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10 votes

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

A planet with water but no life is 100% plausible. But your atmospheric composition is not plausible — a large amount of free oxygen without life is difficult to explain, and large amounts of both ...
Mike Scott's user avatar
  • 20.3k
8 votes
Accepted

Color for this sky

Brown: (The surface of Titan, as taken by the Huygens probe, image credit ESA/NASA/JPL/University of Arizona via wikimedia The key thing here is the formation of tholins from atmospheric methane ...
Starfish Prime's user avatar
8 votes

Color for this sky

Based on the data provided and the star type, you can infer the color of the sky using the following ideas: Rayleigh Scattering: With nitrogen constituting 64% of the atmosphere, it scatters blue ...
cconsta1's user avatar
  • 1,279
6 votes

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

With the caveat that since we've only ever seen life here, so all of these answers involve some speculation, there's a few things you might suggest. Lack of Phosphorous (or some other vital piece) ...
Wavedash's user avatar
  • 357
6 votes

Color for this sky

Impossible A 4atm atmosphere with about 20% ammonia makes about 0.8 bar partial ammonia pressure. However, ammonia is liquid at 225K, and its saturated vapor pressure is far below that (about 0.4 bar)....
Gray Sheep's user avatar
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4 votes

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

sun is described as being permanently moved above its North Pole. what you are describing is physically impossible. It is possible to have the sun fixed at a position in the sky. Those who have ...
L.Dutch's user avatar
  • 289k
4 votes
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Is it possible to make a planet full of water and at the same time without life?

The inexplicable amount of hydrogen in the atmosphere points out to some weird shenanigans going on there. Why haven't it burn with the oxygen, or floated away into space? Something must be generating ...
Going Durden's user avatar
  • 3,626
3 votes

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

It just hasn't happened yet We lack data to know how inevitable life, but chances are that earth-like planets exist where life just hasn't happened yet. Perhaps in-opportune changes in climate cut off ...
N Brouwer's user avatar
  • 316
3 votes
Accepted

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

This is a weirdly difficult question to answer. The value you're probably interested in is called limiting oxygen concentration. Wikipedia, quoting from "An Introduction to Fire Dynamics" ...
Starfish Prime's user avatar
3 votes

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

No magnetosphere means the planet is constantly sanitized by solar radiation I just went over all your stats and it looks like you didn't mention a magnetosphere of any significance. While this would ...
Hobbamok's user avatar
  • 4,342
2 votes

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

Not quite what you're describing, but a tidally locked planet rotates at the same rate it orbits its star, so the sun never moves in the sky. Such a planet would definitely have weather, and it would ...
talrnu's user avatar
  • 1,791
1 vote

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

Your planet has 4x less oxygen than Earth' Example case, Fire under various oxygen percentages
LazyReader's user avatar
1 vote

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

I think yes. No calculation here. What you need to do is a planet with a thick layer of water, so water on the bottom would be iced by the pressure. For example, on Earth, it would be oceans deeper ...
Emile De Favas's user avatar
1 vote

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

Yes, this would be easily possible. With our sample size of 1, we have very little idea of what exactly is needed for any kind of life. You wouldn't even need a super complex explanation for it.
Bubbles's user avatar
  • 809
1 vote

Flying or swimming in supercritical CO2?

Supercritical carbon dioxide is not terribly dense. You'd have to work pretty hard to flap your wings to stay afloat in it. In this sense moving in SCF is like flying. Similarly, SCF is not very ...
Hugh Perkins's user avatar

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