Questions tagged [light]

For questions concerning electromagnetic radiation in the visible spectrum.

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41
votes
5answers
5k 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 ...
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 ...
17
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3answers
987 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 ...
12
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6answers
3k views

How can I set a moon on fire?

So, for reasons which may or may not pop up in a later question of mine, I need to light a small Moon-like moon on fire. Well, sort of. See, I need a small object capable of emitting a lot of light - ...
1
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2answers
446 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 ...
8
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5answers
896 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 ...
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 ...
13
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7answers
16k views

How would lack of sunlight affect a human population?

Other than photosynthesis being an issue, if the Earth's surface became inhospitable and humans were forced to live underground, what biological changes would they be expected to go through to adapt ...
20
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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 ...
22
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17answers
4k views

Evolution of a creature that uses light as a weapon

On our world we have any number of creatures that use: Noxious Chemicals Poison(Spiders and Snakes being the obvious examples) Sound Electricity as an alternative to their teeth and claws. One ...
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 ...
9
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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 ...
21
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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 ...
8
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1answer
588 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 ...
10
votes
4answers
707 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 ...
10
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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 ...
14
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3answers
897 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. ...
4
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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 ...
6
votes
1answer
343 views

Could a light mage microwave your face?

First post, so I’d appreciate suggestions and help on how to make this question better. Question Suppose there’s a sorcerer with power over light. He can use these abilities to perform all the ...
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 ...
0
votes
1answer
102 views

Speed of light, Motionlessness, and Time Travel [closed]

i want to ask something I quote from some web and got this : 'According to Einstein’s Special Relativity Theory, time is affected by speed. It’s already been proven in the lab that subatomic ...
22
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13answers
4k views

Always a full Moon for the Emperor - Can this be achieved with solar panels and LEDs?

The Emperor of the World wants there always to be a full moon. His Scientific Advisor (the SA) comes up with a plan. He plans to cost out the venture, hand it over to the Keeper of the Treasury who ...
7
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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!) ...
6
votes
3answers
323 views

What would it look like in the accretion disk of a feeding supermassive black hole?

I wanted two characters unaffected by the heat and gravity to be close to a super massive black hole within the accretion disk, at times moving in orbit and at times completely still. Stars and ...
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 ...
3
votes
3answers
294 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?