Questions tagged [atmosphere]
For questions about the gases which surround a planet or some other celestial body.
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questions
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How high would a mountain have to be to have no snow on its summit?
On Earth (or another planet with an identical atmosphere), how high above sea level would a mountain have to rise so that its summit would no longer have any snow on it, not even temporary?
The ...
0
votes
1answer
106 views
Can there be an ocean in a CO2 atmosphere?
See my first question here and other things about atmosphere: What would be the color of a CO2 atmosphere?
Hi so I have a planet with a CO2 atmosphere so can there be any ocean on this planet?
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4answers
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What would be the color of a CO2 atmosphere
So I want to make a planet with an atmosphere made of
99% CO2
1% N2
It also has a pressure of 1 bar.
Its star is like our sun.
There is not that much dust.
It's 27.5 A.U away from it's star.
What ...
3
votes
1answer
72 views
Software for simulating a slice of an atmosphere?
For my world, I want to simulate a 2d vertical slice of an atmosphere, to test if my assumptions about it are correct. The software needs to support gas compression via gravity, different gasses used ...
6
votes
1answer
425 views
Is a fall into a high-pressure atmosphere survivable?
In my question What is the largest achievable oxygen-atmosphere world?, my answer suggests an atmosphere of standard terrestrial air with a sea-level pressure of 20 ATM and platforms at an altitude ...
5
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2answers
258 views
What is the largest achievable oxygen-atmosphere world?
I am trying to calculate the largest world that will meet the following criteria:
Exists within the Goldilocks zone of a G2V star similar to our sun.
Is survivable long-term by anatomically modern ...
7
votes
9answers
925 views
Can Advanced Matter-based Weapons Target Fast-moving Targets Deep in the Atmosphere Without Collateral Damage?
UFO's are real and fighting around the Earth!
I have an alien spacecraft in modern Earth's atmosphere, and rival alien spacecraft in Earth's Orbit. Both aliens are capable of maneuvering at great ...
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vote
4answers
621 views
Too much oxygen and not enough carbon
If a planet has a lot of oxygen to support mega flora and fauna, how much would be too much?
My planet has the oxygen content about that of the carboniferous(as a starter example), which had a about ...
4
votes
4answers
134 views
How to cool Venusian atmosphere down?
Carbon dioxide dominates the Venusian atmosphere. While I think it is possible to use the thermal energy in the atmosphere to split carbon dioxide to carbon and oxygen, the process may be too slow to ...
1
vote
1answer
106 views
Is it possible for radon to exist at consistent levels in an atmosphere for 10,000 years?
On an alien planet, could it be possible for a foreign species of aliens to somehow convert the atmosphere to consist of a small amount of radon (10% or less) for a fairly long amount of time (around ...
4
votes
2answers
392 views
Feasibility of the Ascendia System?
Some of the events in a story I'm thinking of have occur on a planet called Ascendia. Due to the world's backstory, it has several unusual traits.
Despite orbiting around a hot (roughly large F/small ...
4
votes
1answer
63 views
Convection Cells in the Atmosphere of a Jupiter-Sized Planet
Background
The setting for a story I am creating is an earth-like planet near jovian surface area, existing in a universe where the force of gravity is appreciably weaker than in our own, such that a ...
6
votes
2answers
225 views
Exposure to Atmospheric Ammonia. How to not die
A follow up to the previous post question, one of the point's raised in the question was that the atmosphere that is presented has around 0.7% of it's atmosphere made up of Ammonia which is ...
11
votes
7answers
3k views
Breathing on high oxygen world. What can be done to stop humans from dying?
Sometime in the near future, a sizable population of humans has transported, through unspecified means, to a habitable super earth that has a much higher oxygen content than on Earth. Now, to the lay ...
4
votes
6answers
322 views
Walking to space
Is it possible to have any kind of natural celestial body where at some point on it it's capable of supporting human life without technological assistance (breathable air, survivable temperature with ...
0
votes
1answer
58 views
Plausibility of Low-Pressure Breathable Atmospheres?
My question is inspired by the fact that in the computer game Elite:Dangerous, the player's spacecraft is capable of landing on planets with "tenuous" atmospheres, measured as being 0.1 ...
4
votes
2answers
104 views
Consequences of a Super-Light Super-Earth?
In this scenario, there is a rocky planet that is 230% the width of our Earth, covering a total area of a billion square miles, 55% of which consists of three continents separated by a single ocean ...
