Questions tagged [planets]

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

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0answers
29 views

Jungle planet characteristics

Is it possible to have a mostly jungle and swamp like planet with these characteristics: The planet is a mostly water with high amounts of oxygen much like the Carboniferous period on earth. 2 suns ...
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1answer
117 views

Can a moon be asymmetric?

I'm writing a story related to 'symmetry' and would like to detonate an asymmetric moon. Would gravity allow this? Could a moon be any other shape but round?
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1answer
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How could a human with infinite strength crash a planet into earth

A bad guy was kicked off earth and lands on another planet or dwarf planet. He has magical powers that let him have as much physical power as he needs to accomplish his goals. He is also extremely ...
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2answers
186 views

What could cause a planet to have hemispheres that rotate in opposite directions?

I have a planet in mind that is highly hostile to basically everything around its equator but is more or less survivable everywhere else(hopefully ^v^). One of the ideas I have in mind for making the ...
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5answers
164 views

How might be the protocol to determine if an exoplanet is safe to colonize

Let's make some assumptions: current tech. we're able to send manned missions to this exoplanet thanks to a sci-fi element (a portal for instance); I just want to obviate that we have no way of ...
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What would a planet with outstanding ugliness look like [closed]

I'm playing a phone game called seedship and one of the planets traits is outstanding ugliness. this doesn't make sense to me. all planets are beautiful. show me a picture and prove me wrong.
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1answer
107 views

Can there be an ocean in a CO2 atmosphere?

See my first question here and other things about atmosphere: What would be the color of a CO2 atmosphere? Hi so I have a planet with a CO2 atmosphere so can there be any ocean on this planet?
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1answer
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How far away would you need to be to survive a jet of stellar plasma on the surface of a "planet" built around a sun?

So, I'm considering writing a story, and one of the settings is a world created by a powerful wizard millions of years ago, by opening a thousand portals to gate in a thousand Earth-like worlds that ...
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Could Mars be punched onto a collision course with Earth?

In a fantasy world I am making someone insanely powerful is knocked into space and lands on Mars. He can't just jump back because there are people who can push him off course and he would be going ...
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How Do I Make Trappist-1g Habitable (in a fantasy setting)

This question is not about terraforming! (or atleast not technological terraforming) I am writing a fantasy story set in the (real) Trappist-1 system. I am trying to faithfully keep most of the ...
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How would an osmium core affect life on a planet?

I seek to have one of the setting's worlds be smaller than earth but is also conveniently earth-like in its gravity, 1g at the surface. A possible solution to this has been to have its core be made of ...
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4answers
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Is an almost entirely water-based planet stable enough to stay as a planet for long enough for complex life to form?

Imagine an earth mass that consists purely and entirely of water that orbits a star similar to ours at a similar orbital distance to Mars(or whatever distance would be sufficient for the planet to ...
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237 views

How big can a whirligig/planetcake get while still maintaining human-survivable gravity at its equator?

A whirligig/planetcake/whatever punny name you want for it is a super-sized planet (we're talking about Jupiter masses here, not Earth masses) that spins so quickly that it's shaped like a pancake (...
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2answers
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What is the maximum percentage of sky that could be covered by a super-Jovian world?

Puffy Jupiters can be huge but the Kepler data suggests that traditional super-Jovian worlds nearer the goldilocks zone, or farther from their parent star, only reach about 10% larger in diameter than ...
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81 views

Hours of sunlight calculation

TL;DR - How can I calculate the hours of sunlight a spot on a planet gets when I know its location, time of year, and altitude? How would having objects in the way affect these values? I am currently ...
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3answers
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What's the darkest/lowest albedo rock that can predominate a planet's surface?

Earth has a bond albedo of 0.3, Mars (presumably because of fewer clouds) is 0.25, and the moon comes in at 0.12 (which is darker than it seems from Earth). Water has a very low albedo, but clouds ...
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263 views

How close could a creature longer than Jupiter get to Earth without destroying it?

