Questions tagged [light]

For questions concerning electromagnetic radiation in the visible spectrum.

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-4
votes
2answers
47 views

Flying islands and shadows

Let's say you have a "planet" of floating islands, and you still have a star (In similar size and distance to our Sun) around which this collection of floating islands resolve (Or maybe the ...
25
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7answers
6k views

What does a solid, 1 mile diameter subterranean glass sphere look like?

There is a solid glass sphere that is 1 mile in diameter. It is completely covered in dirt and rock, except for one small room that is built adjacent to the sphere. One of the four walls of this ...
8
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4answers
983 views

What would mer-folk use as lights and soft surfaces

I'm writing a story where one of the main races is orca (killer whale) mer-folk. Being orcas need to breath oxygen from the surface so do they, this said they live in a halfly submerged cave...but it'...
4
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8answers
275 views

How would organisms adapt to survive darkness beasts? [expansion to my old question]

[This is an expanded/refined version of my old question: How would animals adapt to darkness-made beasts? ] Premise: 'Beasts'/Seraphins are other-worldly intangible beings (you can't touch them, but ...
5
votes
1answer
183 views

How far could you see the Andes from the Pacific on a flat Earth?

Several questions on related subtopics of vision distance on a flat world have been asked before, but this one remains unaddressed. Specifically: The answer from Euclidean geometry would be infinite (...
7
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4answers
672 views

Using frozen light as a starship shield

Frozen/Solid light Shields I can't find much online; but after listening to an Isaac Arthur episode where he briefly mentions frozen light, I immediately thought about the Hardlight items from the ...
10
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7answers
3k views

Would a sapient being sensitive to polarized light be able to see the angle of polarization in a photograph?

Many animals have the ability to see polarized light (or rather, are sensitive to the direction of polarization), most notably birds and bees but also a wide range of other animals including ...
8
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8answers
1k views

Is radar better than visible light in deep space?

On the earths surface, radar is pretty sweet. It apparently penetrates the atmosphere well and bounces back and can be detected. I think this has to do with the wavelengths absorbed by our ...
8
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4answers
152 views

how big does my creature's organ need to blind or stun predator of all size?

Ok so my creature will look like this They're not big, about 2 feet tall. They're technically amphibians but have the scaly hide of a reptile. They live near the sea. Their life cycle is similar to ...
3
votes
1answer
169 views

Science of Green Lantern and solid light constructs

Many know that the Lantern Corps of DC Comics are capable of constructing objects of any shape or size out of hard light using their power ring fueled by their emotions. However, I'm wondering what ...
5
votes
1answer
99 views

What can merfolk use to see in the abyss?

A particular species of merfolk inhabit the abyss of the pacific ocean, they belonged to the secret clan which was tasked by the Atlantean emperor to seek immortality elixir. The emperor ordered their ...
0
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3answers
107 views

How can a “magic” mirror flash blind people?

My "magic" mirrors are purely technological and are only able to transmit light. More precisely, they can display the visible and infrared spectrums, and communicate via radio waves. They're basically ...
39
votes
8answers
6k views

What light colors/bulbs should be used inside a spaceship?

I've noticed in recent scifi shows/movies such as the Expanse or Star Trek that the lighting inside spaceships have two characteristics: Punishingly blue lighting Dark/dimmed miscellaneous lighting ...
15
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6answers
4k views

How to create electric light with 1300s technology

I would like to have electric light bulbs. One should be at least as good as a candle. What we have: The technology level is generally early 1300s But we can create copper wire We have a ...
-2
votes
1answer
87 views

Why do some demons need mirrors to manifest? [closed]

Mirrors are a particularly interesting part of magic. They're gateways for otherwordly entities, cause bad luck when broken, and most importantly... There is a scientific explanation for all of that. ...
6
votes
4answers
330 views

How can my Mage Light spell work?

While I'm working on the Magical Artillery, let's look at another common spell. Mage Light is a very handy invention. When cast, the spell creates an orb, 13 cm in diameter. The orb radiates white ...
20
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10answers
1k 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
0answers
65 views

Is there a naturally occurring cycle I can use to synthesize a cycle of light (which impacts the magic of the reality)? [closed]

This cycle of light interacts with the flow of energy and willpower manipulated by the beings of this reality. Their magic is evolutionary/adaptive, and so the light cycle is a "natural" product of ...
-4
votes
1answer
85 views

What would be the most viable form of lighting in future bladerunner-esque cities? By viable, I mean widespread and efficient [closed]

Neon has been around for a very long time in cyberpunk narratives. LED seems like the way to go according to some of the responses - any other viable candidates?
4
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1answer
188 views

Mesas of hard(solid) light

I searched the site and found answers saying hard light can't exist. Apparently in the three years since the last question was asked, scientists started making inroads on making solid light a reality, ...
2
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5answers
155 views

How bright and lit up could cities be in the future?

Technology will obviously make lamps much brighter and with wholly new designs and functions like self-illuminating walls, surfaces and glowing objects. Genetic engineering could also create trees and ...
15
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6answers
12k 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 ...
6
votes
1answer
118 views

Would it be possilble to light the dark side of a tidally locked planet using fiber optics from the right side?

