All Questions
15 questions
4
votes
1
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171
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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 ...
- 1,347
3
votes
2
answers
735
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 ...
- 1,364
3
votes
3
answers
2k
views
Could my planet be habitable (Or partially habitable) by humans?
Set up
I'm currently building a planet that I want to have both alien life forms and humans. It has the following traits:
Humans migrated from Earth a long time ago, but only landed on the planet 24 ...
2
votes
2
answers
378
views
How deep would a canyon on this planet have to be to have an earth-like atmosphere?
I have, for a while now, been intrigued by the planet Canyon in Larry Niven’s Known Space universe:
Canyon was once an uninhabitable Mars-like world known as Warhead. It
is the second of seven ...
- 8,701
4
votes
2
answers
441
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 ...
- 610
2
votes
1
answer
697
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 ...
- 1,031
3
votes
1
answer
184
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 ...
- 17.2k
10
votes
3
answers
1k
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 ...
- 4,948
2
votes
0
answers
61
views
Alternative Ozone Layer [duplicate]
The reason for the high level of Oxygen in the atmosphere today is due to the billions of years worth of photosynthetic prokaryotes releasing it as a waste product. Of course, in the higher levels of ...
- 819
5
votes
2
answers
804
views
Atmosphere of habitable world around K-type star
I'm trying to work out the parameters of my planet, using the spreadsheets that Artifexian has developed (particularly this Planet Calculator and this Atmosphere Calculator) as a guide. In order for ...
- 629
3
votes
5
answers
662
views
How can this habitable planet have a moon with a naturally occurring atmosphere?
Assuming the planet is earth-like, with more surface water and atmospheric oxygen, and within the habitable zone of a sun-like star, how can a moon orbiting this planet retain a thick atmosphere?
The ...
- 1,193
9
votes
5
answers
3k
views
Is this atmospheric composition breathable, and what would it look like?
I have developed a fictional planet with the following atmospheric composition;
60.4% Nitrogen
27.6% Oxygen
9.8% Xenon
1.5% Water Vapor
0.64% Argon
0.06% Carbon Dioxide
Is this breathable to humans ...
- 383
-4
votes
3
answers
232
views
Would humans, and animals be able to survive on this planet?
My question is pretty simple, all the details about the planet are pictured below.
- 2,319
7
votes
2
answers
1k
views
What Is The Minimum Size Of A Planet To Harbor Human Life?
What is the minimum size of a planet that could harbor human life? You get to decide what the atmosphere is, but I'm reasonably sure that O2, CO2, and H2O are necessary components of the atmosphere. ...
- 7,026
14
votes
4
answers
4k
views
Is it possible that a gas giant of similar size to Jupiter could harbor life?
Say we had a planet which was a gas giant. Is it possible that at the core of the planet where meteors, asteroids, and comet debris had collected that there could be a layer of atmosphere similar to ...
- 612