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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. Avoid using this tag as the only tag on a question.

3
votes
2answers
474 views

Vacuum Rated Sharpie Or Dry Erase Marker/Board?

Would it be possible to make a sharpie or a dry-erase marker that would work in a vacuum? Would they already work? To that end could you make a dry erase board or some such?
2
votes
1answer
67 views

How do I explain the compound eyes of my creatures?

Previous to this question, I made a post regarding many questions about the biology of the creature I had been designing. Looking back on it, I realized that I asked a LOT of questions for just one ...
9
votes
8answers
4k views

Arrow proof medieval glass

In my world, I have ''classic'' knights but with helmets that have transparent visors which are strong enough to protect from arrows. So which material available in medieval times could withstand an ...
2
votes
9answers
190 views

How to explain the presence of a dense debris field around Earth?

I'm creating a sci-fi world similar to ours roughly 50 years in the future. Unobtanium, a futuristic metal and fuel source, was discovered in 2020. Its broad utility led to rapid advances across all ...
0
votes
1answer
54 views

Temperature on a bulls-eye planet planet orbiting a red dwarf star [on hold]

I recently attended a talk on current research into exoplanets and it got me thinking. I want to create a setting on a tidally locked eyeball planet for a futuristic sci-fi story. What I want to ...
6
votes
2answers
250 views

Dragon flight muscles

So, Mark Witton had a lengthy article on why paleontologists think the Quetzalcoatlus northropi could fly. One interesting thing about it is that Witton and Habib think the Quetzalcoatlus had a 90-...
24
votes
13answers
4k views

Real DNA encryption (or at least making it hard to decode/change)

So I'm the owner of a startup which is going to make our lives easier with custom-DNA creatures! Our few first products are selling very well and nothing was wrong until last week's events. Another ...
-1
votes
0answers
60 views

Bacteria microbiota and alteration to human biology [on hold]

So I am sure you know, microscopic life is all around, there's some in us even now, doing things to aid our body, there's more of them than there are human cells. However, I am not as informed as I ...
2
votes
2answers
115 views

Is there a name for being able to switch between bipedal and quadrupedal? [on hold]

I've got a species that can switch between orthograde/bipedal and pronograde/quadrupedal, much like the werewolves in Skyrim, but I don't know what to call that. Does it have a name?
4
votes
9answers
441 views

Is it possible for a river to flow in a spiral pattern?

The question This question has a few parts: 1. Is it possible for a river to naturally form in the shape of a spiral? 2. If not, would an artificially-formed river, in the shape of a spiral, ...
1
vote
4answers
190 views

What kind of fuel would spaceships capable of faster-than-light travel use? [closed]

In my book series, faster-than-light travel is a thing, allowing the fastest spaceships to cross a Milky-Way-sized galaxy in a matter of days. The slower ships could manage that in about 2 weeks. ...
3
votes
8answers
243 views

Calendar dates on different planets

I have about five main planets in my fictional universe and like any planet, their days, months, and years are all different. Are there any problems that could mess the narrative up, since my ...
16
votes
2answers
2k views

Argon Environment Spelunking

Monster Slayer Stan, we are in dire need of your help! The caves in our nearby mountain are filling up with a dense but non-toxic gas that is protecting a monster's nest. The monsters are weak but are ...
8
votes
2answers
178 views

How much medical information could we gather from a wrist-worn device?

Context I have been thinking about the Pip Boy device from the Fallout series of videogames. It is a portable, wearable computer that can gather a lot of data about the user. It looks like this: And ...
3
votes
2answers
156 views

Could the World's Rainshadows Have Spiny Forests?

There is no other way around it--Madagascar is an evolutionary uniquety. 80% of the island's species live nowhere else on Earth. Among this uniqueness is a habitat that seems to come out of science ...
13
votes
5answers
475 views

Could people survive on earth if a day lasted 100 years?

Imagine we took earth and slowed it down so that a day lasted 100 years, could humans (or any life) survive? Let's assume that there are no ill effects of slowing it down, no massive tidal waves, no ...
60
votes
10answers
14k views

If reality were frame-rate based, how could we detect it?

