Questions tagged [sunlight]

Questions involving radiant energy from the Sun.

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18
votes
17answers
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- ...
2
votes
2answers
101 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 ...
4
votes
2answers
247 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 ...
1
vote
3answers
167 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. ...
2
votes
2answers
119 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, ...
5
votes
1answer
143 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 ...
1
vote
2answers
103 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 ...
3
votes
3answers
192 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 ...
2
votes
1answer
259 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, ...
9
votes
5answers
815 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....
4
votes
1answer
197 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 ...
2
votes
3answers
205 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 ...
2
votes
1answer
158 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 ...
4
votes
4answers
184 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 ...
7
votes
3answers
906 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? ...
4
votes
1answer
154 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 ...
4
votes
6answers
388 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 / ...
3
votes
2answers
101 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)? ...
6
votes
1answer
162 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 ...
1
vote
1answer
80 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: \...
2
votes
1answer
133 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 ...
30
votes
9answers
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 ...
11
votes
2answers
975 views

How close to the Sun would you have to be to hear it?

Taken from this fascinating answer: The Sun is immensely loud. The surface generates thousands to tens of thousands of watts of sound power for every square meter. That's something like 10x to ...
2
votes
0answers
159 views

I'm inventing a new calendar. What are good criteria for the choices of first day, first year, and first hour? [closed]

I'm inventing a new calendar: It will be used worldwide. It uses an intercalary (366th) day to be inserted every 4 years. If extremely successful (unlikely I know), it will replace the Gregorian ...
7
votes
2answers
531 views

How would our skies look if our sun was a white dwarf instead?

What I'm using your information for: My planet is small, has a thicker atmosphere than earth and it's orbiting a white dwarf. The main reason I chose it to be a white dwarf is that I read somewhere ...
41
votes
10answers
7k views

Would life always name the light from their sun “white” [closed]

I've heard it said that white light contains all the colors in it. Our sun produces white light and that the visible spectrum is just the range we evolved to see because our atmosphere is transparent ...
20
votes
11answers
7k views

How to not get blinded by an attack at dawn

I'm imagining a low-tech medieval fantasy world where an attack at dawn such that the defenders are forced to look into the rising sun conveys a huge advantage. The effect on my fantasy humanoids ...
-1
votes
2answers
59 views

Focusing solar irradiation to create equatorial conditions at the poles [closed]

As I understand it, the majority of thermal energy on Earth comes as a by-product of absorbing radiant solar energy. Since the equator gets hit by rays which are almost perpendicular to the surface of ...
4
votes
2answers
278 views

How to explain day is 10 times as bright but no warmer?

Set at the present day Earth, the daylight on average is ten times as bright as today, approximately 111,000 lux at noon for example and subject to geographic and the air quality etc. I am looking for ...
6
votes
4answers
204 views

How far away from a Sol-class sun could a planet be and still be habitable?

In my galaxy, I need a planet that is far enough away from its star to be relatively cold compared to Earth, but not so cold that liquid water cold not exist. The planet has 2 continents, 1 northern ...
2
votes
4answers
518 views

Solar Flare disabling Nuclear Weapon defenses?

I have a nuclear post-apocalypse that isn't 100% depressing. It's only 95% so. /s I was contemplating an origin story of a solar flare doing some rather nasty things to circuitry related to nuclear ...
1
vote
3answers
109 views

Types of life on a planet in a sun-synchronous orbit?

Basically, a sun-synchronous orbit is where one side of an object is always facing a star as it revolves around it (much like our Moon is, which is where the phrase 'dark side of the moon' originates')...
2
votes
3answers
302 views

What would a meteorite have to be made of so that the sun is obscured for millennia?

I want to make my meteorite hit the Earth, after which the impact debris and ash blocks the sun just enough to make agriculture no longer feasible.
2
votes
2answers
187 views

How do I figure out temperatures and amount of sunlight for a world?

