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Questions tagged [sunlight]

Questions involving radiant energy from the Sun.

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
201 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
185 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
122 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
57 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
557 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
78 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
117 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
236 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
366 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
258 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 ...
17
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
3k 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
122 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
170 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
152 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
506 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
169 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
141 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
107 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 ...
12
votes
4answers
556 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
2answers
236 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/...
8
votes
4answers
227 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
803 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 ...
-3
votes
1answer
205 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
177 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
97 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
335 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
322 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
140 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
4k 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 "...
31
votes
4answers
7k views

Dyson sphere with mirrors

What would happen if the entire inner surface of a Dyson sphere (not neccesarilly 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
175 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.
5
votes
1answer
192 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 ...
21
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 ...
0
votes
1answer
252 views

Is black light (UV) bad? [closed]

This question is based on the damage a solar eclipse can do to your eyes. In a parallel universe, the only light that reaches the Earth is the dark one — small amount of visible light and substantial ...
15
votes
5answers
3k views

How would a moon in geostationary orbit appear to wax and wane?

I've been working on my story planet and have come up with an unlikely but possible scenario to help explain some of my stories origins as well as myths and folklore. Over the last day or so, I've ...
5
votes
2answers
84 views

Sunshade communication?

Imagine we have a shade launched in space that can be turned opaque and transparent. We can use it to communicate in binary, and mathematically sound extraterrestrials can pick up the pattern. Of ...
7
votes
4answers
681 views

A world with only sunlight and a world with no sunlight (Fantasy)

I'm curious if it's possible for human life to survive in both of the following cases: 1. A fantasy world with only sunlight (no night). 2. A fantasy world with only night (no day). Note: let's ...
5
votes
1answer
286 views

Farming underground

Suppose the surface of earth is -349 Fahrenheit and survivors live deep underground dependent on geo-thermal energy. They do farming in tunnels. They have enough energy (heat, electricity), fresh air (...
8
votes
5answers
1k views

Sunlight and Vampires

I'm writing about vampires in my story and I'm curious what exactly it is about sunlight that makes them vulnerable to it. Are there any books or stories that define why the sunlight kills them? ...
1
vote
3answers
452 views

Is it possible that humans could ever evolve to handle the Sun's radiation without anything to protect us?

I was thinking about how humans have evolved from apes to what we are now, while apes still remain a species that isn't extinct. Is it possible that the human race will evolve into a species that ...
-3
votes
2answers
235 views

Generation ship: Artificial sunlight

The energy source both in terms of fuel and electricity on my ship is nuclear fusion. Very precise nuclear fusion: there is no helium fusion until there is absolutely 100% helium in the main fusion ...
1
vote
3answers
260 views

How can advanced alien overclock our Sun?

Space-faring aliens visits planet Earth for a holiday to enjoy some soothing sunbathing in Hawaii. They complain that there isn't enough bright sunshine after waiting for the Earth to be at its ...
48
votes
11answers
12k views

How long could the sun be turned off without overly damaging planet Earth + humanity?

Background story: Current Earth, in the close future. Astronomers have found first signs of extraterrestrial life: huge sheet-like objects (with surfaces easily as large as the surface of the Earth) ...
27
votes
13answers
6k views

With modern technology, is it possible to permanently stay in sunlight, without going into space?

Assuming one had access to all modern technology but couldn't go into space, would it be possible for the protagonist to permanently stay in sunlight? While it would be trivial near the poles during ...
6
votes
1answer
179 views

Planetary rings: colour of the rings and sky

What colour will planetary rings made up of dust and rock (not ice) appear to be? Would there be a difference looking from space and from the surface? More importantly, how will the rings affect the ...