Inspired by this question regarding reality as simulation and this question about a continuous time line, it made me wonder: if our time were indeed like a high frame-rate simulation, how could we ...
31
votes
1answer
4k views

How would the water flow if you were to have a shower in centrifugal force equivalent to 1 g on a rotating space station?

Someone showering after exercise aboard a rotating space station spinning to simulate 1 gravity. How might Coriolis affect jets of water falling within a cubicle of 2 metres in height?
5
votes
2answers
252 views

How much mass does an object in low earth orbit need to create visible gravitational effects on the surface?

The question stems from watching a scene from ID2 and seeing the massive alien mothership landing/crashing on the North Atlantic. What mass would a starship, or any other artificial object ...
1
vote
3answers
286 views

How much power could we harness from waterwheels in the bloodstream?

If we could embed tiny "water" wheels into our veins and arteries, what is the maximum amount of power we could achieve? Assume that they will work and won't malfunction or clog our blood. Also, we ...
-2
votes
1answer
95 views

How much pneumatization is possible? [closed]

So, one of the most common theories about how dragons could maybe still fly, the living gasbag theory. Basically, most of the dragon is a cavity filled with lifting gas or air, in order to reduce its ...
9
votes
1answer
110 views

A reciprocal metabolism is needed on a world overrun by crazy plants

In this paper by Bains et al, an alternative to oxygenic photosynthesis is discussed. Apparently, 4 times the amount of biomass can be produced using hydrogenic over oxygenic photosynthesis. Oxygenic ...
11
votes
2answers
694 views

“Magic” diamonds for fuel?

The subterranean nation of Glot has developed the ability to “thermally link” two equally sized diamonds, such that they are always the same temperature, regardless of spatial separation. We can ...
6
votes
1answer
69 views

How could my humanoids metabolize smoke?

I have a species of humanoids that spends a lot of time around fire. They are able to spark their own fires, and they have a reasonable fire resistance. One problem presenting itself is smoke ...
9
votes
2answers
509 views

How to feed parity transformed John Doe?

We do not know how exactly it happened, but poor John Doe made a space-time trip along a three dimensional analog of a Möbius strip (a Klein bottle). He is now back on Earth, but he is now the mirror ...
6
votes
4answers
204 views

Aside from low gravity, what conditions favor dramatic terrain?

Fantasy and sci-fi works often are set in worlds of dramatic terrain, because, well... it's dramatic. A few examples of the kind of thing I'm talking about: I understand that Earth has some ...
14
votes
12answers
3k views

The weird case of the unresponsive Earth - why does the Earth stop communicating with Mars?

Mars has been colonized, close to a million people are now living above (and below) the martian soil, every few months a ship from Earth arrives with more resource for expansion and more settlers, ...
1
vote
1answer
79 views

Macroevolution in a room

Imagine a large room, perhaps 50 metres in length and 35 in width, with its ceiling 40 metres above the floor. On this ceiling, there are LED lights, rendering the brightness of the room to look ...
3
votes
3answers
136 views

How could dragons run?

You already know the drill: Dragons stand 195 centimeters at the withers, normally 2,95 meters at the top of the head when standing still They can't fly They weigh: 1179 kilograms You're not allowed ...
8
votes
4answers
774 views

Victorian astronomer detecting artificial satellites

To make it short, time-space shenanigans transported everything in a 60 kilometers circumference around an old space-based particle collider to the year 1855. The particle collider was in ...
1
vote
1answer
50 views

Food crops for a planet with short year

Kjør bestillingen 92 umiddelbart. Frøhvelvet skal åpnes, skyttelbussen skal tilberedes. (Execute Order 92 immediately; the seed vault is to be opened, the shuttle prepared)    &...
2
votes
3answers
55 views

Weather and climate of tidally locked, inhabited moon with oceans

This follows another question that brought me some curiousity about the general state of an earth-like moon tidally locked to a gas giant planet. There's been questions about a world tidally locked ...
6
votes
4answers
128 views

Effect of nuclear fallout on glacial ice

I'm working on building a post nuclear war society in a nuclear winter where northern countries have risen to dominance through a combination of being non-primary targets in the nuclear war and having ...
2
votes
2answers
121 views

Are kaiju more probable if they aren't carbon-based lifeforms?

