Questions tagged [planets]

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

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Chance of a breathable atmosphere of any given planet in our galaxy

It is a common trope of science fiction that a space ship or shuttle crashes on a nearby planet, and for the human occupants to step outside and comfortably breath the planet's atmosphere. My question ...
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138 views

Why is this planet such a bad place to live? [closed]

Admiral Edwin Witt was obsessed with discovering a habitable world so future generations would remember his name. After decades of searching, he found a world that challenges the very definition of ...
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What would happen if the sun shrunk by 25% in 2000 years?

The big bad vilain is stealing energy from our sun. He has been doing this for 2000 years and the sun has already shrunk in mass by 25%. What are the effects on our earth. From what i found here and ...
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How do you map the climates and biomes on a tidally locked planet with no Coriolis Effect?

I've been looking through some videos and reading up on mapping out climates and biomes for fictional worlds very similar to Earth (Artifexian's videos have been a huge help), but I have been curious ...
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Appearance of an Ammonia World's Atmosphere

I started the process of making artwork for an Ammonia World and realized that despite all my previous research on their abiotic and biochemistry, there was one thing I never quite settled on; what ...
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1answer
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Could a planet about 30% larger than earth but only 80% as dense still support a strong magnetosphere?

I've been trying to work out a few calculations for a planet I am working on and hit a bit of a roadblock. The planet in it's current state is 1.35x the size of Earth, but in order to get a density ...
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A planet with toxic air

I just started thinking about a fictional universe where humans have colonized more or less any habitable planet (there is a huge concentration of habitable planets) and I'm trying to write down ...
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3answers
134 views

Could a “gentle” collision of a planet into another cause tidal locking and still support life later on? What other side effects could appear?

After a few years I seem to have come back to the topic of the possibility of tidal locking on a planet with life. I love speculative biology and designing these sorts of scenarios but tidal locking I'...
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Would this planet be habitable for intelligent lifeforms

I am trying to make a universe using math and this is a planet from the first solar system I am making. Firstly the star. This star, which I don't have a name for, has a mass of 1.3 solar masses, a ...
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Is there a way for a permanent Lunar eclipse, or another Object to always be in Earth's shadow?

I have a question regarding worldbuilding and haven't found a question like this yet, so I created an account and hope that someone can answer it :D As a starting point, imagine our real-life Sun, ...
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1answer
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Alternative biology/Xenoforming 3:any ideas how to xenoform Mars? [closed]

So i have an idea of an super advanced being that travels around the galaxy and spreads life on every planet that has any potential for it.By "life"i do not mean only "Carbon based"...
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1answer
127 views

Alternate Biology/Xenoforming:Could the moon have a Chlorine atmosphere?

So I have this idea that a super advanced being travels across the galaxy and is terraforming/xenoforming every planet that CAN be modified for life, not just Carbon based Earthlike lifeforms but ...
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Usefulness of launching probes to verify the existence of a hypothesized planet

In a parallel universe, humans have a 95% confidence that Planet 9 exists with the parameters given on Wikipedia. However, they have not directly observed it and plan on launching many space probes to ...
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2answers
255 views

How would intelligent life adapt on a black hole planet?

The world I'm building, Qi'raad, orbits a stellar-mass black hole. How would life best adapt to survive? Also, the black hole, named Halku, emits a relatively thin radio jet, which has carved a large ...
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1answer
111 views

Damarian's Parameters: What are they?

For Damarian, I have its system starting to be worked out, and I even have the basics of Checuti and how Damarian orbits around its mother planet. (Link to my first question about this system is ...
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1answer
99 views

How long should a Life-Harboring Mega-Moon's orbit around its Mother Planet be?

Damarian, the world I'm building, is the largest moon of its gas giant planet, Checuti. Damarian's diameter is 19,113 km, but its gravity is nearly the same as Earth's (It' largely made out of a ...
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1answer
184 views

How would the ocean smell if there were no life in it?