So basic introduction: my world has things which naturally should never exist due to seemingly violating certain laws we deem as natural, for this, let's just call them "anomalies". Among ...
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3answers
116 views

Would life be possible on a planet whose poles each directly face the sun once a year?

There is a kind of planet that I'm curious about regarding its habitability. Basically it's a planet that's very earth-like as far as its mass and material and atmospheric content and rotational/...
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1answer
76 views

How far away must a tidally-locked planet be from its star for the side facing the star to be lush?

I've been wondering if it's at all possible for a habitable tidally locked planet to not be a scorched wasteland on one side, an oasis in the twilight, and a frozen wasteland on the other, the planet ...
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2answers
258 views

What is the largest achievable oxygen-atmosphere world?

I am trying to calculate the largest world that will meet the following criteria: Exists within the Goldilocks zone of a G2V star similar to our sun. Is survivable long-term by anatomically modern ...
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3answers
445 views

What kind of planet would the materials of a decomposing god's body lead to if it were made up similarly to a human's body?

I'm envisioning a universe where the dead gods are what make up the galaxy's stars and planets and even the black hole at the center would be a particularly huge one that managed to get itself killed ...
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2answers
71 views

Weather in a desert planet

Neviat, it is a desert planet with 81.5% of the Earth's atmospheric pressure and 80% of its gravity, it is generally dry but has many lakes and oases at its poles, the temperature across the latitudes ...
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Orbit resonance: Is it possible to have exactly 3 months in a year?

It is possible for a planet to have orbital resonance with a sun (e.g. Mercury has a 3:2 spin resonance with the sun). It is also possible for a moon to have orbital resonance with a planet (e.g. our ...
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3answers
524 views

Is it possible to have four moon on different orbital elevations?

Could a planet that is twice the volume of the earth, have four moons but each orbital path is at a different angle? Eg: M1 has a max elevation of 10’N and a min of 10’S M2 has a max elevation of 17’N ...
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1answer
48 views

Does this world sound realistic? (more tectonic activity)

Essentially, I want some characteristics for my world, and I want to have some amount of realism, so that I can use that realism to guide my writing. My world, Treyidal, is an about earth sized planet,...
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4answers
130 views

What Could Create the Remaining Two Types of Single-Biome Planets?

There have been numerous questions in this SE about single-biome planets popularized in the Star Wars mythos. Despite the criticisms, these worlds are plausible, and they all involve the right ...
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1answer
101 views

What would the Climate effects of a Circum-Equatorial current be on a world with 0 degrees of axial tilt

The basics of my worlds oceanography is that there is one large ocean that covers one side of the world completely, and in-between the northern and southern continents on the other side of the world, ...
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3answers
91 views

can a planet be in the habitable zone of a blue star be the best option or a star that gives off more blue light

My planet originally was in a system with a blue star, but I think they are unstable and so it's not the best. So what type of stars give off more blue light in order for plants to be yellow or blue. ...
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1answer
72 views

Are there any big showstoppers for this cold planet having a large ecosystem?

I have a question: what is the best way to get a outer habitable zone planet to have liquid water on its surface (and a complex biosphere) without having lethal amounts of CO2 or greenhouse gases in ...
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4answers
621 views

Too much oxygen and not enough carbon

If a planet has a lot of oxygen to support mega flora and fauna, how much would be too much? My planet has the oxygen content about that of the carboniferous(as a starter example), which had a about ...
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4answers
212 views

Can a pangea like continent have diverse life and climates?

In my story, a group of scientific explorers go on a expedition to a planet, and I don't know if it should be a super continent because of the diverse life there could be. There are deserts, forest, ...
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1answer
78 views

Could a slow rotating planet be protected by another's body magnetosphere?

