Questions tagged [atmosphere]

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

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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
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3 votes
1 answer
74 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
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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
121 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
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-1 votes
0 answers
86 views

Can a person hypothetically fly without wings using electromagnetism? [duplicate]

I just realized that I have no scientific reason as to why one of the races on my planet that I am writing can just fly. No wings or anything they just have the ability to lift off the ground and land ...
Sketch Love's user avatar
5 votes
2 answers
82 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
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1 vote
1 answer
67 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
74 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
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12 votes
8 answers
3k 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
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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
132 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
110 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
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5 votes
1 answer
157 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
595 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
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5 votes
3 answers
147 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
164 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
333 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
  • 463
1 vote
0 answers
67 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
132 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
  • 8,692
3 votes
1 answer
183 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
78 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
78 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
102 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
695 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
5 votes
4 answers
2k views

Is fire possible in this planet's atmosphere?

Could a planet with this atmospheric composition have a fire: Atmospheric composition 42% nitrogen 53.8457% oxygen 2.5% carbon dioxide 1.5% argon 0.099% carbon monoxide and 0.0553% chlorine ...
user107608's user avatar
5 votes
0 answers
214 views

How does one calculate the baseline color of a world's sky, clouds, snow, and water?

I'm working on a planet for a book I'm hoping to write. I want it to be scientifically accurate wherever possible. I know that suspended particles can completely change these colors, but it looks like ...
ruinedanothergoodinstall's user avatar
3 votes
4 answers
891 views

How to explain an ocean planet having lots of greenhouse gases

How would I explain an ocean planet having a large amount of greenhouse gasses, I do not mean akin to Venus, I just mean enough to increase the size of the habitable zone by a sufficent amount. Enough ...
DanceroftheStars's user avatar
7 votes
2 answers
314 views

Temperature of an Earthlike planet in Mars location?

In the future, Mars has been successfully terraformed to be Earth-like in terms of atmosphere so that humans can inhabit it safely. If Mars had an atmosphere similar to Earth, but was still 1.52 AUs ...
gumbo's user avatar
  • 269
5 votes
1 answer
1k views

Could this hypothetical Super-Earth support human life?

The Question Could this hypothetical Super-Earth (Planet Y) support the lives of human settlers arriving from off world, or have I created any reasons for the planet to be inhospitable? Planet Y Star: ...
DangItBilly's user avatar
8 votes
3 answers
760 views

Could this hypothetical Sub-Earth support human life?

The Question Is a theoretical 2/3rds - 7/10ths Earth big enough to have the magnetic field, atmosphere and plate tectonics to do this, or will I wind up geologically killing the planet? I have been ...
DangItBilly's user avatar
8 votes
5 answers
2k views

Getting Water Vapour to Condense in the Lungs

So the human body temperature is much lower than that of the cave environment. That means that the air you're breathing is hotter than the inside of your lungs. In these conditions, the humidity from ...
casualworldbuilder's user avatar
1 vote
1 answer
541 views

Is my planet's atmosphere livable for humans?

My planet has a atmospheric pressure of 1.4 atm. The gases that make up the atmosphere are 79% nitrogen, 18.6% oxygen, 1.4% argon, 0.5% water vapor, 0.3% xenon, 0.02% CO2, 0.01% krypton, 0.17% other ...
Epiglottal Trill's user avatar
3 votes
0 answers
63 views

Would the atmospheric circulation experienced on my world's high platforms seem to be reversed?

In this world, that rotates in the same direction and at the same rate as Earth, where the land platforms that cover around 10-20% of the world's surface is (magically) suspended at the 1 ATM level, ...
Monty Wild's user avatar
  • 60.2k
-3 votes
2 answers
129 views

How can I avoid the runaway greenhouse effect on a planet with 2x Earth masses and a dense thick atmosphere?

I've been working on a spec bio project with a planet which is 2x Earth masses with a dense atmosphere. However, I have one big issue : how do I avoid making a runaway greenhouse effect? Like the ...
Jerry Robinson's user avatar
0 votes
1 answer
170 views

Colour of a Nitrogen rich atmosphere containing some SO2 and NH3?

I have a world orbiting an M7 red dwarf with an atmospheric composition like this: 96% N2, 2% NH3, 1% Ar 0.5% CO2, 0.5% SO2+Others At 0.2 bars, with an Ammonia ocean (if that changes anything) What ...
Fox Studios's user avatar
-1 votes
1 answer
243 views

Is this SpaceEngine atmosphere realistic?

