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Where can I find data on typical size and temperature of a star given mass and age?

I am building a solar system and need to investigate my options. I need data to answer questions like "if a star was X solar masses and Y million years old, how large and hot would it be?" ...
spraff's user avatar
  • 2,209
1 vote
1 answer
119 views

multiple retinas in one eye

is it possible to have multiple retinas, would there be advantages to this? Or would it just not work at all? I have a diagram (a shitty one) and more explanation if needed
spiderwriter's user avatar
5 votes
3 answers
141 views

How to use a character's creativity and understanding to expand and improve a consistency-based foresight power

In the setting for a story I'm planning, superpowers of a great many varieties can be gained by earning them, as judged by an impartial magical force that is effectively part of the setting's physics. ...
Douglas's user avatar
  • 250
4 votes
1 answer
351 views

How far can inland sea with area 350000 sqkm influence precipitation?

I already wrote here one question about my planet Artemis. It has size similar to Earth, it is orbiting its star in average distance like Earth, but with little bit larger excentricity (causing that ...
GiuseppeZee's user avatar
0 votes
2 answers
60 views

Questions regarding suspiciously unnatural properties of a planet killing, stealth and above-average velocity asteroid

I was gonna ask a very similar question to a very recently updated post from 5 years ago, sorry if considered a duplicate. My question is : how long can a 15-150 km-long extrasolar asteroid coming ...
Kaliem's user avatar
  • 19
2 votes
4 answers
164 views

What if a wizard mass produces gold and silver to crash the market? [closed]

A Wizard that grew up poor and resentful of the jewellery of the rich people around him decides he'll end the allure of gold and silver for good. For this purpose, he immediately produces a billion ...
Thales's user avatar
  • 476
8 votes
8 answers
1k views

What animals would herbivorous humans most likely domesticate?

When humans first domesticated goats, it wasn't for milking them. No, they domesticated them originally because they kept hunting them for meat. That's the primary purpose, the most aggressive and ...
SuperYoshikong's user avatar
3 votes
3 answers
82 views

Do my human migration patterns make sense?

I have created a map of migration patterns since the evolution of homo sapiens on my planet. I am wondering if the movement makes sense and feels realistic, when compared to the climates and terrain ...
www's user avatar
  • 807
2 votes
3 answers
157 views

Would a non-equatorial space elevator be feasible? [duplicate]

For context, my story is quite far in the future(not sure quite how far), and space is quite developed at this point, so elevators are a thing that have been made, although only a few. Essentially, ...
Bubbles's user avatar
  • 42
0 votes
2 answers
85 views

Aftermath of a Limited Nuclear Exchange [closed]

Realistically, what factors might limit a nuclear exchange between NATO and Russia, such that the bulk of humanity could survive and be a spacefaring civilization in, say, 300 years?
ajderxsen's user avatar
-1 votes
0 answers
43 views

What would it look like if space had a boundary

Space in the universe as far as we know either extends infinitely in all directions, or it is finite but one edge of the finite space is connected to the other end. Like the 2d plane on 3D torus ...
Synthia Mayhem 's user avatar
2 votes
1 answer
28 views

Fire-analog on an ammonia planet

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 times larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with ...
Neil Iyer's user avatar
  • 1,264
3 votes
2 answers
663 views

What fauna can survive a permanently dark sky?

A few days ago i asked this question. In it asked about flora that could survive under a permanently dark sky. In this regard this regard this question is quite similar. Though now the question is ...
Fallenspacerock's user avatar
1 vote
1 answer
54 views

What would an army with futuristic technology do to create strong defensive points

An army of about 13 million with futuristic equipment was dropped onto a planet and told to defeat a bunch of corporations who were causing trouble there. They make massive gains initially, but the ...
Gregory's user avatar
  • 27
2 votes
1 answer
42 views

Beryllium photosynthesis for floating plants?

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 times larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with ...
Neil Iyer's user avatar
  • 1,264
2 votes
1 answer
48 views

Would Earlier Knowledge of Rubber Vulcanization have been a Game Changer?

I was working on an alternate history world where the Americas are not heavily colonized and I became aware of how some people in the Yucatan were vulcanizing rubber long before Goodyear. Assuming ...
Coquí's user avatar
  • 117
1 vote
1 answer
40 views

Post-war apocalyptic desertification scenario lasting at least 1000 years

I am writing a story, in which humanity is struggling to survive and rebuild civilisation hundreds of years after a devastating war with AIs. I'd like the world to be covered in deserts, where humans ...
Eillis's user avatar
  • 31
-2 votes
0 answers
25 views

Could fire-breathing lifeforms achieve sapience

Fiery organisms are rare in nature, but looking at their intellect presents a troubling picture for worldbuilders At the lower end we have humans, fairly intelligent organisms with only a basic ...
Ichthys King's user avatar
2 votes
3 answers
65 views

Why would an advanced society settle most major political questions with games?

