line your pockets to boot. We follow the story of a daring young adventurer, on a quest to defeat the ...
4
votes
3answers
150 views

What kind of propulsion system would work in the air and underwater?

I have a futuristic aircraft that's supposed to be submerged under the sea and to lift off again without an issue. The problem is, I don't know of a propulsion system that could work both under water ...
-1
votes
2answers
98 views

Why would a planet orbiting a black hole have a year lasting just over one month?

This question is based on this description of the Cormoran Supermassive Black Hole in the Orion Arm's website: Orbiting the black hole in hundreds of concentric circles are more than a million ...
5
votes
3answers
305 views

Hard Sci-Fi Werewolf

How possible is the following scenario for a hard sci-fi werewolf? Specifications: Evolved, not infected. Natural-born this way. If an animal can serve up the required capabilities, please mention ...
1
vote
0answers
34 views

What is the highest g planet that can be escaped with current rocketry technology? [duplicate]

A spacefaring race in my story evolved on a high g planet. This made them smaller, stockier and stronger than most other spacefarers. The question is just how high their planet’s gravity could be ...
8
votes
8answers
2k views

Interstellar laser sculpting

Some artistic and civic-minded aliens want to put a bust of their glorious leader, Rigel Rigelius R, in every solar system in the galaxy. Interstellar spaceships are very expensive, and slow besides, ...
7
votes
3answers
827 views

Are bacteria patties possible?

This has got to be the strangest question I've ever asked. I was looking at lab grown meat and thought - I've never grown these cells in a lab - but I sure have grown bacteria! Currently though, this ...
3
votes
3answers
384 views

How hard is it to find ship-sized object via satellite?

I came up with a world that is similar to ours but is recovering from oil reserves depletion. In other words, there is very little to no petrol remaining, so the ones who can use it are mostly ...
3
votes
1answer
143 views

How long could a human survive in a near-pure CO2 atmosphere?

Imagine Mars's atmosphere has been mostly terraformed. By that, I mean that the surface pressure and temperature have been brought up to at least survivable values. (The atmosphere is still 95% Carbon ...
1
vote
3answers
158 views

How dense must a light object be in order to significantly bend space-time?

We know that the mass of the sun bends the space time geometry. Collapsed onto an orange-sized sphere it can turn into a black hole. The physicist Tippler has shown that time travel is theoretically ...
11
votes
1answer
173 views

Maximum mass of a wall clinging gecko?

Very straightforward question, how big can a gecko get before the van der Waal force becomes insufficient to carry their body? In life, each of a gecko's four feet has a clinging strength of up to 20 ...
4
votes
1answer
160 views

Whale-sized electric eel shock?

How does an electric eels shock change if it were the size of a whale? The problem I'm trying to elucidate is how a larger voltage from a much larger creature would change the range, power and ...
1
vote
1answer
75 views

Calculating the Atmospheric Properties of an Exoplanet

I am developing a double-star system filled with several planets, a few of which will be habitable. I also have a spreadsheet file full of all the planets information, from Semi-Major Axis, orbital ...
5
votes
3answers
470 views

What effects would discharge of high-voltage supercapacitor through one's hand cause?

I'm trying to figure out what effects would this have on hand. Let's assume that we touch contacts of said capacitor with thumb and index finger of the same (dry and pretty clean) hand (but I'm also ...
2
votes
3answers
293 views

How far away could a tech similar to RFID be scanned?

Let's say a three letter agency wants to track everyone using an ID card tied to a database. It's simple enough to put an RFID chip in it that gets read at some point of contact, but let's say we want ...
2
votes
0answers
54 views

How different, geographically, would Western North America look if the ice ages lasted 14 million years rather than two-and-a-half?

