All Questions
Tagged with exoplanets or planets
2,759 questions
3
votes
2
answers
155
views
climate on a hemispherical planet (a planet cut in half) [closed]
An earth-sized planet has been cut in half along a meridian by higher beings. The gravity is experienced the same as if the other half was still there. Let's say there's a big magic wall that prevents ...
- 39
0
votes
0
answers
59
views
What would the weather and climate be like on an Earth-size Mars with an atmospheric pressure of 1 atm? [duplicate]
Assuming the planet still has the same atmospheric composition as the real-world Mars (95% CO2, 3% N2, and 1.3% Ar) and has a global temperature of 284K (10.85°C) based on the answer to my previous ...
- 91
7
votes
3
answers
1k
views
What if Mars were the same size as Earth with an atmospheric pressure of 1 atm?
With the abundance of carbon dioxide, and yet being 1.52 times farther from the sun, would it make the Martian temperature cold or hot?
I am assuming that the composition of the atmosphere remains the ...
- 91
0
votes
0
answers
45
views
Effects of Day/Night divide on airflow patterns on a binary planet
I'm currently working on a project with a binary planetary system (both planets are around .8 earth mass with some variation), and naturally, the planets are tidally locked to each other, leading to a ...
- 1,092
5
votes
2
answers
253
views
How would weather on a Cube-World with uniform surface gravity behave?
In a cube-world with uniform surface gravity with mildly rounded corners, how would weather behave? The Cube-world is roughly earth-sized, with the edges rounded by about a hundred kilometers. Gravity ...
- 473
1
vote
1
answer
111
views
How could a lone island on an ocean planet have a temperate climate?
Grenaplaza is an Earth-like planet populated by a race of half human half pig people called the Gammonfolk. Grenaplaza is unique in that it is an ocean world with one lonely island on its surface, ...
- 185
4
votes
6
answers
1k
views
Navigation on Mars without Martian GPS
Given that the orbital period of Phobos and Deimos are different, and are relatively fast (7.66 hours, and 30.35 hours respectively) compared to our Moon, would future Scouts of Mars be able to easily ...
- 706
-2
votes
2
answers
112
views
Astrology while living on Mars [closed]
Astrology has been done on Earth for centuries, based on the position of the planets with respect to the constellations.
Has anyone given thought to what astrology (whether you believe in it or not) ...
- 706
-2
votes
1
answer
92
views
Can a planet without a satellite be suitable and how will this affect its climate and appearance? [closed]
I want to create a planet where there will be 2 suns (small races nearby) and without the moon, so that it is very dark at night. But because of this there are many problems with water and geography, ...
7
votes
1
answer
88
views
Weather on a Hot Saturn
So, out of curiosity and for the purposes of a roleplay universe I am making, I am curious about the weather on a Hot Saturn. This planet, nearly identical in mass, composition and size to Saturn, is ...
- 413
6
votes
9
answers
3k
views
Would it be possible for a living being the size of a planet to survive? [closed]
I've been thinking what is the theoretical size limit of a living being? I asked myself this question:
Could a living being grow to the size of a planet?
This super massive organism would have its own ...
4
votes
1
answer
171
views
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
13
votes
10
answers
4k
views
How much time is needed to judge an Earth-like planet to be safe?
A colony ship has been sent to deep space to colonize an earth-like planet. Through astronomical spectroscopy, the atmospheric composition was found to be suitable for human life. But of course, ...
- 1,023
5
votes
2
answers
318
views
If an otherwise too massive planet rotates fast enough, would the equatorial region become habitable?
Ok, So I'm writing with an eye toward pondering the constraints of terraforming, which are more numerous than most people think, which creates a plethora of fun quirks and constraints for story ...
- 83
18
votes
8
answers
7k
views
If humans colonized Earth 100,000 years ago, would we know it?
Let's say that humans actually originate from another planet. An extinction level event happened on their home planet, and a handful of them escaped, wandering through space looking for a planet that ...
- 2,232
4
votes
2
answers
389
views
Could a civilization have existed on earth when our planet was much smaller, and as earth gained more size could it have grew around and above them? [closed]
I want to create a civilization that were living on earth when the planet was a much smaller protoplanet or a planetesimal. If earth grew over billions of years, could a civilization have existed ...
4
votes
2
answers
113
views
Could a mini neptune host life only above certain elevations?
So on a planet with a small gas envolope of say, 20,000 km, could you have a situation where life only exists above the envolope, on the mountains that poke through it? Is this theoretically possible?