I want to make a society which settles most major political questions e.g. tax codes, war, foreign policy, etc with competitive games where different factions sponsor gamers to do games and where the ...
Nepene Nep's user avatar
  • 38.6k
2 votes
1 answer
46 views

How would replaceable egg yolk evolve?

Those familiar with Alex Ries' Birrin project probably know that the Birrin as an alien species have unique eggs with a sort of replaceable egg yolk the parent needs to exchange every so often. The ...
LiveInAmbeR's user avatar
  • 10.6k
7 votes
8 answers
3k views

Will nothing bad happen if I just create infinite energy?

My magic system introduces an additional energy form that one can convert at a rate leaving out surplus energy, thus generating more than what was initially utilized. For instance, using Arcana to ...
Xenophile's user avatar
  • 907
2 votes
0 answers
36 views

Luminosity and Radial changes in an Aging star

I’ve been wondering this for a while to make my words more accurate and make future versions, and I was wondering, is there a way to calculate the change of luminosity and radius of a star while it ...
MrUnavailable's user avatar
3 votes
1 answer
47 views

Binary Star System Physics

I am envisioning a planet that has two orbiting stars: a small yellow-white F class and a larger orange K class star. The stars were once closer and created a more tumultous tectonic history but since ...
Zip Zap's user avatar
  • 75
5 votes
4 answers
714 views

How can an evil empire build a fortress that stands for a thousand years?

I'm in the fairly early stages of writing a story. My world is a low-magic (or even no magic- I haven't fully decided yet) fantasy setting, and I'll be adhering pretty hard to the medieval stasis ...
Belgabad's user avatar
  • 159
3 votes
2 answers
99 views

Re-create electricity in a world where modern technlogy has been banned

We're in the future and all modern technology has been banned (consider "modern" = "from industrial revolution onwards"). This happened about 200 years ago. Now, a group of rebels ...
Ilma2811's user avatar
  • 103
2 votes
4 answers
96 views

How would these floating plants not need to constantly adjust their gas bladder?

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 times larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with ...
Neil Iyer's user avatar
  • 1,264
15 votes
2 answers
2k views

Are my skin and hair colors believable?

I'm trying to determine whether my skin and hair colors are consistent with the climate of my planet, if I've done them correctly, within reason.
www's user avatar
  • 807
6 votes
1 answer
107 views

What would be the long-term effects of a gas giant being hit by its moon?

I've been brainstorming ways to make the gas giants in my system more interesting, and as a result of this I thought of having one of them be hit by one of their moons (the reasons why are not ...
Pointy Orb's user avatar
-1 votes
0 answers
41 views

I'm working on some speculative evolution concepts in a roleplay game, however there are some very strict guidelines to what I can do [closed]

So, in this roleplay game, specifically "After the Flash: Wintertide" on roblox, a global nuclear war devastated the world about century from now, wiping out most of earth's population. As ...
Yutii's user avatar
  • 7
4 votes
2 answers
128 views

Could a planet have metalloids but very few metals?

Could advanced technology be created by an intelligent species on a planet where there are very few true metals and only large amounts of metalloids? I envision a planet sparse in accessible metals, ...
Zip Zap's user avatar
  • 75
5 votes
3 answers
133 views

What's a semi-plausible 24 hour planetary sterilization look like?

In my setting, there is a type of airborne fungal spore that can infect all living matter, and a Star Wars Galactic Empire style/sized faction that wants to sterilize planets with this spore ...
ThunderSnug's user avatar
4 votes
4 answers
145 views

Could a Luna-based colony successfully revolt against Earth? [closed]

Let’s say that a colony established by humans on Earth’s moon was, for whatever reason, entering a revolutionary war with Earth for its own long-term sovereignty as a planet/nation. Mars has also been ...
beeb8338's user avatar
2 votes
0 answers
41 views

Could a biological organism power itself with electricity like a smartphone (or something similar)?

Imagine an alien world where there are are shallow lakes where electricity generating beings (like electric eels or whatever) would power many of the land dwelling creatures, including the dominant ...
Mishima's user avatar
  • 999
3 votes
2 answers
136 views

What would a beacon of light activated on Earth's surface look like from space?