My characters are on a planet with no life that somehow has a weakly breathable atmosphere. They're on a beach and they note the smell. This is salt water so maybe the smell is different from, say, a ...
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1answer
86 views

How close to a star can be a tidally locked planet so to have moderate temperature on its dark side? [closed]

So, imagine an atmosphere-less planet, tidally locked to a sun-like star. How close to the star can the planet be before its dark side becomes too hot? I imagine that at some point the rocks on its ...
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1answer
125 views

What would the atmosphere of the Archaean Earth look like? (Before massive oxygenation)

I am designing an exoplanet in the Alpha Centauri system that is remarkably like ancient Earth before photosynthetic life developed and proliferated oxygen into the air. For Archaean Earth's ...
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1answer
105 views

Is a dense CO2 atmosphere compatible with an ocean

As part of an ongoing effort to update a planetary classification system for sci-fi settings, I'm trying to nail down if an old idea for an exotic type of life-bearing world is actually plausible and ...
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4answers
251 views

Would it be possible to have an earth-sized planet have much larger tides while remaining habitable?

I want a planet with roughly the same mass and volume of earth to have tides on a much larger scale than earth, enough that the coast would be extended for at least several hundred feet at low tide in ...
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Is a planet sized creature possible?

Now, I have started working on a game called In The Flesh, and I have decided to use this site to work on it. The Game Itself In any case, the main idea of In The Flesh is that it's a sci-fi ...
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Reef World 4 - Flora

Piggybacking on the previous “Reef World” questions. Let’s talk Flora and how it adds to life and the environment on Reef World. The entire planet is mostly covered in shallow ocean, but not ...
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4answers
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Reef World 3 - Wandering Islands on the oceans of Reef World

Piggybacking on "Massive volcano on reef world?" Pumice is a porous volcanic rock that while hard is friable (can crumble). What if my “Olympus Mons” equivalent volcano on Reef World created ...
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2answers
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If visible light from the sun stopped hitting the earth but the sun still existed, how would this affect the earth?

The sun produces light, heat, and other things. If the visible spectrum of light from the sun stopped hitting the earth but only the light directly from the sun, so moonlight and if heat can be ...
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1answer
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What would it look like if an artificial atmosphere began to disappear?

In my SciFi-Magic RPG campaign, the main characters are on Mars, which has been converted to a prison planet. A large device, drilled into the north and south poles, reaching into the core, heating ...
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1answer
92 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 ...
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What are the atmospheric/planetary effects of having no solar wind?

Suppose we have an earthlike world orbiting an artificial star which produces light but no solar wind. I would like to understand the implications that a lack of solar wind would have for the planet. (...
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567 views

How can I give my habitable planet argon in its atmosphere?

I want my planet's atmosphere to have roughly 10% argon so that its inhabitants can easily use it to color their lights purple. But I'm not sure how to explain the cause of this high argon content. ...
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Placing a planet on the famous Escape Velocity Graph

If I'm understanding the chart correctly, in order for a planet with lower gravity than Earth (smaller than Earth), but with decent magnetosphere, to hold on to an atmosphere with oxygen, and water on ...
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2answers
364 views

Massive volcano on reef world?

Piggybacking on my previous question: Possible reef world? An answer in that question included that reef world is an "old, old world. (So)The core has frozen and plate tectonics have stopped...&...
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Probability of a spaceship stumbling upon a random planet?

In an intergalactic federation, space ships are extremely common. They run supply routes, defend planetary bases, and transport colonists to new worlds. To aid in these adventures, most ships would ...
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Is This Desert Planet Realistic?

Okay, I have a desert planet that orbits an M0 star and an G0 star at an circumbinary orbital radius of .9 AU from the shared center of gravity of its twin suns. It’s tilted on its axis by 23.5 ...
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1answer
77 views

Predict The Orbital Eccentricity Of A Planet In A Circumbinary Orbit

Okay, I have a planet smaller than Earth that has a mean orbital radius of .9 AU, and it orbits twin suns. The larger sun has a mass of 1.15 solar masses, and the smaller sun has an mass of .45 solar ...
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6answers
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Possible reef world?