4
votes
2answers
160 views
What are the requirements for a scenario like the one depicted here? (supertall skyscrapers)
I have been very appreciative of the Netflix series Altered Carbon especially thanks to scenes such as those taking place in the location called Aerium.
For those who aren't in the know, the Aerium ...
3
votes
4answers
143 views
What atmospheric conditions would be needed produce intense heat, weather and wind that could fry a human in less than 5 minutes at sea-level? [closed]
first time poster here.
The premise:
I’m trying to design a planet in where sea-level / lowlands are an uninhabitable wasteland with temperatures that would fry a human in less than 5 minutes. In my ...
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1answer
99 views
The plausibility of this atmosphere? and what the problems that it case?
The atmosphere have ~1 atm pressure at sea level, It does have water ocean maybe 10-30% of the surface, also it supports tectonic plates so the carbon cycle does work, and the Ocean is made mainly of ...
3
votes
1answer
143 views
How long could a human survive in a near-pure CO2 atmosphere?
Imagine Mars's atmosphere has been mostly terraformed. By that, I mean that the surface pressure and temperature have been brought up to at least survivable values. (The atmosphere is still 95% Carbon ...
3
votes
1answer
105 views
How plausible is this planetary system with binary stars?
In my world, I have a binary S-type Solar System of Star-A and Star-B with these properties:
Star-A:
Luminosity: 0.86822 Sol / Mass: 0.98097 Sol / Radius: 0.91958 Sol / Radius of Hill Sphere: ~37.218 ...
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vote
1answer
75 views
Calculating the Atmospheric Properties of an Exoplanet
I am developing a double-star system filled with several planets, a few of which will be habitable. I also have a spreadsheet file full of all the planets information, from Semi-Major Axis, orbital ...
3
votes
2answers
581 views
I have a question about details for a floating continent in an alternative earth
How much shadow would a floating continent the size of Australia cast if the bottom most point of the continent rested at about a mile above Mount Everest’s peak?
EDIT 07/12/2021
I’m still trying to ...
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votes
3answers
177 views
Is it possible in the real universe for a planet to develop a thick Octaoxygen atmosphere?
I know how weird this question sounds and how the answer to it is probably NO at first glance, but I don't know enough about octaoxygen and oxygen to be 100% sure about the answer being NO and ...
0
votes
1answer
142 views
How far away can you see a bonfire? [closed]
From how far can you see a bonfire...
in clear weather/slight mist/heavy mist,
at midday/dusk/night?
(assuming an unobstructed line-of-sight)
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vote
0answers
60 views
What would weather be like on a smaller Earth that has the same surface gravity?
First, let me state my current understanding of things (with the help of Universe Sandbox), just in case it is wrong somewhere and thus my question is wrong:
To have the same surface gravity as Earth'...
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votes
5answers
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Can a planet harboring complex life be radioactively hostile towards Humans?
I am writing a story that involves the colonization of an exoplanet with very similar properties to Earth. This exoplanet would be orbiting a red dwarf, but due to certain factors (it's atmosphere and ...
4
votes
2answers
125 views
Biogenic Hydrogen on Terrestrial Worlds
There are a number of questions on here about possible exotic types of biochemistry on worlds with ammonia or methane oceans. Some of these point out that a plausible pathway would be a reducing ...
2
votes
2answers
157 views
What size/distance a planet should be from its star to have a dense atmosphere and not become a gas giant?
I have recently learned that should Earth form a tad farther from the Sun (at about the distance of Mars) it would have enough gravity pull to accrete hydrogen and not enough heat radiation received ...
2
votes
1answer
92 views
Different atmospheres [closed]
So in my world, I will have different atmospheres I won't go into much details on how they work but I wanted to ask what would be some interesting compositions you might think of to make them unique, ...
2
votes
1answer
87 views
Terraforming/adding a magnetic field on the moon:Could it affect our planet?
Many people write about terraforming of the moon(including me). Often ,it is not only about changing the atmosphere,but adding a magnetic field.However,we know that the moon does affect the Earth,and ...
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votes
2answers
155 views
Appearance of an Ammonia World's Atmosphere
I started the process of making artwork for an Ammonia World and realized that despite all my previous research on their abiotic and biochemistry, there was one thing I never quite settled on; what ...
4
votes
4answers
203 views
Pumping Oxygen into Titans atmosphere
In the future, humans build massive factories on the moon Titan, components of which drill tunnels down to the water ocean beneath the ice surface. Assuming the ocean is there, and that it's similar ...
