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Questions tagged [atmosphere]

For questions about the gases which surround a planet or some other celestial body.

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2 votes
3 answers
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Atmospheric Improvement: Increased greenhouse gasses vs. increased pressure

In my scenario I am imagining a terraforming process, performed by a human-like civilization. The world that they chose to settle only receives roughly 20% of the sunlight compared to earth, due to it ...
Ben's user avatar
  • 255
0 votes
3 answers
78 views

Day-to-Night observable Sky on a Orbital (non-Niven, small ring)

I'm assuming a lot of things here, but trying to visualize some characteristics regardless. What would the skyline look like? Day/night, seasonally, etc. I'm imagining a structure that is a ring, but ...
Thomas F. Webber's user avatar
3 votes
1 answer
588 views

What color would the sky be in a multi-star system?

In this scenario, an Earthlike planet is situated in a quaternary solar system clumped into two binaries--a Parent, in which the planet orbits, and a Grandparent, in which the Parent binary orbits. ...
JohnWDailey's user avatar
  • 14.6k
0 votes
0 answers
64 views

How will the monsoons work in this boomerang-shaped supercontinent?

Back and forth, I have created a fantasy supercontinent shaped in the likeness of an asymmetrical boomerang, with its elbow enlarged to resemble a fish’s head pointing westward, its lifting arm long ...
JohnWDailey's user avatar
  • 14.6k
-2 votes
2 answers
86 views

In a fantasy world with an inconsistent atmosphere, which latitude would have an atmospheric density of 1.0 Earths?

Imagine, if you will, a fantasy world so fantastical in regards to physics that one of its telltale signs of disregarding the laws of physics is how atmospheric density is tied to latitude. At zero ...
JohnWDailey's user avatar
  • 14.6k
0 votes
0 answers
51 views

What would the weather and climate be like on an Earth-size Mars with an atmospheric pressure of 1 atm? [duplicate]

Assuming the planet still has the same atmospheric composition as the real-world Mars (95% CO2, 3% N2, and 1.3% Ar) and has a global temperature of 284K (10.85°C) based on the answer to my previous ...
Sam Biswas's user avatar
7 votes
3 answers
1k views

What if Mars were the same size as Earth with an atmospheric pressure of 1 atm?

With the abundance of carbon dioxide, and yet being 1.52 times farther from the sun, would it make the Martian temperature cold or hot? I am assuming that the composition of the atmosphere remains the ...
Sam Biswas's user avatar
1 vote
2 answers
86 views

Can a bird fly if the polar atmosphere is this thin?

Imagine, if you will, a fantasy world so fantastical in regards to physics that one of its telltale signs of disregarding the laws of physics is how atmospheric density is tied to latitude. At zero ...
JohnWDailey's user avatar
  • 14.6k
2 votes
2 answers
124 views

Evaporation phase runaway greenhouse planet, getting temperature and air pressure values

According to this video: When Earth reaches the Komabayashi–Ingersoll limit, it will reach the point where a runaway greenhouse can occur. In the evaporation phase, Earth will end up with an ...
casualworldbuilder's user avatar
3 votes
1 answer
166 views

minimum atmospheric nitrogen for nitrogen fixation?

what is the minimum partial pressure of atmospheric nitrogen for nitrogen fixing bacteria to actually convert nitrogen into usable forms like ammonia? currently writing history for life within a 120 ...
jan Losilana's user avatar
4 votes
4 answers
835 views

What are some plausible means for increasing the atmospheric pressure on a post-apocalyptic earth?

I want my post-apocalyptic science-fantasy setting to be at least plausible enough for people to suspend their disbelief comfortably, rather than having to ignore obvious physical fallacies. I want ...
Chromatic Realms's user avatar
4 votes
1 answer
146 views

If ancient Venus really were once habitable, what was its atmospheric composition and average surface temperature? [closed]

Some sources claim that billions of years ago, Venus may have had much cooler temperatures, enough for liquid water on it’s surface and these clouds on the day-side of Venus would raise Venus’ albedo ...
casualworldbuilder's user avatar
4 votes
3 answers
134 views

How much Methane could reasonably exist on a world with 6% (60,000 ppm) Oxygen in the atmosphere?

