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Questions tagged [sunlight]

Questions involving radiant energy from the Sun.

2
votes
0answers
119 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 ...
5
votes
1answer
292 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 ...
19
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
54 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
271 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
153 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
378 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
79 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
2answers
148 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
610 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
282 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 ...
7
votes
1answer
411 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
255 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
140 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 ...
3
votes
2answers
63 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
632 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
128 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
123 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
298 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
489 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
275 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
142 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 ...
2
votes
1answer
236 views

What would day and night look like in a circumbinary system?

I've been thinking of using a binary model (a planet that rotates around two suns) for a possible story. The specific model is a S-type planetary system, where the planet orbits the the primary star ...
0
votes
2answers
174 views

Humans surviving on surface without Sun

Is it possible for humans to survive on the surface of the Earth, assuming the Sun was, for some reason, not emitting any light/heat/other radiation? Would whether the Sun was actually present affect ...
9
votes
4answers
1k views

Tree growth rings without seasons

Tree growth rings are created because the time of day with sunlight differs throughout the year. How would the inside of a tree look, if it were to grow up on a planet without seasons, where day and ...
14
votes
3answers
1k views

Inducing a Solar Flare

Is there a way to induce a solar flare / coronal mass ejection (CME)? For instance, could a very tight glob of charged particles reconfigure the the Sun's corona leading to this type of event? Is ...
9
votes
2answers
554 views

How would sunlight work in the area of shared atmosphere of a Rocheworld?

(See diagram) Presupposing that a Rocheworld can even exist... I imagine that sunlight would work more or less the same in the atmosphere of any part of an Earth like planet that was tidally locked ...
1
vote
3answers
176 views

Tree bark on tidally locked planets

I saw this video, and I'm curious what color bark would be if the sun was in one position constantly. The video explains that birch trees are white because of stuff in their bark. The reason is ...
5
votes
3answers
146 views

Perceiving color like a native

Assumptions One habitable world in each system (blue sun system and yellow sun system). The two worlds are fundamentally Earth-like. The native humanoid species on each world are genetically ...
0
votes
2answers
113 views

What theory should I apply to the shift of sunlight? [closed]

The world consists of two separate lands, one ruled by Caniform tribes the other Feliform, divided by a sky scraping mountain range. The setting is a mix of ancient Egypt, Iron Age and prehistoric ...
14
votes
4answers
775 views

If only the sun's light went out, how long would it take for all living things to die out?

If by some form of magic, the sun went out, but the earth was still warm a.k.a the Earth did not just freeze and kill us all, who would die first, and how long would it take for all terrestrial living ...
7
votes
4answers
345 views

Spotlight distribution in a hollow earth?

I've been toying with a concept for a hollow/inner Earth universe in which I would like to achieve an even distribution of light. The pickle is that the "sun" of this world operates like a beacon/...
9
votes
4answers
236 views

What should the approximate climate of a world with almost no sunlight be?

We are developing a game setting and, while discussing certain aspects of the it, have stumbled upon our inability to adequately account for some phenomena due to our lack of knowledge. The thing is, ...
8
votes
4answers
1k views

Program for simulating planets

I am currently constructing a fantasy world, where the sun and moon revolve around the planet, which itself is stationary. Because of this, it is quite difficult to imagine how the climate zones would ...
-2
votes
1answer
247 views

The 372-Day Calendar

There seems to be a connection between orbital revolution (one year) and distance from the star the body orbits. For example, Earth orbits the sun at a distance of 93 million miles and completes one ...
-2
votes
4answers
197 views

How much energy would be required to eliminate a shadow from an airship? [closed]

Building on my previous question would an actively camouflaging airship cast a shadow, how much energy would it take to have the airship's shadow disappear? Some metrics you might want to know: The ...
6
votes
1answer
102 views

Defining the perceived appearance of a moon from a planetary surface

I have a homebrew setting with a moon that has some specific features orbiting an Earth sized planet, and I'm trying to find out how these features would affect how the moon looks from the surface of ...
4
votes
6answers
468 views

Device close to sun to focus energy to satellite in Earth Orbit for energy generation

The light from the sun is dissipated in a sphere, so there is a squared relationship between the distance from the sun. Would it be possible to place either a lens or solar collectors with a laser to ...
4
votes
3answers
380 views

Warming up Mars

The vast majority of the sun's energy is wasted -- the light and warmth are sent out in a spherical shape, and the planets only pick up those little bits of energy that happen to be going in the right ...
8
votes
2answers
154 views

What can temporarily disrupt Earth's magnetosphere?

I'm trying to find some type of space weather or other natural occurrences that would result in the intensity of Earth's magnetic field dropping for a few hours to maybe a week or two at most. ...
16
votes
5answers
5k views

If Earth was tidally locked to the sun, where on the surface would the climate be mildest or most hospitable?

This is specifically about the climate, and where on the planet it would be mildest. Imagine Earth, rotating at the usual distance from the sun. Except, it is tidally locked to the sun; a so-called "...
33
votes
5answers
7k views

Dyson sphere with mirrors

What would happen if the entire inner surface of a Dyson sphere (not necessarily a solid shell, maybe a very dense swarm) would be coated into a highly reflective material? Let's say it can reflect ...
0
votes
2answers
191 views

Calculating the solar spectrum received by a planet

How do I calculate the spectrum of light experienced on the surface of an alien planet? I need it to decide what color the local photosynthetic life will predominantly be.
4
votes
1answer
223 views

How extreme can I make an altered solar cycle without destroying an inhabited world?

This is a follow-up to an earlier question. My intent here is to work out the details, and explore the potential consequences, of one of the many excellent answers I received. Relevant questions have ...
22
votes
11answers
3k views

Is it possible to have a sun with visible phases or cycles?

Is there a scientifically plausible way for a habitable world to have a sun that undergoes a regular, dramatic, and easily observable change? One comparable in visual impact to an event like a solar ...
20
votes
11answers
3k views

Can you replace a sun with a burning moon?

In our solar system light and heat are, of course, provided by the sun. I was wondering if a comparable effect might be had by positing a burning moon instead? So rather than a true star, you'd have a ...