- 2,232
5
votes
5
answers
1k
views
On a planet with 6 moons, how often would all 6 be full at the same time? [closed]
The cycles/orbital periods of the moons are 12, 20, 20, 24, 32, and 38 days. How often/after how many days would all 6 be full at once?
- 155
2
votes
2
answers
142
views
Would it be possible for a somewhat distant bianary star system to have a planet orbiting their barycenter within both their orbits?
There are 2 stars in a binary system, 268 AU apart from each other. Both are about 1 solar mass.
Would it be possible for some planet to be orbiting their barycenter (the center mass of both starts),...
- 5,163
4
votes
2
answers
125
views
How to prevent ice caps from forming on cold planets?
I am currently working on one of the planets in my system, called Opea. Opea is a roughly earthlike planet in the furthest edges of its star's habitable zone (receiving half the sunlight as Earth), ...
3
votes
1
answer
188
views
At what rate does my planet become tidally locked?
I am designing an alien planet for a speculative evolution project. It is slightly less massive than Earth and is orbiting around a red dwarf, within the Goldilocks zone. It takes 220 Earth days to ...
- 208
0
votes
1
answer
130
views
How would a monster be part of a planet's core? [closed]
Okay so I know this absolutely isn't possible but what is the most likely way this would be possible? This idea is also very much still in progress but I think asking this would help. I'm thinking of ...
- 11
10
votes
2
answers
414
views
Sky color other than blue
Is it possible to have a planet where humans can survive for >30min outside, where the sky color is anything but blue?
In anime and sci-fi, there are planets with a purple / green /red / yellow / .....
- 4,572
0
votes
6
answers
2k
views
Is it possible to relocate a planet? Specifically Jupiter [duplicate]
My world, Anyare, has too many people on it. Instead of having a disaster, I want them to colonize another planet. Like Jupiter. By using Jupiter’s gases, and by attaching a giant propeller, is it ...
- 25
5
votes
5
answers
666
views
Would the equatorial region on an alternative Earth spinning on two axes still be +/- 5° above the median "equator?"
Imagine, if you will, the Earth. It's happily spinning around its axis, which is about 23.5° off the perpendicular of its ecliptic. Now, for no scientific reason whatsoever, start a second spin around ...
- 132k
6
votes
3
answers
2k
views
Could Jupiter-like planet be able to radiate energy to sustain life on satellite?
I remember being taught about Jupiter being believed to be a failed Sun. I also am aware that Jupiter releases energy like the Sun. I am sure some of this is in relation to the sun as well. But due to ...
- 61
3
votes
2
answers
1k
views
Can a cube-shaped(ish) world have uniform(ish) gravity when composed of ideal materials?
I'm trying to design a cube world while sticking somewhat closeish to real physics, but am not entirely sure about the physics involved with objects of non-uniform density, specifically as relates to ...
- 473
1
vote
5
answers
599
views
Could a small (15km radius) planet (disregarding physics) have enough material for intelligient life to build on?
The planet's radius is 15km and has a similar density and gravity to Earth. For this question, most laws of our universe do not apply, meaning this is possible without any serious consequences. Could ...
- 133
3
votes
1
answer
98
views
Water distribution on tidally locked planet with small northern ocean
Possible repeat of this, but the northern ocean wasn't really addressed.
Picture a mars-like planet, with a rocky, mountainous southern hemisphere, and a flatter, low-elevation northern hemisphere. ...
3
votes
2
answers
180
views
How would fires turn out in my planet's atmosphere?
So, my planet is a Halogen world (like Stephen Gillet's Clorox), it has an atmospheric pressure of 7.54 atm, with it being composed by:
93.09% N2
6.569% O2
0.201% Cl2
0.101% Ar
0.039% others (CO2, Ne ...
- 33
8
votes
8
answers
4k
views
If the Earth stopped spinning, what's the ideal point for it to stop to ensure the most people survive?
Say the Earth were to stop spinning, and became tidally locked (or rather, stop spinning 366.25 times a year, and only once a year), through the machinations of a superpowered alien visiting down on ...
- 185
2
votes
2
answers
1k
views
The "Face" in Cydonia, Mars
I want to write a story in which colonists on Mars form a religion around their belief that the so-called "Face" of Cydonia is artificial - and they're right. However, the establishment ...
- 121
3
votes
2
answers
141
views
Would a planet whose sun is always in one place have weather?