Let’s say I have a world that has an atmosphere similar to both Titan (lots of Nitrogen and organic compounds) and Earth during the Boring Billion. Oxygen is present on this world, but only about the ...
casualworldbuilder's user avatar
0 votes
0 answers
110 views

What would happen to the sky colour if SO2 made up 95% of the atmosphere? [duplicate]

Because of the Rayleigh scattering phenomenon, I'm interested in how the G2V-type star light would interact with this composition, especially how it would change the colour of the sky. What kinds of ...
Sam Biswas's user avatar
4 votes
1 answer
192 views

Dark clouds on gas giants

One of the gas giants in my star system has large areas of its atmosphere filled with cloud layers that are pitch black when looking at them from space. What material could those clouds be made of to ...
Juno's user avatar
  • 41
4 votes
2 answers
118 views

How to prevent ice caps from forming on cold planets?

I am currently working on one of the planets in my system, called Opea. Opea is a roughly earthlike planet in the furthest edges of its star's habitable zone (receiving half the sunlight as Earth), ...
Dione Moolman's user avatar
2 votes
10 answers
2k views

High atmosphere combat - designing the optimal bomber

I've done a bit of research about high atmosphere bombers, but none of my searches really address my issue. What features would allow a combat bomber craft to excel at high atmosphere (thermosphere-...
alkahest's user avatar
  • 1,397
9 votes
9 answers
2k views

How do floating plants get their trace nutrients?

The planet is a cold ammonia world. Its ocean is mostly made ammonia, with some traces of ices (mostly water ice) at the bottom of the ocean. The ambient temperature is 225ºK, and the pressure is 4 ...
Neil Iyer's user avatar
  • 1,553
10 votes
2 answers
358 views

Sky color other than blue

Is it possible to have a planet where humans can survive for >30min outside, where the sky color is anything but blue? In anime and sci-fi, there are planets with a purple / green /red / yellow / .....
subrunner's user avatar
  • 4,572
2 votes
0 answers
38 views

How do I determine the climate of a tidally-locked water-world planet around a red dwarf? [closed]

I am wondering what I can expect the weather, temperatures, etc. for a tidally locked planet around a red dwarf. How I can determine biomes and general climate based on location around the planet when ...
Aster's user avatar
  • 341
3 votes
2 answers
166 views

How would fires turn out in my planet's atmosphere?

So, my planet is a Halogen world (like Stephen Gillet's Clorox), it has an atmospheric pressure of 7.54 atm, with it being composed by: 93.09% N2 6.569% O2 0.201% Cl2 0.101% Ar 0.039% others (CO2, Ne ...
UltraLore's user avatar
3 votes
2 answers
130 views

Would a planet whose sun is always in one place have weather?

The world I’m writing atm has a planet whose sun is described as being permanently moved above its North Pole. Because of a lack of technology (and interest) in outer space, they wouldn’t have a ...
Rainsford's user avatar
9 votes
3 answers
708 views

Color for this sky [duplicate]

Based on the information given, what would be the color of the planet's sky? Here is the composition of the planet's atmosphere: Nitrogen: 64% Ammonia: 19.7% (edit: as answers have pointed out, it ...
Neil Iyer's user avatar
  • 1,553
0 votes
7 answers
1k views

Is it possible to make a planet full of water and at the same time without life?

It's me again, I want to ask if it is possible to make a planet full of water but it has no life, the idea that it is a planet full of water with small islands in which there is no life, here is the ...
Idon'tknow's user avatar
2 votes
2 answers
121 views

What are some plausible, long-lived geophysical planetary processes which would consistently maintain reddish skies in a human-breathable atmosphere?