I'm working on a slow spinning planet whose rotation period lasts around 24 Earth-years (about 8766 days). It would be a rocky planet similar to the Earth in size and mass orbiting a K- or G-type star ...
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How to have humans evolve the same on multiple planets

How to have humans evolve the same on multiple planets In my fantasy universe, almost all sentient life, and most non-sentient life including humans, was teleported to hundreds of planets after a ...
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2answers
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how do plants evolve to eat creatures

I have a idea for a plant on my world Chlorea. It is inspired by Venus fly traps and the plant that smells like rotten meat that attract bugs, but I want to know why and how did they evolve this way ...
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Can a plant or alien plant have fruit and shoot seeds as well?

On my planet Chlorea there are desserts and in them is a tree-like plant. During the dry season nothing really happens; the plant saves water, they lose leaves to save water etc. But in the wet season ...
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1answer
92 views

How would Blue or Yellow colored plants change during different weather seasons

My planet basically revolves around a blue star or a star that gives off more blue wavelenghts and the color of the plants are either blue or yellow or both because of it. Now, how would the color ...
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103 views

How Would it Affect the Galactic Economy if One Planet Controlled 99%+ of the Galaxy's Gold and Silver? [closed]

The Planet Aurea has by far the most gold and silver out of any planet of the entire galaxy (thanks to two mountain ranges it has, one around the size of the US portion of the Rocky Mountains made ...
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Largest possible biomass on any given exoplanet

Suppose you are the hypothetical architect of a new exoplanet, who's been handed the job to maximize this exoplanet's biomass. Given the current knowledge of life as it is, and thus leaving any sort ...
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1answer
109 views

How large would Alpha Centauri AB be in the sky, when observed from exoplanet Proxima C?

Context: I am creating a hard science-fiction world set in the Alpha Centauri system. How large and bright would the binary star Alpha Centauri AB in the sky, when observed from an exoplanet (Proxima ...
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2answers
392 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 ...
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1answer
63 views

Convection Cells in the Atmosphere of a Jupiter-Sized Planet

Background The setting for a story I am creating is an earth-like planet near jovian surface area, existing in a universe where the force of gravity is appreciably weaker than in our own, such that a ...
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1answer
132 views

How "geologically Earth-like" can my large terrestrial planet get?

So I've ran into a bit of an issue. Not knowing much about geology, I thought that I could get away with making a planet with 150% Earth radius with it still having a geology identical to that of ...
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3answers
162 views

Life on the planet of an F-type star

What will vegetation, weather and sea colour be like on a planet of an F type star? Assuming that the conditions are similar to Earth. (Enough ozone layer etc) The intelligent beings travelled there ...
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4answers
233 views

A Planet Approaching being a tidally locked planet

I am world-building an adventure for the Alien RPG. As a world approaches being tidally locked, and by this, I mean in the process of slowing down, but not stable. In such a world that no longer ...
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1answer
99 views

More Moons = Brighter Nights?

Now, firstly, I understand that the moon reflects a portion of sunlight onto the night's surface; So if a planet had multiple moons--say two or three, how would the additional celestial mirrors affect ...
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4answers
122 views

Can there be a moon of a planet where there is always day even if it is rotating on its axis

Is it possible to have a moon of a planet that is practically day on both the star facing side and the other side, if the planet itself is mostly made of highly reflective surfaces like Silver and ...
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1answer
107 views

Would gravity be stronger or weaker on different sides of a dual planet?

If you had two similar sized planets that were tidally locked to each other, would gravity change depending on whether you were closer to the sister-world? Assuming they were quite close.
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979 views

Double planet climate

How far would 2 tidally-locked (to eachother) planets need to be from their blue star host to be habitable, but have a cold-weather climate similar to our Ice Age?
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119 views

How big of a problem would UV radiation be for colonists around a main sequence blue star?

I've settled on using a blue star for my setting. It'll probably either be a small B or large A-type main sequence star, somewhere between 2 and 4 solar masses. There is one relevant planet. I've ...
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1answer
59 views

Plausibility of Low-Pressure Breathable Atmospheres?

My question is inspired by the fact that in the computer game Elite:Dangerous, the player's spacecraft is capable of landing on planets with "tenuous" atmospheres, measured as being 0.1 ...

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