How do I figure out the temperatures of certain latitudes on a planet with factors such as sunlight and the emission of heat and energy from a planet's interior? Assume the planet is smaller than ...
11
votes
2answers
746 views

Life in permanent shadow

I've been experimenting with a fantasy world that is flat, with the sun fixed in place over the centre. The day-night cycle is provided by the sun dimming and then brightening again. Most of the rest ...
-3
votes
1answer
302 views

In a world with 12 moons but NO sun, how to define a day? [closed]

I made the map of my fantasy world before thinking about the physics, as you can see bellow the art! I'm interested to understand how to decide which moon is in the sky at a given moment, if it's ...
16
votes
4answers
3k views

Hollow Earth - how to measure it?

I'm making a map for my friend - I drew a pretty neat cartographic grid with a proper map projection - and then he reminded me that his world is actually an inverted Earth with a glowing ball of ...
8
votes
1answer
2k views

Can fiber optic cables be used to pipe sunlight into an underground bunker for growing plants?

One major problem with living underground is you lose all of that wonderful energy provided by the sun. This energy is useful for many things including growing plants for food. A window is effectively ...
4
votes
2answers
401 views

Could a person safely walk around with exposed skin under the sunlight of a red dwarf when it's not flaring?

I've been thinking about a fantasy setting built around the idea of a habitable, tidally-locked world orbiting a red dwarf. Since it is fantasy I do have some leeway in terms of the real world ...
2
votes
2answers
149 views

Earth Orbit Extreme Change

So recently I got slated for missing some glaring obvious flaws in my story on here, which I really do appreciate. I'm approaching the question from a different angle though, in two parts. What ...
4
votes
3answers
97 views

Opaque Solar Shield in Geosynchronous Orbit: Plausibility + Challenges of Maintaining Orbit

Suppose humans of the late 21st century or beyond began constructing a solar shield as a solution to climate change. Suppose for some reason (open to suggestions) they choose to build the shield in ...
12
votes
6answers
682 views

How can a remote planet with little to no sunlight have high wind speeds?

I saw this question here: Can I have wind turbines on my base? and someone else asked about how the planet can have 60-100mph winds without very much sunlight to cause the energy differential, to ...
3
votes
2answers
485 views

Effect of sunset-like sky colors on human psychology

The scenario is as follows: a habitable planet is being colonized. The conditions are fine, in spite of differences in the parent star. The star is smaller than our sun, either an orange K-star or a ...
2
votes
1answer
159 views

How do I calculate the amount of sunlight a planet gets?

I'm working on a planet and I want to know what is the maximum amount of sunlight my planet gets in lux (for Earth It's 120000 lux). My planet orbits an M4V class red dwarf that has a mass of 0.22 M☉...
14
votes
1answer
348 views

Radiation Levels and Effects on Planet with 27 Suns

Other posts from this thread will be posted here: How to make an Earth with 27 suns work (Closed as a duplicate of the follow up, Attempt Two) How To Make an Earth with 27 Suns Work, Attempt Two: ...
6
votes
4answers
664 views

Are there size constraints to Time Bubbles?

I'm creating various artificial Time Bubbles in my universe where time flows faster or slower inside a specified area, typically depicted as a semi-transparent bubble. Before developing any more ...
-5
votes
4answers
301 views

On a planet without gravity, how can water stay on the surface? [closed]

In a fictional world that is round, and has no gravity, how would you go about making the water not fall off the planet (Or even people, for that matter?. Is there some kind of futuristic force field ...
18
votes
6answers
2k views

What would be the effect of magic ultraviolet rocks on developing societies?

One of my favorite bits of set dressing is magic glowing rocks. You see them in movies, video games, and every other manner of medium conveying fantasy settings. Personally, I'm perfectly okay with ...
18
votes
5answers
4k views

Can visible light be blocked while still allowing for light for plants to survive to pass through?

What I'm thinking for this question is that some kind of filter is put around the sun by aliens that prevents some kinds of solar energy from passing through but allows other types. Like if it ...
1
vote
2answers
167 views

How much darker could the sun get without killing off the plants necessary for the production of oxygen?

So essentially in my story, aliens put something around the sun that doesn't stop all the light from it hitting Earth, but only some of it, effectively dimming the light without outright extinguishing ...