Note for clarity: By reddish skies I mean being reddish in the same way Earth's skies are blue. This should apply to the skies in general (not a localized effect), and it's preferable that it's an ...
PedrohSpaceWolfy's user avatar
8 votes
5 answers
966 views

Can a Venus-like planet be habitable if it was farther from the sun?

Let's take a planet with an atmosphere as dense as Venus, where there are extremely high winds far above the ground, but it's fairly tame at the surface itself. Perhaps the clouds are made of a nicer ...
Sam Moon's user avatar
  • 631
4 votes
1 answer
147 views

What are the climatic consequences of existing on a planet with a dense and fairly cold atmosphere?

I am making a non-habitable planet (Name: Xoo-akedar) for my solar system. Despite being close to the star (see characteristics below), it has a dense atmosphere that prevents the heat from the star ...
Idon'tknow's user avatar
2 votes
4 answers
142 views

How would these floating plants not need to constantly adjust their gas bladder?

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 times larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with ...
Neil Iyer's user avatar
  • 1,553
4 votes
1 answer
116 views

How would these floating plants concentrate neon?

I am currently building a planet that weighs about 4 earth masses and it's radius is 2.3 larger than that of earth's. It is an ammonia planet (as the title suggests), and has ammonia oceans with some ...
Neil Iyer's user avatar
  • 1,553
15 votes
5 answers
6k views

Life on a planet with never-ending rain

I'm intrigued by the notion of life on a planet where rain is a constant presence. Imagine a world where precipitation never ceases, where the skies are perpetually gray, and the sound of raindrops ...
Alessar's user avatar
  • 521
3 votes
1 answer
133 views

Conditions of a piranha solution ocean

My super Earth has oceans of entirely piranha solution, that is, a mixture of sulfuric acid and hydrogen peroxide. The planet is very carbon rich and the crust is about 98% diamond and 2% quartz. The ...
tungstn's user avatar
  • 41
5 votes
2 answers
96 views

Microorganism chemosynthesis on an Ammonia planet

I am currently building a planet that weighs about 4 earth masses and is 2.3 earth radii long. It is an ammonia planet (as the title suggests), and has ammonia oceans with some dissolved water ice, ...
Neil Iyer's user avatar
  • 1,553
1 vote
1 answer
100 views

Green-appearing sun atmosphere composition

What would the composition of a planetary atmosphere would cause a sun to appear green (i.e. green sunlight) for most of the day? I don't mean a green sky, as similar questions have asked. If there ...
aliahy's user avatar
  • 111
4 votes
1 answer
84 views

Necessary distance for an ammonia world from Toliman

I am designing a planet that orbits the star Toliman, (Alpha Centauri B), which orbits well beyond the conventional Goldilocks zone. This planet has a similar radius to earth (6240 km) but its mass is ...
user98816's user avatar
  • 8,651
12 votes
8 answers
4k views

What would a glassed planet really look like?

While the Halo franchise has used it a lot, other franchises have also mentioned/threatened with the idea of glassing a planet. The sheer heat of the attacks used on the planet to make it ...
Demigan's user avatar
  • 45.5k
4 votes
5 answers
2k views

How would fire behave in an oxygenless atmosphere with a significant percentage of chlorine?

I’m mostly interested in chlorine since (as far as I understand) it’s the most viable, but I’m open to others as well (if it’s worth it). I’ve been working with a sort of “worldbuilding challenge” on-...
Octopodes's user avatar
  • 301
4 votes
1 answer
172 views

Procedural Atmosphere for exoplanet - pseudorealistic composition, pressure etc

I have a programme built in python and rust, procedurally generating stars, planets, etc. I have come to a point where I have to work on atmospheric characteristics, hopefully managing to get a pseudo-...
Hal's user avatar
  • 141
1 vote
1 answer
120 views

Characteristics of a moon harboring huge flying creatures?