Assume planetary-scale cables are easily constructed, and subsequently ignored. I am assuming these cables would run just under the surface of the planet from one side to the other for minimal ...
-1
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3answers
159 views

Gravity and Light and the manipulation of space time

ANOTHER EDIT: I think the answers so far have made me realize that there's not going to be a way to do what I want creatively and adhere to anything resembling real universe physics. I appreciate the ...
0
votes
1answer
79 views

What practical considrations would a world forever trapped in cold, snow, and ice face? [closed]

I'm building a world - or rather 3 interconnected worlds of cold and ice. The idea is worlds in a snowglobe because of a mis-worded wish of "I wish everything would stay the same forever." The first ...
3
votes
1answer
78 views

How would colonization of different star systems affect safety equipment?

On Earth, most safety equipment as we know it is painted yellow, as well as other high-power machines. Safety jackets worn by construction workers are also as so. Blue light (the majority of the sun's ...
4
votes
1answer
98 views

How bright is the night with 18-22 AU distant star?

In my previous question, I asked about how close can two stars in a binary system be for planets around them to stay earthlike, assuming that both stars have very sunlike and both planets very ...
9
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3answers
3k views

Is it possible to create light that imparts a greater proportion of its energy as momentum rather than heat?

This is yet another question concerning lasers as employed by sorcerers in a particular fantasy setting, but this one pertains to the momentum that photons possess and whether it's possible to ...
2
votes
1answer
122 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 ...
3
votes
2answers
156 views

How well would a planet in orbit of a star above the Galactic bulge see?

I am making a story of a species who lives on a planet several light-years above the Galactic Bulge. With advanced technology, how much could they see from their vantage point? Could they carry out ...
96
votes
9answers
17k 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 ...
3
votes
4answers
229 views

What effects would we see on Earth if the speed of light universally increased? [duplicate]

Traveling faster than light poses all sorts of physics problems, so most hard SF has had to handwave FTL. But if light were faster, then ships could be commensurately faster without violating ...
4
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4answers
171 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 ...
8
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3answers
276 views

Anatomically Correct Color-Adjustable Eye

I'm providing an interesting twist on the Anatomically Correct series by focusing on a single body part instead of an entire organism. The following image depicts the average range of the cones of a ...
4
votes
3answers
213 views

What Should This Phenomenon Be Called? [closed]

I've been searching for over a week now, and I haven't found anything to describe the following: A floating spherical area of space that reflects light over a gradient. This is exclusively specular ...
3
votes
2answers
100 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)? ...
15
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3answers
1k 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. ...
6
votes
4answers
232 views

Visible light from the brain

I'm building a magic system where magic isn't just controlled by human brains, but is actively produced there. As a byproduct, when casting a spell, the brain generates a large quantity of visible ...
22
votes
13answers
8k views

Metal that glows when near pieces of itself

First question! I'm excited to see if anyone can help me. Any missteps are unintentional, but feel free to tell me so that I may learn. So, I've recently started brainstorming over a possible story, ...
3
votes
3answers
203 views

Which Stars Would Best Suit For the Habitable Zone of The Nine Norse Earths?

In an alternate universe, the nine realms of Norse mythology--Midgard, Asgard, Vanaheimr, Jotunheimr, Alfheimr, Hel, Nidavellir, Niflheim and Museplheim--are actual, real-life "Earths", in the sense ...
6
votes
3answers
305 views

How impossible would a bioluminescent plant-based lifeform be?

Looking for alternative sources of lighting for my current worldbuilding project so I couldn't help but wonder if a bioluminescent plant-based lifeforms could be realistically feasible. I'm just ...
10
votes
3answers
1k views

Deflecting lasers/plasma bolts/blaster bolts with lightsabers [closed]

In Star Wars, there's some shots where Jedi deflect lasers with their lightsabers. I know there's a law that says you can't go faster then the speed of light and lasers are light, so what is the ...
21
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11answers
5k views

Could there be a material that inverts the colours seen through it?

I had a vision of a creature that touched things, and wherever it touched, it left a mark opposite to the original colour. For example when it walked across the grass the grass had red footprints, ...
3
votes
2answers
207 views

Albedo of a planet like Crait

If a planet like Crait existed and was covered by (mostly) white sand, what would its average albedo be? Crait is a planet from Star Wars that has a thin layer of white salt on its surface.
6
votes
5answers
891 views

Creating Darkness

Can we create any electrical equipment which works in the opposite way to a bulb, such that is whilst it is switched on all the light in the surrounding area gets absorbed creating darkness?
1
vote
3answers
237 views

In Search of a Super-Bright, Super-Stable Star

Long ago, I asked a question on how to make possible turning the nine realms of Norse mythology--Midgard, Asgard, Vanaheimr, Jotunheimr, Alfheimr, Hel, Nidavellir, Niflheim and Museplheim--into nine ...
22
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18answers
6k views

Are there any medieval light sources without fire? [closed]

In a world of my story, which is loosely based on medieval times, fire disappeared. Are there any sources of lighting without fire that would be possible in a medieval setting? It is a fantasy book ...
7
votes
3answers
259 views

Could people harness the bioluminescence of a firefly?

The world I am creating is in a swamp that contains larger than life bugs; this includes fireflies. What I ask is, could the bioluminescence of their glow somehow be harnessed or used as a light ...
34
votes
13answers
7k views

What does the view outside my ship traveling at light speed look like?

World Rules: Travelers are able to move at the speed of light without disruption of their lives. Time passes "normally" for them. They think, breathe, love, cry, and steer the ship as if they were ...
10
votes
6answers
525 views

What light would my cloudy planet receive from a red dwarf star?

What light spectrum would hit the surface of a planet orbiting a red dwarf star? The planet is a humid greenhouse with a cloudy atmosphere and a strong ozone layer. Over 80% of the surface is water. ...