The world I’m writing atm has a planet whose sun is described as being permanently moved above its North Pole. Because of a lack of technology (and interest) in outer space, they wouldn’t have a ...
- 31
9
votes
3
answers
724
views
Color for this sky [duplicate]
Based on the information given, what would be the color of the planet's sky?
Here is the composition of the planet's atmosphere:
Nitrogen: 64%
Ammonia: 19.7% (edit: as answers have pointed out, it ...
- 1,550
0
votes
7
answers
1k
views
Is it possible to make a planet full of water and at the same time without life?
It's me again, I want to ask if it is possible to make a planet full of water but it has no life, the idea that it is a planet full of water with small islands in which there is no life, here is the ...
- 81
3
votes
6
answers
712
views
Can you have a planet as bright as Venus orbiting at 1.0 AU with no significant atmosphere?
I'm basically trying to have a hot volcanic planet with lots of visible lava within a short distance of my pov planet, so that it would be large in the sky; orbiting at 0.9-1.1 AU. I want it to be ...
- 631
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 ...
7
votes
1
answer
177
views
How do Hill spheres work for binary planets?
A small moon is able to maintain a stable orbit around a planet at just under half the radius of the planet's Hill sphere. Most of Jupiter's moons are in this configuration, possibly made more stable ...
8
votes
5
answers
1k
views
Can a Venus-like planet be habitable if it was farther from the sun?
Let's take a planet with an atmosphere as dense as Venus, where there are extremely high winds far above the ground, but it's fairly tame at the surface itself. Perhaps the clouds are made of a nicer ...
- 631
4
votes
1
answer
154
views
What are the climatic consequences of existing on a planet with a dense and fairly cold atmosphere?
I am making a non-habitable planet (Name: Xoo-akedar) for my solar system. Despite being close to the star (see characteristics below), it has a dense atmosphere that prevents the heat from the star ...
- 81
3
votes
1
answer
174
views
Could a biological organism power itself with electricity like a smartphone (or something similar)?
Imagine an alien world where there are are shallow lakes where electricity generating beings (like electric eels or whatever) would power many of the land dwelling creatures, including the dominant ...
- 1,019
7
votes
3
answers
798
views
Feasibility of a bio-engineered, floating tree lifeform in the Venusian atmosphere?
Would it be possible, given many advances in genetic engineering that today remain speculative, to design a lifeform capable of withstanding the hostile conditions of the Venusian atmosphere?
I'm ...
- 71
1
vote
2
answers
363
views
I have a world with two moons, and I was wondering how often they would both be full at the same time
As I said in the title, I have a world with two moons. One has an orbital period of 17 days Earth days (Moon 1) while the other has an orbital period of 57 Earth days (Moon 2) and the planet they are ...
6
votes
3
answers
761
views
Frozen World Atmosphere?
There's a planet in my world's solar system that used to be habitable but was knocked off course. its been frozen for about 4 billion years in the present time.
I'm wondering if the atmosphere would ...
- 61
3
votes
2
answers
147
views
How to calculate the Draconic month on a fictional world
I am working on a world and want to be able to find out when Eclipses occur, and I found you need to know the Draconic Month, I think I have everything I need to find it, I have the inclination to the ...
- 589
6
votes
6
answers
3k
views
How could Venus be partially terraformed?
In my setting, Venus is still very much still hostile to a normal human without equipment, but isn't hot enough to melt lead and has a relatively low pressure compared to now.
How could this ...
user73401
6
votes
1
answer
916
views
Time dilation on a heavily oblong planet
Once upon a time writer Hal Clement had created a world named Mesklin. One of features he didn't detail for historical reasons is a time dilation between polar areas, where gravity is 700g and equator,...
- 193
6
votes
3
answers
438
views
Can a planet with rings support life?
Is it at all possible for complex life to evolve and exist on a planet with rings?
I assume the rings would have to be rock, since if the planet is to support life, it will have to be in the habitable ...
- 161
0
votes
2
answers
104
views
Plausible Martian Underground Colony
I'm looking for scientifically plausible zones for pioneer colonies on Mars. I will have them living underground for radiation shielding, water sourcing, and geothermal for energy, so somewhere with ...
- 11
2
votes
1
answer
114
views
Life in the core of a rocky planet
Background
First of all, I’d like to state that I know the entire premise of this question is hypothetical and the life probably quite unlikely to form in the first place at best. Despite that, I’d ...
- 1,550