5
votes
1answer
158 views
Alternate Biology/Xenoforming:Could the moon have a Chlorine atmosphere?
So I have this idea that a super advanced being travels across the galaxy and is terraforming/xenoforming every planet that CAN be modified for life, not just Carbon based Earthlike lifeforms but ...
2
votes
2answers
82 views
Would the temperatures in the troposphere and stratosphere change if oxygen levels increased significantly?
I need a way to make life possible in the troposphere and lower stratosphere for my scenario set in a distant future. My excuse to move life to these altitudes is to increase the oxygen levels in the ...
3
votes
1answer
147 views
Impact of sulfur dioxide on biochemistry
Curious artist, not a chemist, kinda dumb boi looking for some kind galaxy brains here.
Okay. So. I have this planet. Its atmospheric composition is fairly earthlike: 21.6% O2, 77% N2, 0.2% CO2, 0.4% ...
5
votes
1answer
96 views
How close to a star can be a tidally locked planet so to have moderate temperature on its dark side? [closed]
So, imagine an atmosphere-less planet, tidally locked to a sun-like star. How close to the star can the planet be before its dark side becomes too hot?
I imagine that at some point the rocks on its ...
4
votes
1answer
380 views
What would the atmosphere of the Archaean Earth look like? (Before massive oxygenation)
I am designing an exoplanet in the Alpha Centauri system that is remarkably like ancient Earth before photosynthetic life developed and proliferated oxygen into the air.
For Archaean Earth's ...
3
votes
1answer
143 views
Is a dense CO2 atmosphere compatible with an ocean
As part of an ongoing effort to update a planetary classification system for sci-fi settings, I'm trying to nail down if an old idea for an exotic type of life-bearing world is actually plausible and ...
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vote
0answers
64 views
Does twice the planet radius mean two bands of desert per hemisphere?
Earth has three convection cells per hemisphere, resulting in each hemisphere having a band of desert at the end of the Hadley cells.
Given a planet with the following characteristics:
Twice the ...
4
votes
1answer
86 views
What would it look like if an artificial atmosphere began to disappear?
In my SciFi-Magic RPG campaign, the main characters are on Mars, which has been converted to a prison planet.
A large device, drilled into the north and south poles, reaching into the core, heating ...
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vote
4answers
132 views
Rockets and spacecrafts cannot fly: why?
Building up from this question, let's say that we have a lighter situation where:
The Earth has lost its magnetic field
Solar winds are interacting with the atmosphere
Molecules are split up due to ...
3
votes
1answer
111 views
Can a water world be turned into a dryer habitable planet by an early runaway greenhouse effect?
Consider an Earth clone with oceans several hundred kilometers deep, potentially deep enough to solidify into exotic ices. Such a planet would lose its initial hydrogen and helium atmosphere when the ...
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votes
6answers
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Which is a sound scientific explanation that prevents rockets to fly in rarefied atmosphere?
The world has lost its atmosphere. It has flown away, because the magnetic field is weakened and solar flares are making everything slowly fly away in space.
NASA has its own rockets and shuttles and ...
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3answers
855 views
What are the atmospheric/planetary effects of having no solar wind?
Suppose we have an earthlike world orbiting an artificial star which produces light but no solar wind. I would like to understand the implications that a lack of solar wind would have for the planet. (...
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3answers
600 views
How can I give my habitable planet argon in its atmosphere?
I want my planet's atmosphere to have roughly 10% argon so that its inhabitants can easily use it to color their lights purple. But I'm not sure how to explain the cause of this high argon content. ...
3
votes
2answers
249 views
Does it ever make sense to create a lunar atmosphere?
Relevant to this question. NASA says the very thin vacuum like Lunar atmosphere has sodium and potassium Does creating a very thin vacuum like lunar atmosphere of the metal atoms leftover after mining ...
10
votes
3answers
671 views
Placing a planet on the famous Escape Velocity Graph
If I'm understanding the chart correctly, in order for a planet with lower gravity than Earth (smaller than Earth), but with decent magnetosphere, to hold on to an atmosphere with oxygen, and water on ...
7
votes
1answer
601 views
A universal formula to predict which gas can or cannot stay within bound of a natural satellite or planet?
Given the following graph: ,
Relations exist among the escape velocities, molar masses of gases and the masses of natural planets and satellites. Is there a general math formula where inserting a ...