All Questions
Tagged with geology atmosphere
15 questions
2
votes
2
answers
140
views
What are some plausible, long-lived geophysical planetary processes which would consistently maintain reddish skies in a human-breathable atmosphere?
Note for clarity: By reddish skies I mean being reddish in the same way Earth's skies are blue. This should apply to the skies in general (not a localized effect), and it's preferable that it's an ...
2
votes
1
answer
135
views
Methods of releasing nitrogen from martian regolith
One important step in the proposed terraforming Mars would be to give the planet a nitrogen atmosphere.
Now, most assume that nitrogen, (along with water and other luxuries of the sort) would have to ...
- 8,701
6
votes
4
answers
914
views
How long is a terraformed mars likely to remain habitable without plate tectonics?
Whilst considering the terraforming Mars in my science fiction project, I realised something rather important: Mars has no plate tectonics.
That means that, assuming the humans in my project manage to ...
- 8,701
3
votes
1
answer
122
views
Geological activity and of superearth - cannonball moon system
I understand that this situation is hypothetical -- I just need a piece of advice to make it more realistic.
In my story, there is a superearth of 4,5 Earth masses and 1,35 Earth's radius, rotating ...
- 31
2
votes
2
answers
134
views
How plausible is my alien world? Effects of acidification
The theoretical world of Hēdran is the 2nd planet of a 7 planet system. It lies within its star' s (a G1.4) habitable zone, but with a hot jupiter gas giant only ~1 AU away it experiences heavy ...
- 295
7
votes
2
answers
287
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 ...
- 14.9k
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
5
votes
2
answers
186
views
How viable would it be to dig down on Mars to build an underground colony?
I want a colony on Mars that builds BOTH ways, up and down. Domes or structures that go up normally, but a large portion of the colony would be levels underground.
I think this would allow you to take ...
- 1,456
3
votes
4
answers
554
views
Underground Atmosphere
I have a terrestrial planet that is similar to Mars in many ways, a desert-like surface, thin atmosphere, and inhospitable to large flora and fauna as we know it.
This planet has ceased tectonic ...
- 2,910
22
votes
6
answers
5k
views
An iron rain to starve a planet
I have a generic Earth like planet, same atmospheric composition, and the same oceanic composition. The crust of this planet is predominantly silicon based but plenty of iron, nickel and copper. ...
- 52.9k
13
votes
7
answers
2k
views
Advanced civilization on planet with atmosphere only in large sinkholes
I want to have an Earth-sized planet (with similar gravity) with an extremely low-density atmosphere (comparable to Mars) at most of its surface. Complex life, including an information-age ...
- 2,438
-3
votes
2
answers
180
views
What can cause the formation of a water canopy above the Earth's surface?
Here is a link to the water canopy theory.
My question is: how this water could end up there, high above the surface?
I was thinking about two possibilities: a comet spreading ice/water as it ...
1
vote
2
answers
300
views
Would it be possible for a cave system to naturally exist at a different temperature and pressure than the surface?
If you had a planet with hostile conditions (25 atm pressure, 400° surface temp) would it be possible that a cave system could exist beneath the surface at a different temperature and pressure, or ...
- 21.3k
5
votes
1
answer
183
views
What should be adjusted for old Earth-like planet?
For story reasons, I'd like one planet habitable, plausible, but in some noticeable way older than Earth. Just not all planets are 4,5 bilion years. Tidally locked planet that orbit red dwarf, saves ...
- 10.1k
4
votes
2
answers
443
views
Desert planet's atmosphere and cavern system?
Ok, so I have this planet that I am still building.
It is a desert planet, its surfice is almost completely arid with a few exceptions such as snow deserts in the poles. There is sentient life in ...
- 68