Would it be physically possible to have a beacon on the Earth's surface so powerful its beam would continue outwards past the Earth, further into space, and out into the cosmos? What would that beam ...
iolim5678's user avatar
16 votes
10 answers
2k views

How would the existence of sapient "Pet Rocks" affect the economy of a medieval kingdom?

The world: A standard medieval European-ish fantasy world, with very limited magic, which aside from the titular exception has little to no effect on everyday life. The continent is divided into ...
Going Durden's user avatar
  • 2,119
4 votes
1 answer
79 views

How would these floating plants concentrate neon?

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with some ...
Neil Iyer's user avatar
  • 1,264
14 votes
13 answers
3k views

Why would dragons evolve to breathe fire?

Assuming dragons exist today on earth, and are four-legged, with wings, and cold blooded reptiles, what evolutionary purpose would there be in being able to breathe fire? This question is ignoring how ...
bruithel's user avatar
  • 169
7 votes
3 answers
1k views

Could variation of the universal constants affect computation?

One of the obstacles to realistic - yet interesting - space battles is that of effective computation. If all trajectories and whatnot can be computed much faster than a human could follow, it leaves ...
Spitemaster's user avatar
5 votes
2 answers
79 views

How do these "mind-reading" microbes collaboratively compute as fast as neurons?

For some time now I've been trying at a plausible sort of "translation (or some other brain-affecting) microbe" concept. The main idea I'm basing this upon is of biofilms that could ...
inkwell87's user avatar
  • 939
3 votes
1 answer
107 views

Gene-smiths creating super warriors. They need a secondary digestive system with a new super food

Got a faction that's making super warriors. The gene-smiths of my story managed to biologically engineer a far better human body. That's easy. This includes a far more developed digestive system, ...
Seallussus's user avatar
  • 8,325
4 votes
5 answers
741 views

What does an intersection between two universes look like?

In this scenario, two universes intersect. During the intersection, they do not bounce off of each other. Instead, they pass through each other and intersect. What would the intersection look like? ...
Christmas Snow's user avatar
12 votes
14 answers
4k views

Why does a goddess put a low limit on the number of priests?

This is probably the first magic question I’ve asked so sorry if I get anything wrong this time. In this world, there is a goddess, and she is very, very real. She’s functionally omniscient: whenever ...
controlgroup's user avatar
  • 3,238
2 votes
6 answers
1k views

How can you change up medieval feudalism while keeping the concept of 'houses'?

My world is ruled by vampire-like superhumans, who have supernatural abilities like prescience and telepathy. The vampires require human blood to sustain their powers and long life. They lord over and ...
bruithel's user avatar
  • 169
6 votes
6 answers
4k views

No stomach, how do I eat?

Imagine a creature that through congenital diseases and mutations starts slowly losing its digestive system as it becomes less and less efficient and smaller until it is vestigial and eventually ...
Xenophile's user avatar
  • 907
-1 votes
1 answer
92 views

Feasibility of One-Citizen Dictatorship [closed]

Does it make sense for a country to be dictatorial but with extremely limited power? The only citizen of the Autonomous State of the Panama Canal (roughly same borders as Panama Canal Zone) is the ...
MultipleTowns's user avatar
11 votes
9 answers
4k views

Is this super soldier viable and grounded?

Below is a excerpt of a set of notes that I have compiled that is the basis for a science fiction story that I am writing. I have spent a fair amount of time trying to come up with a close/hard/sci-...
TheWookieeBreath's user avatar
7 votes
3 answers
771 views

Feasibility of a bio-engineered, floating tree lifeform in the Venusian atmosphere?

Would it be possible, given many advances in genetic engineering that today remain speculative, to design a lifeform capable of withstanding the hostile conditions of the Venusian atmosphere? I'm ...
Aeolian's user avatar
  • 71
5 votes
0 answers
115 views

Blood on this ammonia planet

I am currently building a planet that weighs about 4 earth masses and is 2.3 earth radii long. It is an ammonia planet (as the title suggests), and has ammonia oceans with some dissolved water ice, ...
Neil Iyer's user avatar
  • 1,264
1 vote
2 answers
169 views

I have a world with two moons, and I was wondering how often they would both be full at the same time

As I said in the title, I have a world with two moons. One has an orbital period of 17 days Earth days (Moon 1) while the other has an orbital period of 57 Earth days (Moon 2) and the planet they are ...
Jack Kibatsume's user avatar
6 votes
3 answers
705 views

Frozen World Atmosphere?

There's a planet in my world's solar system that used to be habitable but was knocked off course. its been frozen for about 4 billion years in the present time. I'm wondering if the atmosphere would ...
Raka Holiday's user avatar

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