Height of homogenous atmosphere: 15.26km Atmospheric pressure: 4.76 atm Air density: 4.8323kg/m^3 Air temperature: 45.704°C Speed of sound: 364.65 m/sec Exosphere temperature: 1255.9°C Greenhouse ...
casualworldbuilder's user avatar
2 votes
1 answer
104 views

Finding a stable atmosphere for a different gravity

I am trying to find what would be a stable atmosphere for a planet, using this https://docs.google.com/spreadsheets/d/1cW7BIWlBUscqS9MVqs5gSbPH0OGzyE-j2cz6ADBSVzE/edit#gid=0 (you have to make a copy ...
DanceroftheStars's user avatar
7 votes
9 answers
5k views

An atmosphere that gets denser with increasing altitude, to support these flying creatures

I'm thinking about implementing a race of flying creatures in my current setting: an earth-like planet with a breathable (enough) atmosphere. The easiest way to do this is just creating a race of bird-...
NimRad's user avatar
  • 1,120
3 votes
1 answer
267 views

Visibility of My "Psuedo-Aurorae"

I have been designing a habitable planet, its moon, and its star for a while now. Background My star is a K2V star with very strong solar wind and is about the age of the Sun. Every so often, when the ...
Neil Iyer's user avatar
  • 1,212
4 votes
2 answers
141 views

Adaptations for a planet with high atmospheric pressure, to avoid nitrogen narcosis?

I'm building a some hypothetical habitable planets for a book, and one of these planets has a thick atmosphere (around 10 bar). I'm not sure if it's even possible, but I want to figure out how the ...
Elhammo's user avatar
  • 975
2 votes
1 answer
87 views

Feasibility of a moon-planet orbiting an F star [closed]

I'm building an earth-type planet with typically human-like people, but a few differences. The human's particular area won't have much in the way of seasons being a large equatorial island. I'm ...
RedFrog's user avatar
  • 21
0 votes
1 answer
189 views

Designing a catamaran as workable masted airship for swashbuckling on the maindecks

I am crafting a hybrid power/sailing airship that needs an exterior scene similar to swashbuckling on the main decks among the sails. Putting a mast on an airship with a big round envelope just isn’t ...
Vogon Poet's user avatar
  • 8,179
4 votes
1 answer
223 views

On a planet with a 2 atm atmosphere, how would atmospheric pressure affect plant evolution?

Leaving aside the atmospheric composition (let's say there's the same amount of oxygen, despite the higher pressure), would the pressure itself have any effect? Would plants need to be stockier and ...
Elhammo's user avatar
  • 975
8 votes
2 answers
1k views

Xenon Anesthetic Hazard

I have been designing a planet with an atmosphere of about: Nitrogen (N2) - 61.5% Oxygen (O2) - 21% Neon (Ne) - 15.5% Xenon (Xe) - 1% Water Vapor (H2O) - 0.5% Argon (Ar) - 0.479% Carbon Dioxide (CO2) ...
Neil Iyer's user avatar
  • 1,212
1 vote
1 answer
203 views

How could a planet accumulate xenon in its atmosphere?

I am currently creating a planet with an atmosphere rich in noble gasses, especially neon, xenon, and argon. It's composition is roughly about this: Nitrogen (N2) - 61.5% Oxygen (O2) - 21% Neon (Ne) -...
Neil Iyer's user avatar
  • 1,212
6 votes
5 answers
2k views

How many airborne bacteria can I put into the air while keeping it breathable?

I have a setting where I want the atmosphere to basically be filled, heavily and consistently, with a bunch of small, airborne bacteria-like cells/microscopic biomatter. For the sake of keeping the ...
inkwell87's user avatar
  • 939
3 votes
3 answers
148 views

Would the substellar point on a tidally locked planet with a large continent over that point and oceans around the edges be covered in rainforest?

I have been working on a tidally locked planet for some time now. During this time I have worked under the assumption that the substellar point would be arid because of the constant bombardment of ...
treeg886's user avatar
4 votes
1 answer
485 views

Behavior of narrow straits between oceans

I am trying to build a world that would have two oceans separated by a narrow sea/strait/passage. Think of Drake's Passage, but bordered by large land masses from both north and south, like the ...
Maksim Ubaydulaev's user avatar
13 votes
3 answers
4k views

What would happen if lightning couldn't strike the ground due to a layer of unconductive gas?

My world has an upper atmosphere similar to Earth's, and a lower atmosphere compromised of Sulfur Hexafluoride and water. In between is a layer of clouds. Massive treelike sulfite structures stretch ...
Grant Cory's user avatar
3 votes
2 answers
155 views

Fire Analogue on Hydrogen Methane atmosphere Planet

Okay to summarize I have a planet with an approximate atmosphere of 44% nitrogen gas, 30% hydrogen gas, 23% methane and 3% other trace gases. I am working on an intelligent alien race on this planet ...
Venik Hue's user avatar
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