Questions tagged [sunlight]

Questions involving radiant energy from the Sun.

Filter by
Sorted by
Tagged with
13 votes
5 answers
1k views

Viability of solar furnace/smelter in pre-industrial society

I am trying to figure out how plausible it would be for people without electricity or steam power technology to use the sun to smelt and forge iron and steel. The people developing this solar furnace ...
user avatar
-1 votes
0 answers
31 views

color of plants from sun wavelenthg [duplicate]

So to my current knowledge a plants color is normaly the oppisite of the light it absorbs like how the plants are green on earth because it does not absorb the green wavelengths of white light.and do ...
user avatar
5 votes
1 answer
62 views

What changes to a humans physical form would occur if society lived inside the Earth?

(Mandatory I am new here, hello, nice to meet some fellow world builders, sorry for any mistakes, yikkity yak and all that) In my "world", it has been 500 years since the majority of human ...
user avatar
4 votes
2 answers
171 views

How large must a solar furnace be in order to sweep a planets surface melting everything in its path?

To melt a planets surface erasing all traces of civilisation, I figured a solar furnace would do the trick. It is more elegant than nuking a planet, not to mention leaves no nuclear fallout. Perfect ...
user avatar
  • 8,617
8 votes
3 answers
491 views

Visibility of a Dyson swarm "creature" from its orbiting planet

An alien species has built Dyson swarms around stars which have orbiting planets with primitive life on them. The section of the star which is facing the planet with life is left uncovered to let the ...
user avatar
4 votes
4 answers
212 views

Can one half of a planet be desolate, while the other half is lush vegetation?

Is it possible for half a planet to be cold, dark and lifeless while the other is a lush jungle? Can a planet be tidally locked to a sun where the jungle surface is always facing the light, and the ...
user avatar
9 votes
5 answers
4k views

How do migratory dragons avoid being blinded by sun?

These dragons are as big as double decker with wing span approaching 20m measuring from tip to tip, they migrate in large numbers and fly at an altitude between 10,000m to 20,000m above sea level. ...
user avatar
  • 45.9k
13 votes
3 answers
370 views

How big does a world have to be to not have a sunset?

Normally we watch the sun descend, it's dimmed a bit by the atmosphere before dropping below the horizon. What I'm interested in is how big it would have to be so the atmospheric dimming is sufficient ...
user avatar
5 votes
5 answers
173 views

How would a crystal moon interact with light from the sun? Would a crystal moon reflect "too much" light for night time?

I have an earth-like planet in a fantasy setting with two moons, one of them made of crystal. It will be a fantasy crystal, properties TBD (probably by some of the answers to this question). My main ...
user avatar
  • 181
1 vote
0 answers
101 views

How would the 'sky' look in a Stanford Torus?

I hope this is focused enough: my question boils down to: "How do people living in a Stanford Torus experience the sky?" Context: Operating on the assumption that we're in a fairly typical ...
user avatar
3 votes
4 answers
737 views

Where does most of a sun's energy go?

first post ever here. I've read the guidelines, but please do let me know if I'm breaking any rule or doing something wrong. So, I am creating a magic system based on the energy of a star. More ...
user avatar
  • 352
6 votes
6 answers
2k views

Can mirrors on the moon allow solar panels to operate at night?

Solar panels cannot operate at night. If we put self-adjusting mirrors on the near side of the moon, they could reflect sunlight back to the dark Earth, allowing solar panels to operate at night. How ...
user avatar
  • 1,286
1 vote
1 answer
83 views

Concerning Earth plants on an alien world, how much "sunlight" would "too much" and "too little" be compared to our sunlight?

In a binary system of artificially immortal stars, each one orbited by a ring of mirrors, a whole line of Earthlike planets orbits the binary within its habitable zone, from 400 to 800 AUs. While ...
user avatar
  • 14.3k
4 votes
2 answers
132 views

How would Blue/Yellow colored plants change during different weather seasons

My planet basically revolves around a blue star or a star that gives off more blue wavelengths, and the color of the plants are either blue or yellow or both because they are trying to absorb the most ...
user avatar
2 votes
4 answers
1k views

Can humanoids be of dark skin despite living somewhat lower than the equator and vice versa?

So if the places on the equator of my world has light skinned people of the deserts while the places a bit south of the equator can have dark skinned folks of tropical rainforests, is that explainable ...
user avatar
  • 121
3 votes
5 answers
1k views

Why does my arcology let light in, when it was originally a sleeper ship

In my story the protagonist lives in an arcology, but this is not just any arcology. Over a 100 years ago, a global war fought between those who sided with a massively distributed and rather 'insane' ...
user avatar
2 votes
2 answers
118 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 ...
user avatar
  • 651
0 votes
1 answer
458 views

What Would the Sky Look Like If the Sun Were a Different Color (And Still Half a Degree Wide)? [duplicate]

This question has been asked many, many, many times--what would the sky look like if the sun were a different color? But the mistake I keep seeing is that they used actual stars and imagined Earth as ...
user avatar
  • 14.3k
5 votes
1 answer
104 views

Creating fog over the ocean and large island using electricity and..?

