Questions tagged [light]

For questions concerning electromagnetic radiation in the visible spectrum.

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9
votes
2answers
563 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 ...
-2
votes
1answer
204 views

How would computer monitors work if we could sense the frequency of light?

Human's abilities to perceive light is quite limited. Essentially, we have three type of light sensors that each give a linear signal, and if two different light sources give the same signals they ...
3
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2answers
198 views

How to make glowing rain/mist?

So I've been playing Xenoblade Chronicles 2 and one of the effects that is used through the game (and the series really) is that ether (the game's version of mana) can often be seen floating in the ...
5
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3answers
543 views

A double-bright Moon and plant growth

It's Earth and the moon with all parameters as they are in real life with one exception, the moon is twice as reflective as usual. Instead of an albedo of 0.12, the moon has an albedo of 0.24. This ...
-5
votes
4answers
228 views

The Planetary Light Curve

I know that light can be affected by gravity. But what if there was a planet where if you shone a light in a direction and it could hit your back. I'm talking about a planet where light is bent around ...
18
votes
9answers
977 views

Compressed air lighting?

So I've got this civilization that doesn't have electricity, but does have municipal power distribution via compressed air lines. Now, you can do a lot of useful things with compressed air. Even in ...
1
vote
1answer
83 views

What would be more effective for a Shkadov thruster? An entirely white one or a mirror one? [closed]

A Shkadov thruster is a megastructure which reflects all light from a star in a given direction. What reflects more radiation, a white or a mirrored surface?
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 ...
16
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5answers
2k views

How would a microscopic organism create kilometre long fibre optic cables from ice

My story premise is that a human expedition to Europa has happened and the travellers have tunnelled through the ice and formed a colony in the ocean. When they breached into the ocean, they ...
7
votes
5answers
128 views

What traits/actions must give away a light-sensitive out-dimensioner? [closed]

There is a sub-dimension of this reality where a race of humanoid people lives in very low light. Their race has done so for hundreds of years - everyone there has no experience of being outside their ...
-2
votes
1answer
263 views

How would vision be distorted if gravity was 178 000 times higher on earth's surface? [closed]

Ignore any other effect on earth; I'm only curious about how much and in what way gravity's affect on the light would distort what is seen by the eye. :)
0
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4answers
172 views

Multiverse Premier League [closed]

My parallel universe has the speed of light set at half that of Earth's (1.5*10^8 m/s). How would a Badminton player (P.V Bindu) from Dearth (my universe) fare against a player (P.V Sindhu) from ...
3
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3answers
144 views

Confusing predators with reflected or refracted sunlight

Imagine a large butterfly- or moth-like creature, with a wingspan of about one meter (it's moth-like, not actually related to Earth insects). It lives its entire life high in the open sky, never ...
5
votes
3answers
211 views

Flooding lights

I am designing a world with no sun, there is something similar to asteroids in a nebula, not having a sun means no light so I decided to make that "nebula dust" glow, this dust has the following ...
20
votes
3answers
1k views

How large of a telescope would one need in order to read someone's lips on a planet light years away?

If I wanted to image an Earth-like planet at a resolution where one could read the lips of a human speaking on the surface 1, 10, and 1000 light years away, how large would the telescope reflector ...
4
votes
12answers
2k views

How could there be a horizon on a flat earth?

I'm building a world that happens to be flat. Well, it has hills and mountains, but no curvature. However, I still want to limit the eyesight to a few kilometers even if there are no hills around. I ...
2
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3answers
265 views

What are some alternative methods of perception on 'dark' worlds?

For instance; life manages to develop on a planet orbiting a black hole. What are some methods that native life could use for perceiving the environment around them? (e.g. echolocation, sonar, gamma-...
3
votes
2answers
276 views

How to make a planet with differential gravity and constant daylight

I am hoping to create a planet with a greater rotational speed, making it oblong, thus causing differential gravitaion from the equator to the poles. I am hoping for the gravitarion to be lighter than ...
21
votes
5answers
3k views

What are the main problems with beaming light from the Sun to Saturn?

I recently finished reading the Kim Stanley Robinson novel 2312 - set, of course, in the year 2312. Part of the background to the political negotiations and ongoing terraforming in the outer Solar ...
10
votes
4answers
709 views

What could make a star violet?

Part of a series I'm starting since the recent What could make a star green? did quite well and others could use the information here in their worlds. There aren't any "violet" stars. When a star ...
94
votes
9answers
16k views

What could make a star green?

Stars are never green. When a star's spectra "peaks" in the green range, it also releases a significant number of waves of the adjacent colors - so "green" stars appear yellow or white. I want a ...
10
votes
3answers
917 views

Can we identify distinct “colors” beyond visible light?

Let's talk about the visible light "rainbow" In almost all depictions of the electromagnetic spectrum, visible light is shown as a rainbow, and adjacent parts of the spectrum are monotone in color - ...
2
votes
3answers
618 views

Adding mass to light (In laser weaponry) to convert it to kinetic energy

The fictional tech: Lets say I have a crystal, that when a light waves pass through it, imparts some of it's mass onto the light wave. - This is handwave and I'm cool with it. The crystal is ...
1
vote
2answers
447 views

Could a photonic engine actually work?

I have a very specific aesthetic in mind for my science-fantasy setting, technology is largely pneumatipunk supplemented with weired phonotic devices;for "reason" there are few electrical devices in ...
0
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3answers
134 views

scientific explanation for lack of a shadow [closed]

i am curious to know how to scientifically achieve the lack of a shadow for a person. what would have to happen technology wise for a person not to cast a shadow in direct sunlight. i have only ...
13
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4answers
8k views

Does mirror armour work against laser guns?

