Questions tagged [atmosphere]

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

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6
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1answer
176 views

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 ...
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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 ...
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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
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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 ...
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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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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 ...
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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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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 ...
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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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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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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 ...
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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 ...
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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 ...
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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, ...
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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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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 ...
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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 ...
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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 ...
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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
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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% ...
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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
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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 ...
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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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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 ...
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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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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 ...
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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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6answers
1k views

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. ...
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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 ...
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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 ...
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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 ...

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