Short version: This sea dragon can discharge and manipulate electricity. It wants to cover a large area of the ocean's surface in fog, how could it accomplish this? The creature is intelligent and has ...
user avatar
2 votes
1 answer
126 views

Magic system- photosynthesis/"solar cell" dragons using electricity for warmth?

Background: So, I'm creating a magic system for a race of dragons based on the abilities of the Oriental Hornet and the Elysia chlorotica. both of these animals can directly utilize solar energy. I ...
user avatar
3 votes
5 answers
373 views

Earth with no sunlight

What phenomenon could stop or reduce the sunlight on Earth? I am thinking about a prolonged solar eclipse. Is it possible for it to last for years? If not, is there a way for the sun to stop shining ...
user avatar
-3 votes
2 answers
248 views

How Bright Would a "Summer" Night Be on This Extreme Alternate Earth?

Here is the oversimplified map of the solar system of an alternate Earth: It is actually two separate binaries--one consisting of a red giant 100 times as wide, one-third as massive and 1,000 times ...
user avatar
  • 14.3k
3 votes
2 answers
570 views

Would Venusian Sunlight Be Too Much for Earth Plants?

This is Chris Wayans's map of a terraformed Venus: While there have been questions in this Stack Exchange on how to make Venus more livable for us humans, one question stands glaringly absent, and ...
user avatar
  • 14.3k
6 votes
4 answers
693 views

Which Crops Could be Grown in a Subpolar Oceanic (CFC) Climate Zone?

In my fantasy series, the area the main protagonist is from is cool and dreary year-round, but never cold and never hot. For example, it never really gets higher than the 60s farenheit at the peak of ...
user avatar
0 votes
2 answers
130 views

Red Sun Plus Blue Sun Equals Magenta Sky?

Okay, my second cousin is working on a story that takes place on a planet named Odroia. It is an Earthlike planet with a supercontinent similar to Pangea, that has scattered rivers and lakes, with its ...
user avatar
  • 2,210
1 vote
3 answers
148 views

Perpetual Day Planet

I’d like to know if this is plausible: A habitable planet that’s always day. It kinda works like this: The planet orbits its largest sun, which is also orbited by three smaller suns that share the ...
user avatar
  • 2,210
10 votes
2 answers
2k views

What would seasons and daylight be like if the Earth was on an eight-shaped orbit between two stars?

I'm building a medieval-high-fantasy world and I want it to have two suns. I'd like it to make it somewhat realistic at least as far as seasons and light/biomes go, while the actual feasibility of ...
user avatar
  • 4,617
1 vote
0 answers
104 views

How Bright Would the Sky on This Alternate Earth Be? The Sequel to "The 372-Day Calendar"

Long ago, I asked how far Earth would orbit the sun if one year lasts 372 days instead of 365 and how much it'd affect the overall brightness. What I got was that Earth with a 372-day calendar would ...
user avatar
  • 14.3k
18 votes
17 answers
7k views

Earth was suddenly teleported away from the sun. Can we recover?

Through some evil scientist man's evil plot to destroy the world, he transported the entire Earth away from the sun into an unknown point in space where there is no sun. Could we recover? Details- ...
user avatar
2 votes
2 answers
355 views

How would day and night look like on a planet that orbits two suns? [duplicate]

I'm writing a fantasy story set in a p-type circumbinary system and I'd like to know how this would affect day and night, when the suns and moon would be visible, and the climate and seasons on the ...
user avatar
4 votes
2 answers
379 views

What colour is my sky? If my planet has two different suns

In my fictional binary system, my planet has two suns: a white dwarf star and a red giant. I would like to know what colour my sky would be when both suns are in the sky of my planet. I've done some ...
user avatar
1 vote
3 answers
508 views

What kind of power could be stronger than light and shadow? [closed]

I am creating a world where exist 2 main types of magic users: the ones with the ability to control the light of the sun and the ones with the ability to control the darkness of the shadows/moon. ...
user avatar
2 votes
2 answers
177 views

Harnessing energy directly from the sun via quantum tunneling

In the universe of my story, the Earth is ridden with metahumans with uncanny powers that do all sorts of different things. Of course, to do all this, they would require a tremendous amount of energy, ...
user avatar
  • 395
5 votes
1 answer
177 views

An Earth with a permanent winter state with drastically reduced temperature, dark skies and mass extinctions

I had posted a question a couple of days ago asking if it would be possible for an artificial satellite/cosmic body at the L1 orbit to block out the Sun, but the logistics of that is a little too ...
user avatar
  • 1,271
1 vote
2 answers
109 views

What would happen to all life on Earth if the planet started suddenly receiving reduced sunlight? [duplicate]

Let's say that the Sun suddenly almost completely shuts down and the Earth is now able to only receive an amount of sunlight equal to that received by the Moon during a full-moon night. (Assuming ...
user avatar
3 votes
3 answers
607 views

How to explain a planet around a K-Type star with Orange/Red/Purple plants?

