Questions tagged [planets]

For questions about any large astronomical bodies classified as planets, and their effects on their systems.

Filter by
Sorted by
Tagged with
1 vote
1 answer
30 views

Can a habitable S-type planet and three habitable P-type planets exist in one binary star system?

In this solar system are two stars, named Genesis and Exodus. Currently, I don't know the types because the need of habitability on the planets might affect the requirements for these stars. They ...
  • 177
9 votes
4 answers
1k views

A perpetually noisy world

I want to have an alien species have trouble communicating with the hero(s), I've decided that this will be done in part because they don't even understand the concept of hearing, as in non of the ...
  • 6,739
10 votes
5 answers
2k views

If Earth's atmosphere is technically violet but our eyes can't see it, is there a possible variable that can let us perceive that?

There are a LOT of unworked holes in this, but the basic premise is my planet is a P-type orbit in a binary star system where these two stars have close orbits around each-other in order for the ...
  • 177
1 vote
1 answer
103 views

could an equator-round elevator be possible for passing through rings of a planet to reach the moons?

I am developing a terrestrial, habitable planet with rings about the width of Uranus' rings. Not extremely thick, but still noticeable. I have heard that rings on planets would cause an inhabitable ...
  • 177
8 votes
4 answers
210 views

How do I make longer seasons realistic on an earth like planet?

I am making a setting for a various TTRPGs that me and my friends want to play. I want this world to have longer seasons than earth. I was thinking about 3-4 earth years each season. This is difficult,...
  • 89
-2 votes
0 answers
48 views

Living in mars in the future [closed]

Is it possible for humans to evolve to survive in mars? Or is it possible to make a genetic accelerator so that humans are more suitable in surviving in mars?
  • 1
5 votes
4 answers
530 views

Justification for using Saturn as a future base for colonization

Despite being a gas giant, and being chilly cold, there are a few reasons I believe Saturn would be an ideal habitat for future colonisation, and here are a few justifications: Saturn actually has a ...
3 votes
3 answers
146 views

Saturnian Cloud Cities Pt. 3- Wind Turbine Problems

This is my third question in the series "Saturnian Cloud Cities", the previous question is "Ice Harvester Planes" The Saturnian cloud city consists of a giant Titanium-Graphene ...
2 votes
1 answer
72 views

Tides on a tidally locked planet

Picture the classic Earth-like tidally locked planet, with a frozen dark side, a boiling stormy light side, and a thin strip of habitable land along the terminator. The planet is similar in size and ...
  • 1,035
5 votes
1 answer
66 views

Could any photosynthesis occur at 5.5 AU on a warm planet?

I'm designing a habitable planet orbiting an M-dwarf, which is orbiting a G star at 5.5 AU. The orbit around the G star keeps the "night-side" (not technically an accurate term in this ...
  • 695
3 votes
2 answers
94 views

what would the wind patterns on a world that has a constant "midnight sun" [duplicate]

I created a world that's axial tilt is on a constant 45 degree angle in the northern hemisphere it would look something like this. The problem is I can't figure out how the wind currents would work. ...
0 votes
1 answer
47 views

Can an earth-like planet exist in a circumbinary orbit around two k-class stars?While also having up to two dozen other planets in circumbinary orbit?

I have a plot arc in mind, but it all hinges on the feasibility of an earth-like world existing in circumbinary orbit around two k-class (or g-class) stars. The looming danger in the story arc is that ...
2 votes
2 answers
88 views

What color would a neptune like planet have around an orange dwarf?

Let's say we have a Neptune like planet orbiting around a k5v orange dwarf star. The planet is about as massive as Uranus but its atmosphere contains a large amount of methane. Based on what I have ...
2 votes
2 answers
112 views

How fast should my planet spin in order to be tidally locked?

I am designing a habitable planet with a diameter of 12.879 km. orbiting around a K5V orange dwarf star. Due to a number of planetery collisions during its creation, the planet ended up being tidally ...
1 vote
1 answer
109 views

How strong would a planetary magnetic field need to be in order to lighten the weight of ferromagnetic metals? [closed]

I am writing a fantasy/sci-fi where humans crash-land on a somewhat earthlike planet (continental distribution, great masses of water, similar element's abundance), however, I would like for one of ...
-1 votes
0 answers
35 views

My planet's atmosphere

The planet I am making is a super Earth,a celestial body slightly larger than Earth, but not big enough to be considered a gas or ice giant.> The atmosphere is the most important so here it is: ...
2 votes
2 answers
107 views

Would it be realistically possible for an Earth-like planet to have a "hidden" moon?