I don't know the science involved, so I'm hoping someone else does. But is it more probable a giant creature of that size and capability would be more likely to exist if it were, say, a silicon-based ...
1
vote
3answers
159 views

How many lashes can be received and leave scars without killing the person? [closed]

I am planning to have one of my female characters flogged by an angry/out of control male. I know that the stats will differ depending on the conditions, so I will provide those below: Her Physical ...
1
vote
3answers
91 views

Whale-Tail and Seal-Legs in One Animal

In marine mammals, there are two different body types for two different niches: A long, strong tail for all-marine whales... ...and all four legs modified into flippers for pinnipeds that feed in ...
4
votes
6answers
964 views

Practical height of towers without elevators

I'm writing about a setting where building technology is quite advanced, but elevators have not yet been invented, so the limiting factor on height is ergonomic. What would be the maximum practical ...
1
vote
1answer
133 views

if someone was stabbed in the heart is there a chance to be saved? [closed]

This question is related to my new Story somewhere in the plot a man is going to be stabbed directly into the chest in a fight , I would like to know how could he survive if the injury penetrate the ...
4
votes
2answers
69 views

What are some plausible formation explanations of a non-hot “Fluffy” Gas Giant planet?

So, in my research and preparation for the question I asked immediately before this one, I was introduced to the concept of "fluffy" gas giants, gas giants with significantly lower density than would ...
2
votes
1answer
252 views

Feasible star + planet + moon combo? Did I miss anything that makes this system wildly unstable or otherwise impossible?

Here's what I've come up with: The star: A main sequence star, roughly a sol analogue Younger than Sol (say 3-3.5 billion years old) roughly the same starting mass as Sol, but has had less time to ...
6
votes
3answers
168 views

How to transmit energy through rock and store it in crystals?

I have created a species that is basically a sort of land coral covered in a thick carapace made of rock. They live on an Earth-like planet (Class M as they say in Star Trek) and behave like coral ...
44
votes
16answers
13k views

Build an impregnable fortress in the middle ages with modern technology

Let's say we want to build the strongest possible fortress¹ in a medieval (1300 CE) setting while having access to any modern technology and material. Said technology can only be used during the ...
6
votes
4answers
228 views

The Hadean Explosion?

In recent years, the search for the origins of life is becoming complex. It turns out that oxygen is NOT a requirement for multicellular life to thrive. As stated in this BBC article, poriferans (...
3
votes
5answers
201 views

Powerful race breeding a better human

So some magical human-like creatures called Altum come from another continent (in my book) to this human populated continent (both are about the size of Europe). They want to help humans become a ...
12
votes
14answers
8k views

Why would post-apocalyptic men be twice as large as women?

I'm creating a post-apocalyptic world several centuries into the future. After the nuclear war whatever is left of humanity has regressed into the dark age. Society: The offspring of those few who ...
5
votes
3answers
195 views

Sea pumps to create rain using windmills to control weather?

I'd love some science advice and facts for this question: If they use wind power to bring up water from the ocean in the day time and spray it on prevailing winds going into land (i.e. 10-15 km from ...
25
votes
4answers
6k views

Oil-eating animal; possible?

I saw a movie where oil companies stumbled upon these fictional underground aquatic deep-sea animals that survived on eating and digesting the oil where they lived. They had squid/octopus-like bodies ...
-1
votes
1answer
139 views

The Underdown, part 1: Size issues [closed]

So, If I'm trying to make a borderline-isekai (trapped in an MMORPG world anime) setting, I might as well just make the game mechanics more real, like invisible walls, everywhere. The world of ...
6
votes
1answer
187 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 ...
4
votes
0answers
103 views

How can I change life on a planet and the presence of Nitrogen in the nitrogen cycle and what effects are there

Nitrogen makes up most of our atmosphere, it gets fixed by bacteria, legumes, etc., and enters the soil in a different form to be used by plant life. The nitrogen gets buried in sedimentary rock over ...