Piggybacking off this question: Shallow sea world - plausable geology? what would we need to have a world covered in reef? An entire world of this: If I understood them correctly the previous ...
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6answers
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How do I stop my near future city state from flying past a certain height and distance or sending up sats, but keep radio communications intact [closed]

A near future large city state is surrounded by a far more massive forest that is semi sentient. How do I stop them from sending up satellites, or sending up weather balloons high enough so that they ...
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3answers
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Telepathic octopi influencing other species [closed]

Let's imagine humans are somehow controlled by a smart telepathic species that make themselves invisible to them, say everyone has an octopi on their head and are unaware of it. Every time the ...
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Reasons for insanely huge precious metal deposits?

In my book series, there is this extremely rich Earthlike planet called Aurea whose claim to fame is supplying the vast majority of the galaxy’s precious metals (gold and silver for the purposes of ...
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1answer
126 views

What substance would make a good lava ocean?

I'm starting work on some fictional star systems, and I want to create a planet that has lava oceans. I found an excel spreadsheet a while back that does calculations for stars and planets, and based ...
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2answers
148 views

Is This Living Planet Plausible?

My idea is an planet that is one living organism wrapped all around an rocky foundation. It orbits an sun of one solar mass, and has an Earthlike radius. Its albedo is about 20%, so it gets 1098.4 W/m^...
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1answer
49 views

Rotating ice lake of high molar hydrochloric acid

Say I have a rocky airless world with size and density to produce two gees orbiting around an old dim star. Could I have a round(ish) lake with a high molar hydrochloric acid ice? It could be ...
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1answer
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How Small Can a Planet be with 1G Gravity and Tectonics?

Without resorting to solid osmium inner cores that we couldn't give an origin story for, what's a cosmologically plausible lower bound of a planet's radius that also maintains 1G gravity and the sort ...
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What color can the sky be, and yet still be a human-breathable atmosphere? [duplicate]

With a star similar to our own Sol, what other gas or gases could replace Nitrogen, while allowing O2 to mix properly, yet have say, a sky that was green or red? Sulfurhexaflouride is out as it is too ...
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1answer
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Climate of a Planet in a Binary Star System

Would the climate of a planet in a binary star system consisting of a K star and a G star be affected by the binary system? By this I mean, does having two stars at the center of a solar system affect ...
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3answers
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How would the reflection of sunlight change the day / night cycle of a binary planet system?

I am thinking of setting a story in a binary planet system, but am unsure what mechanics would be at play in regards to the reflection of light off of one planet and the day/night cycle. In this story,...
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2answers
165 views

Is it plausible for a planet to have a face constantly sunlit while the other is constantly moonlit, with the sun/moonlit territories never changing?

I'm writing a sci-fi & fantasy novel, I won't get into details, but in essence it's set on a fantasy planet that orbits around a sun, and has a moon. The basic premise (that I'm hoping for anyway) ...
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1answer
146 views

Changes to water worlds to make them habitable

What changes/additions/deletions, large or small, minimum handwavium allowed, would be needed to make suspected water covered exo-planets such as Gliese 1214 b, Kepler-22b, Kepler-62e, and Kepler-62f, ...
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5answers
110 views

Could a planet form from the remnants of a star and its solar system?

This is just a simple question, and I haven't thought all that well on it, but I think in terms of sci-fi and fantasy less tied to probable scenarios this could be quite possible. Imagine a free-...
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1answer
174 views

Can a planet hypothetically have two atmospheres with an ocean in between?

I want my hypothetical planet to have a sort of ocean to filter out radiation, but density is problematic. There would have to be an outer atmosphere, and then some form of ocean-like liquid that is ...
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1answer
122 views

Oceans of breathable liquid

I want to create a locale (hopefully a whole planet?), where the ocean is breathable. I was looking at perfluorocarbons, so the liquid part is at least possible(?) Is there any way to create a world ...

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