I essentially just want the moon to always be in shadow of its planet so that from the surface of the planet it cannot be seen at any time of day - might "appear" as a black orb that blocks ...
  • 105
0 votes
2 answers
34 views

What would the weather be like on an earth like planet the size of Jupiter? [closed]

Let’s get this out of the way: yes, I have considered the fact that there would be a massive gravity difference, but I have figured out a way around it. (It’s implausible in our reality, but works for ...
4 votes
2 answers
39 views

How to prevent the effects on gravity, climate and day-night cycles on a "planet" with a surface area nth time as big as earth's?

In my story, one key feature is that the earth-like planet or habitat has a surface area of earth > 10 times. However, as it is inhabited by pre-industrial humans that might have been brought on it ...
3 votes
3 answers
155 views

Could a planet much larger than earth have the same gravity if it were hollow?

Now- this is probably a stupid question but hear me out. If the planet I want to imagine were much larger than earth, would it have to have a massive difference in gravity? It sounds extremely ...
10 votes
1 answer
208 views

How large could an aerogel planet get?

Most of the world's lightest known materials are aerogels. In recent years, their mechanical strength has greatly improved, due to the creation of composites, crosslinked forms, and especially ...
  • 5,621
4 votes
1 answer
121 views

Could anyone give me a scientific explanation of how a planet/creatures would have purple-ish hue?

so this is related to a different planet/civilization me and my friend have in mind. The civilization is an intelligent life living far from earth, but what I have been thinking of is making the ...
  • 73
2 votes
1 answer
98 views

Would my solar system work out?

I've been building my own story world with my friend which revolves around humans and different intelligent beings, and for one of the beings, I've came up with a planet and a solar system that is ...
  • 73
8 votes
4 answers
760 views

Possible reasons for a planet/celestial body not tidally locked to have a region in constant darkness?

Trying to form a mostly logical basis for a world that would have one region always in darkness while also having a day-night cycle. My first thought was to ask if a planet could have an axial tilt ...
  • 105
11 votes
3 answers
1k views

What problems, if any, does a low density cause in a planet larger than Earth in mass and radius?

I'm worldbuilding for a sci-fi setting with some help from old Artifexian videos, and have made a planet that's suitable for human habitation. However, as this planet is larger than Earth, to make the ...
3 votes
0 answers
34 views

How to estimate the average surface temperature of a planet? [closed]

If given: Planet mass Planet radius Planet orbital distance (perihelion and aphelion) Planet albedo Planet atmospheric composition Planet atmospheric pressure Star mass Star luminosity Is there any ...
  • 31
3 votes
1 answer
90 views

How plausible is my alien world? Hot Jupiter system with habitable planet?

The theoretical world of Hēdran is the 2nd planet of a 7 planet system. It lies within its star's (G1.4) habitable zone, but with a hot jupiter gas giant only ~1 AU away it experiences heavy ...
-1 votes
2 answers
90 views

Would a solar flare hitting the earth cause rainfall? [closed]

If you have hydrogen gas, oxygen gas and heat together, it will trigger an (exotermic) reaction that produces water. Earths atmosphere consists of around 21% oxygen. Our sun is made mostly out of ...
10 votes
9 answers
5k views

Could an alien civilization discover electricity before fire, if their planet lacked significant oxygen but did hold common storms?

Let’s say there was an early alien civilization, not yet advanced. They hail from a planet with little to no oxygen. If this planet had electrical storms relatively frequently, could they harness the ...
  • 159
1 vote
1 answer
47 views

Could a substantial atmosphere protect a large moon from radiation belts like those seen in Jupiter's magnetosphere?

I'm imagining a moon with a mass of 0.25M (so 10 times larger than Ganymede), in Ganymede's position orbiting a gas giant like Jupiter. Maybe the atmosphere is anywhere from 0.1 - 1 bar. Would the ...
  • 695
17 votes
5 answers
3k views

Where could we add a new planet to the inner solar system?

Assume there was a super advanced alien race that for some reason, wanted to add a new planet, of lets say 1 Earth mass, into the Solar System. Where in the inner Solar System (The part of the solar ...
  • 1,020
5 votes
1 answer
83 views

Are there any atmospheric properties that might make iridescent clouds more common on a different planet?

I'm designing a few planets and the life that could inhabit them, and was wondering if an uncommon Earth phenomenon like iridescent clouds might be more common on a planet under different conditions. ...
  • 695
2 votes
2 answers
77 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 ...
2 votes
2 answers
182 views

What would make an atmosphere green?