I’ve been thinking for a while about an extraterrestrial species I had in mind that more or less resemble very large four-winged four-legged birds, and in the name of ensuring I don’t handwave an ...
controlgroup's user avatar
  • 5,455
5 votes
1 answer
169 views

Burning Steel as Firewood

On Planet FeC, residents commonly burn naturally occurring steel ingots as what we would call firewood. As with actual firewood on Earth, these ingots vary in fireworthiness: a large, "green"...
Ray Woodcock's user avatar
4 votes
3 answers
599 views

Is that an elliptical orbit gas giant?

Let's say there was a ship that went into orbit around a gas giant roughly the size of Jupiter. It's going to have a highly elliptical orbit so it's much closer to the sun during summer than in winter ...
Joe Smith's user avatar
  • 3,192
5 votes
3 answers
152 views

How small can you make a planet or moon and still have dust devils on its surface?

I want a moon for one of my planets to be larger than the Moon, enough to have an appreciable atmosphere, but not quite so massive as Mars. I'd like it to be that if you were to land on it, the thin ...
Axion's user avatar
  • 1,154
4 votes
1 answer
174 views

Weather and climate of an Earth-like planet orbiting an orange dwarf

I am creating a solar system with fictional planets as a setting for my space novel. Luckily I have some nice tools for creating quite accurate astronomical data. The planet where my protagonists live ...
Alessandro Miletti's user avatar
7 votes
2 answers
337 views

Could a cold-cored planet be protected by a hot-cored moon?

This is an earth-sized planet, unable to produce an adequately protective magnetic field. Could a moon with a hot, iron/nickel core produce a magnetosphere large enough to encompass the planet and ...
Valitenci's user avatar
  • 508
1 vote
0 answers
71 views

What would a supersonic breeze feel like? [closed]

Most of us have been in a 60km/hr gale, if only for a brief gust. It roars, it knocks down trash cans, it can make us stumble, but it isn't all that dangerous. The force of the wind can be estimated ...
Kevin Kostlan's user avatar
-1 votes
1 answer
135 views

Why would aliens fill a quarantine space with inert gas?

While experimenting on a Mysterious Alien Artefact at a Super Secret Research Facility, the protagonists accidentally activate what turns out to be a homing beacon, and teleport everything in a sphere ...
Stephen's user avatar
  • 8,754
3 votes
1 answer
192 views

Could a sky be green(day)->purple(dusk)->black(night) and still be breathable?

similar requirements but green. The reason this doesn’t answer my question is because I’d rather not have aeroplankton Similar story with this one and I want it permanently habitable. It takes place ...
Spaghetti_Writer's user avatar
1 vote
1 answer
80 views

How would hydrostatic skeletons respond to different atmospheric pressures?

I'm wondering whether atmospheric pressure (high or low) would have any impact on the favorability of hydrostatic skeletons. Obviously hydrostatic skeletons work well in water, but I'm not sure if a ...
Elhammo's user avatar
  • 975
0 votes
1 answer
96 views

Could the sky be a different color but the atmosphere still be breathable by humans? [duplicate]

I'm trying to explore possibilities for differences between earth and a different planet in my story. I'm wondering if I could change the color of the sky. When doing research on the subject I got a ...
Spaghetti_Writer's user avatar
1 vote
1 answer
121 views

Atypical Habitable Planets - Planets Outside of Typical 'Habitable Zone' With Characteristics Still Conducive to Life

Warning: I am wordy and I overexplain things. I'm also Autistic, so I may come off as odd or unusual (and that also feeds into why I overexplain LOL). I'll do my best to be clear and concise, but you ...
Kunabee's user avatar
  • 13
3 votes
2 answers
708 views

What atmospheric composition would this planet need for an avg. temperature of 50 Celsius?

Planet Info: Star: 1.25x solar mass / F6V Type / ~6300K / 1.97x Luminosity Planet is 1.84x Earth Mass, same density as Earth Orbiting at 1.42 AU atmospheric pressure is 3.68atm Inputting these ...
Foosic17's user avatar
  • 1,266

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