Basically, in a sci-fi roleplaying group I am apart of, I have began to work on a long-standing human colony world. The tech-level is pretty much bog-standard sci-fi, and such, colonisation is ...
user avatar
2 votes
1 answer
266 views

What if the Sun were suddenly 2/3 as bright? [closed]

The amount of solar energy received by Earth is reduced to 67% of the current amount, uniformly across the Earth and throughout the EM spectrum. The mass of the sun stays the same. One month later, ...
user avatar
  • 129
9 votes
6 answers
4k views

How would a Dyson Swarm transmit energy to the Earth?

The Dyson Swarm is common in sci fi as an energy source, and sometimes also as a powerful weapon. As it is commonly understood, it harnesses the energy of the sun, which stores a vast amount of energy....
user avatar
  • 2,855
4 votes
1 answer
263 views

What colour would a flat world's sky be?

In continuation of my previous question, I'm wondering about the colour of a flat world's sky. To recap the previous question, I'm imagining a flat world with the sun fixed relatively low above the ...
user avatar
  • 1,099
2 votes
3 answers
370 views

Anatomically correct Kryptonian, part 1

Part of the Anatomically Correct series of questions. Due to the nature of Superman having so many different powers, I wanted to focus specifically on one aspect of his character: the ability to be ...
user avatar
  • 6,112
2 votes
1 answer
315 views

How much sunlight can I get into my O'Neill cylinder and how much light needs to be artificial?

The cylinder is 32 km long in total, 8 km in diameter, with 3km long endcaps, resulting in a habital area with a length of 26 km (= and an area of cirka 754 km2). The main body of the cylinder is ...
user avatar
  • 1,082
4 votes
4 answers
296 views

Would living on around Alpha Centauri change how our eyes see color?

I am writing a sci fi novel in which one of the primary factions is a lost space colony sent to Proxima Centauri (Alpha Centauri C) roughly 350 years prior on a generation ship. The trip took roughly ...
user avatar
7 votes
3 answers
950 views

How tall would a rainforest need to be to make it completely dark at ground level

Most of the sunlight in a rainforest is intercepted by its canopy. Only about 2% of the light reaches the ground. How tall would a rainforest need to be to make it completely dark at ground level? ...
user avatar
  • 171
4 votes
1 answer
202 views

Days and Seasons via Daily Eclipses in a Flat World

While working on the cosmos of a flat world, I came upon the idea of using a dim sum rotating about an axis through the central pole (as described here) in order to accomplish days and seasons. The ...
user avatar
  • 483
4 votes
6 answers
507 views

Can a Sunset Be Black (Infrared)?

Fact 1: The cause of a sunset is from the angle of the sunlight, because the amount of scattering increases as the light passes through more and more of the atmosphere. Fact 2: Higher frequency / ...
user avatar
  • 6,112
3 votes
2 answers
171 views

Simulation or API to get sun light spectrum on earth given the position, time and day of the year

Does anyone know a site, software, public API (or formula) to get the solar light spectrum on earth given the time of the day, day of the year, and earth meassurement position (lattitude, longitude)? ...
user avatar
6 votes
1 answer
226 views

Penumbra colors of a flat earth's sun-shades

So, I have been watching a lot of flat-earth debunking videos on YouTube, which has tickled my world-building bone. So, I'm imagining a world with a sphere of sunlight-level luminosity hanging ...
user avatar
  • 1,099
1 vote
1 answer
82 views

At what time of day does the illuminance coincide with that on my planet at noon?

My planet (I'll call it $P$ for practical reasons) is 2 AU from the Sun, a distance in which it receives 25 % of the sunlight that Earth receives. This can be estimated with the Inverse Square Law: \...
user avatar
  • 883
2 votes
1 answer
181 views

A desert planet with temperate polar regions could sustain how much plant-life? Any?

One proposed type of desert planet is one in which the equator and the "tropics" are harsh, hot deserts, but the polar regions are temperate, habitable, and lush with life. You can see an example of ...
user avatar
  • 1,286
31 votes
9 answers
6k views

Can there be plants on the dark side of a tidally locked world?

In my story, there is an Earth-sized planet orbiting a red dwarf, tidally locked to its parent star, with large oceans like Earth, two moons similar to ours and a thick atmosphere to distribute heat ...
user avatar
  • 311