If such iconic landscapes as the Great Lakes, the Mississippi Basin and New York Harbor are proof of anything, it's that the North America we know has been shaped by ice ages coming and going and ...
15
votes
8answers
2k views

Decelerating a relativistic, beam-powered starship at its destination without pre-established power-beaming infrastructure at said destination

Some background As most of us know, accelerating to relativistic speeds requires truly astronomical amounts of energy. I have internalized that a ship carrying enough energy/fuel to accelerate to near-...
2
votes
1answer
151 views

Permanent marker (sharpie) on an eyeball [closed]

I have a misguided character who will try anything to change their eye color. What are the likely outcomes of using a sharpie (permanent marker) for this? Would the color stick at all? If so, how long ...
1
vote
1answer
181 views

How strong would the wind have to be to strip away flesh?

How fast would air have to move for the gas molecules to strip away at a person's body until nothing is left? I would prefer that actual formulas are used and that it takes less than a few seconds for ...
6
votes
3answers
380 views

Can a "stun gun" be reliably lethal?

A character I'm thinking of is about to have a close call. A woman attacks him with a stun gun by surprise, but by chance he is able to catch the weapon. Backup operatives move to assassinate him ...
3
votes
5answers
311 views

Chance of a breathable atmosphere of any given planet in our galaxy

It is a common trope of science fiction that a space ship or shuttle crashes on a nearby planet, and for the human occupants to step outside and comfortably breath the planet's atmosphere. My question ...
2
votes
1answer
283 views

What impact would it have had if BFCs had been adopted instead of CFCs?

In the late 1920s, Thomas Midgley, Jr. improved the process of synthesis and led the effort to use chlorofluorocarbons, CFCs, as refrigerants: to replace ammonia (NH3), chloromethane (CH3Cl), and ...
6
votes
1answer
168 views

Who on Land Will Survive The Inverse Great Dying?

Long ago, I asked a question on what would create an inverse Great Dying. Allow me to clarify on what I meant: 252 million years ago, the worst event in the history of life on Earth occurred. 70% of ...
6
votes
4answers
214 views

how would a semi-permanent colony orbiting Jupiter protect itself from radiation?

It seems like the Jupiter system is especially attractive in terms of natural resources, and while I assume the majority of any extraction labor will be performed by machines, I also figure there will ...
7
votes
4answers
365 views

Synchronized Galactic Timekeeping [duplicate]

I have some ideas for how to synchronize a galactic time system given the constraints of modern physics. However, my understanding of relativity is pretty limited so I was hoping for feedback or ...
8
votes
2answers
247 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 ...
4
votes
2answers
122 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 ...
6
votes
1answer
144 views

How long could a planet or moon survive if it had an Earth mass black hole within it?

How long could a planet or moon survive if it had an Earth mass black hole within it? Hypothetical primordial black hole formed soon after the Big Bang, or low mass black holes formed later by some ...
13
votes
4answers
2k views

How could the blood be improved so that it can carry more oxygen?

I'm writing a story about scientifically plausible superhumans ( a new genetically enhanced human species that is mentally and physically superior to ordinary humans ), and one of their main features ...
10
votes
1answer
608 views

Metallic Hydrogen Propellant

The idea of potentially using Metallic Hydrogen as a replacement for smokeless powder in current day rifles as a propellant has often been thrown around. What these question don't ask is how well it ...
5
votes
2answers
159 views

Could Plasma be used by a monster to detect prey?

I have a monster in mind (based on something I saw in a dream) that is blind and deaf but finds prey by sensing faint electrical currents. It uses naturally generated plasma bursts to enhance ...
6
votes
4answers
369 views

How far could humanity spread through the universe?

Assume we developed a perfect rocket, say a ramjet using a very efficient matter to energy conversion drive, within a few centuries. How far could settlers get with such a technology? The local group? ...
10
votes
2answers
158 views

Heat shields made in space out of rocky source material - cheap way to get cargo to Earth?

Let's say there's an operation one day producing items from asteroid and lunar material in orbit, and they want to ship goods to Earth. They try making cheap heat shields by processing rock and ...

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