The next war will be fought with lasers beside computers, I'm wondering could a bullet proof vest coated with a highly reflective surface protects user from laser blast. The laser in question is ...
33
votes
8answers
7k views

A monochrome planet

I am asking if a planet with shades of gray only is scientifically possible in our universe. Basically everything on the surface of this planet would seem black and white to the human eye. Here are ...
6
votes
3answers
468 views

Effects of a Moon-sized Sun-Cannon on Earth

Inspired by this answer, If that Lunar-plant is used as a weapon (pointed toward specific cities/forest/seas/lakes), how much damage it could really do? Is that able to burn cities, or anything? I ...
12
votes
4answers
546 views

Would a circumbinary planet have a differently colored sky depending on which star was visible?

One of the things that affects the color of the sky is the wavelengths of light that the star emits, like the image in this question. Here is the image again: If you are standing on a circumbinary ...
9
votes
3answers
1k views

Sky color of an alien world

I'm asking for a world I'm making, which orbits a red star. According to this image, there is a star that would make the sky white. What would the sky look like during sunrise and sunset on a planet ...
4
votes
4answers
490 views

How would gear that could protect from extremely blinding light function?

By 'extremely blinding light', I mean light at least bright enough to blind somebody permanently, and at most bright enough to severely burn humans. What material could be used to construct a helmet ...
8
votes
1answer
589 views

Ultraviolet bioluminescence

Bioluminescence is badass. It involves living beings emitting bright light in the visible spectrum. Would it be, though, possible that a lifeform emits UV (ultraviolet) light? Does it occur in ...
5
votes
1answer
248 views

Light Emitting Animals - What happens to the food chain? [closed]

In my world, an event has happened, some nuclear fall-out caused every animal to grow a special organ that emits light, but I'm wondering what effect that would have on the Food Chain? The world I'm ...
-8
votes
4answers
218 views

How realistic is it to obliterate planet killer with light only?

For this purpose you may make the following assumption: No magic, miracle and hope. The asteroid should be on a collision course for us Threat level is omega. Collateral damage must be keep to ...
2
votes
2answers
237 views

Can a theoretical case be made for “transporting” consciousness via light?

I'd like to develop a baseline of information for pondering this topic: Assumptions I assume that "consciousness" is a definite, precisely-knowable phenomenon. [I recognize that at present we have ...
11
votes
4answers
1k views

Blacklight Star

Tangentially related to The evolution of neon kittens Is is possible for a star to radiate in the ultra violet spectrum but not much in the visible light spectrum? If not, is there any mechanism ...
32
votes
8answers
6k views

How would lighthouses work in space?

In my world spaceships are guided by lighthouses floating in space instead of electronic navigational systems. A lighthouse in space has the shape of a huge sphere emitting intense red light. Like the ...
6
votes
6answers
2k views

What would happen if photons had a mass equal to 1/100 of a hydrogen atom? [closed]

As we know, light has no mass. Well light having mass is the primary problem with fast(er) than light travel. Thinking about this classic, yet sad problem made me wonder, what would happen the the ...
14
votes
3answers
898 views

What would this nebula look like from a planet?

I have a binary system. The primary star is F- or G-class; the secondary is K-class, 20AU away, and in a small reflection nebula (suggested here). A planet orbits the primary in the habitable zone. ...
3
votes
4answers
245 views

What would the effects be of a world where darkness took precedence over light?

Just yesterday I was thinking about how light takes precedence over darkness. What I mean by this is that a small light still shines through a large darkness; darkness is defined as the absence of ...
8
votes
5answers
898 views

A more alien world: Flora

In the (relatively new) Star Trek movie Into Darkness, we see Dr. Bones and Captain Kirk in a world composed mainly of red plants. Obviously these are just eye candy with no real basis behind it, but ...
2
votes
3answers
292 views

Someone born and raised without light

Please note: I've seen this and this, but my question is different as it is about a single human generation. If a child was born and raised in an environment with a lack of light, (i.e. a cave, or ...
10
votes
3answers
1k views

What would the eyes of a cave-dwelling race be like?

So here's the deal: In a D&D-fantasy-style world, the continent of Archaon is inhabited by a wide variety of elves, whose physical characteristics vary based on their dwellings. The forest elves ...
17
votes
3answers
989 views

Apparent Color of the Sun and Sky

The game Rodina features four planets, all with different colored skies. For some reason, the sun is a different color from each planet's surface (use this guide for reference). The four planets, in ...
5
votes
2answers
260 views

Is moonvertising feasible?

As the legend goes, Coca-Cola was planning on shooting lasers at the moon to project their logo. Unfortunately, the FFA said no (they didn't want planes to be blinded). I haven't been able to confirm ...
3
votes
3answers
297 views

Consequences of perpetual daytime on plants growth

What would happen if a planet like Earth were to be tidal locked to the sun? What effects could it have on lifeforms like plants? Would they always produce oxygen?
41
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5answers
6k views

How do seasons work in a binary system (planet orbits one star, not both)?

I have a planet orbiting one star in a binary system. When the planet is exactly between the two stars it will experience a double day; when the primary sun sets the secondary one rises, no overlap. ...
18
votes
5answers
1k views

How can I safely brighten my secondary star?

I have an earth-like planet orbiting one of the stars in a binary system. I have learned that, for G-class stars, if the secondary star is 100AU from the primary one, I can expect the secondary star ...
-1
votes
1answer
73 views

Photons as propellers [closed]

If I point a torch light backwards in space, why don't I propel forwards because no matter how small the mass of the particle is , in space you move forward with the same speed you imparted to the ...
7
votes
8answers
3k views

How would life evolve without light?

I'm designing a world similar to Earth (liquid water, temperate climate, there is an atmosphere, oxygen and complex life everywhere). The only big difference is that there is a giant (not glowing!) ...