I am making a space sci-fi film. And the planet that it takes place on the sky is green (like how ours is blue). The air can be toxic but it need to be able to explode if oxygen is introduced in to it....
7 votes
2 answers
957 views

On a planet with 99% humidity all of the time, how would human skin evolve?

This world has an incredibly high humidity rate all year round and I'm curious as to what - if any - evolutional changes might occur in human skin. Would it just be less porous or would there be a ...
2 votes
2 answers
177 views

On an alien planet, what kind of geological phenomenon can create a crystal mountains range?

Context: In my speculative evolution project, I've created a biome where the snowy tops of mountains have been replaced with crystals. The crystal should come from inside the planet, just like lava.
  • 622
2 votes
0 answers
68 views

Other types of planetary systems? [closed]

I recently watched Artifexian’s video about other planetary systems, and I’d like to know more about those types mentioned and if there are any additional types I should know about. (I’ve heard that ...
  • 21
3 votes
2 answers
98 views

A planet with huge rotation speed but also huge gravity?

Is it possible that a planet has a huge rotation speed and huge gravity so that at equator they mostly compensate for each other and the effective gravity is moderate (say, 1 g) but on poles the ...
  • 4,806
3 votes
1 answer
125 views

What would be the ideal conditions for a farm-world?

As title says, but for added context, here goes: The setting is a rather intricate take on hard-magic meets science-fiction, and takes place in a highly advanced milky way populated mostly by humans ...
  • 702
2 votes
2 answers
173 views

Saturnian Zeppelin Cities: can I use Aerographene coated with Titanium as the hull material to prevent getting crushed by atmospheric forces?

(After receiving countless suggestions from users like Sojourner, Wilik, and EngrStudent, I have come up with a solution to a cloud city on Saturn.) So, I ran a few calculations on Air Density ...
0 votes
2 answers
92 views

Help me create a more believable artificial planet

Ok, I noticed some very intelligent answers on this platform and I would love your input on the planet for my book trilogy. I have been working on the blueprint, story structure, and characters for ...
  • 9
0 votes
1 answer
47 views

Explaining My Planet’s Weather

Alright so my planet is very similar to Earth, but slightly more unstable. Both geologically and atmospherically speaking. It orbits an orange star, slightly larger and more “angry” than the sun. It ...
  • 5,263
6 votes
3 answers
785 views

What is a reasonable day length for a planet with 4 times earth radius?

The fictional planet has a mass of 18 times Earth's and four times earth's equatorial radiusreference. This gives it a gravitational acceleration of 11.02m/s^2 (1.29G) and an escape velocity of 23....
  • 13.8k
4 votes
1 answer
53 views

Planet Orbital Zone and Year Length

So I'm building a fantasy world that takes place on a planet with a circumference of about 18,500 miles (it's average temperature is 40℉), and it orbits a Blue-Giant. How long would a year be, and how ...
3 votes
4 answers
230 views

Day/Night on a Ringworld

In writing up an idea for living on a Ringworld, I've come to an odd question; Is there a moment of decreased exposure to the sun? I've seen this question asked previously, but people simply refuted ...
3 votes
1 answer
55 views

Acidic oceans on geologic timescales?

Lots of biochemical processes are sensitive to pH, and most (all?) organisms maintain close-to-neutral internal pH, except for specific localized excursions for specific purposes (like producing acids ...
3 votes
5 answers
930 views

Which Planets of my Galaxy Would Have the Most and Least Developed Economies? [closed]

While there are hundreds of thousands of planets in the galaxy my story is set in, only a handful of them are habitable, and over many millennia, each planet has more-or-less broadly coalesced around ...
4 votes
1 answer
375 views

How close the the star should i place my lava planet?

I am building a solar system with a k5v star at its center. Here are the some important stats for my star: Mass: 0.70 M Radius: 0.67 R Luminosity: 0.15 L Surface gravity (log g): 4.40cgs Temperature: ...
1 vote
1 answer
65 views

Tides on a planet with 5 moons? [duplicate]

What would be the effects on an earth-like planet with 5 moons, one the size of Earth's moon and the others approximately 1/10th its size? How massive would the tides be when they align?
  • 227
5 votes
7 answers
1k views

Is it possible to have a planet with only one plant, one animal and one bug?

The animal species on my planet has a highly sophisticated communication method and part of the reason for this is that they had no enemies on the planet except themselves. So far, the reason for this ...

1
2 3 4 5
45