Questions tagged [planets]

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

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Geology and climate on a habitable moon

A bit of background: I'm in the beginning stages of creating a habitable moon orbiting a gas giant. The conditions I have so far for this are: The moon itself is more or less Earth-size, and the gas ...
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Is 50% CO2, 50% H2O ocean possible? If not possible, what other proportions are OK?

Can a planet have its whole surface covered with a 50% carbon dioxide and 50% water ocean (the substances being diluted in each other)?
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Feasibility of Liquid Water at Bottom of Valles Marieneris [migrated]

Last night I was looking at NASA's equations for pressure and temperature of the atmosphere of Mars. P (in kiloPascals) = $0.699 \exp^{-0.00009 h}$ The Valles Marineris is 11 kilometers deep at it's ...
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Would an asteroid colliding with a terrestrial planet result in the creation of extensive caves nearby the crater?

I just did some research on the Chicxulub crater in the Yucatán Peninsula in Mexico, which is the crater from the asteroid responsible for the extinction of the dinosaurs. Yucatán itself does have ...
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Maximum shell world planet size with earth-like conditions

I am trying to work out the theoretical limits on the size of a shell world (made with orbital rings constructed around a black hole). I have the following constraints: The light to the planet must ...
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Habitable Mercury [closed]

I am writing a science meets magic setting where civiliation exists on Mercury. I am wondering what kind of biomes you think would be present on a Mercury where magic can influence the environment? I ...
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Can a fast planetary rotation create a planet with an equatorial continent, preferably with very high mountains and two polar oceans?

I’m trying to create a planet with two small polar oceans with equatorial supercontinent in the middle. The land is in turn divided in two by high mountains that act as barrier and a source of water ...
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Why is Mercury's Density So Low? [migrated]

I know the title sounds odd. You might be thinking "Doesn't Mercury have the highest uncompressed density of any terrestrial planet? Much higher than a planet its size normally should have?&...
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How can a planet have relatively common lethal hailstones?

Sometimes hailstones reach sizes that are deadly to large animals and people and livestock have been killed. This is a relatively rare occurrence on Earth of course. If I want a planet where lethal ...
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Can a super-Earth of Approximately 1.5 Earth-Radius and 3.0 Earth-Mass Be Habitable?

Can a super-Earth of approximately 1.5 Earth-radius and 3.0 Earth-mass be habitable? By habitable, I mean terrestrial with liquid water on its surface, a rocky ocean floor, and no thick hydrogen/...
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What are reasonable densities for terrestrial planets?

Earth's density is about 5.51 g/cm^3 and it's the highest density in the Solar System of a terrestrial planet. I understand that planet density is partially determined by various factors, including ...
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Is my planet possible?

I imagined a hypothetical planet named after Bacchus (the Roman god of wine, ecstasy, parties, theatre, drama, comedy, tragedy, and spiritual madness). Its main characteristic is an ocean composed of ...
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Twin worlds governed by nitrogen

https://www.space.com/amp/we-dont-understand-exoplanet-habitable-zones In the link above is an article about how atmospheric nitrogen could affect habitability of a planet. Examples given are a wet ...
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How to Cause a Hydrosphere Apocalypse Part II The Great Flood

This is part two of a two part question. You can find part one here.(How to Cause a Hydrosphere Apocalypse Part I The Great Drought) One of the more interesting movies I watched growing up was ...
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Mars sized planet with 83% Earth gravity?

For one of my stories I’ve developed a planet with approximately the same total surface area as Mars. This planet has high quantities of heavier metals/elements (especially silver) and it has roughly ...
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How big does a planet have to be to appear flat for human sized observer?

Alternatively what eye properties can be modified to give the feeling of living on a flat, but infinite plane rather than being on a really tiny planet? Edit (16 hours after posting): Thank you for ...
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How to Cause a Hydrosphere Apocalypse Part I The Great Drought

This is part one of a two part question. Part two can be found her (How to Cause a Hydrosphere Apocalypse Part II The Great Flood) Desert planets are a staple of science fiction. And while we have ...
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What physical conditions should be present on a planet for humanoid bird-creatures to exist? [closed]

I'm writing a fantasy novel with a sentient human-bird species. These creatures magically transform, growing feathers etc. becoming essentially giant birds. What would the general conditions on this ...
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How to calculate the greenhouse effect?

I tried many equations (Stefan-Boltzmann constant) that gave me a temperature of 249.769 Kelvin (-23.38°C) assuming no atmosphere and 297 Kelvin (24°C) with perfectly absorbing one, but my planet is ...
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Different Environment of Amoebic Sea

I want to work with my own amoebic sea like on Darwin iv in the mockumentary Alien Planet. But I wonder if it would be the same throughout. Would the parts near the poles be frozen? Would shallow ...
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How would different factors increase the speed of tectonic plate movement

The movement of the tectonic plates in the Earth's crust is quite a small amount, at only a few centimetres a year. How fast could the movements of a tectonic plate get up to if an earth-like planet: ...
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Could a planet's tidal forces break an asteroid passing very close to it?

I want a certain asteroid of my system to break into pieces as it approaches a planet, having one fragment impact the planet itself, another fragment slingshot and impact the planet's moon and the ...
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Is an atmosphere that it's not breathable but won't damage the skin on a tidally locked Ocean planet plausible? [closed]

In my story, people are trying to colonize an Ocean planet that orbit Ultra-cool red dwarf. (Based on this Wikipedia article a planet can retain Water in this type of stars with a mass around 0.08-0....
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Can any manmade vessels float on ocean of liquid nitrogen?

Humanity is finally reaching the interstellar space and had discovered a terrestrial planet covered in liquid nitrogen, the planet is orbiting a star thrice as massive as Sun but is too further away ...
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What would an until-recently waterworld look like?

So, suppose a world that, for most of its biological history, was a water world, with minimal dry land. Starting from the Cambrian Explosion analogue, the world stays like this for roughly 460 million ...
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How to remove Saturn’s rings?

So oblate spheroid man is mad. One of his oblate spheroids has these nasty rings on it and he cannot watch it rotate in peace. So he dispatches Mr. Skeeble to get rid of them. Mr. Skeeble gets to ...
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Could Uranus have a solid surface due to its internal composition and lack of internal heat?

Uranus is the seventh planet from the Sun. It is classified as an Ice Giant, which, unlike a Gas Giant, such as Jupiter or Saturn, is composed mainly of elements heavier than Hydrogen or Helium. ...
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Does my planet's climate check out? [closed]

So as part of a worldbuilding project I've decided to write up basic specs for a fictional habitable planet and draw a map of its continents and climate, but my main concern is that I haven't quite ...
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Could a habitable gas giant with an electropshere exist?

So, there are several questions on this site about gas giants. In particular, I am mostly building off of this one: Could a gas giant with layer similar to Earth atmosphere exist? This question seems ...
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How do I Cram Many Different Biomes Into a Very Small Landmass?

In my book series, there is a planet called Ryu 108 that is almost entirely a water world. It is the furthest planet from its star (a supergiant), and has a relatively cold-but-still-habitable climate ...
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What would be the longest possible tree?

Note that I ask about the longest possible tree and not the tallest possible tree. There have been a number of questions about the tallest possible tree, and I wrote a detailed answer to one: https://...
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Atmospheric properties of a heavier Earth-like planet

I am trying to figure out ways to determine the density and composition of an Earth-like planet. For the sake of the "experiment", let's assume that the planet is identical to Earth in every ...
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What is the minimum size of an habitable planet to have two moons?

For the sake of the question, let's define a moon as a natural satellite at least half the size of our Moon. It needs to be spherical like our Moon, not like Phobos and Deimos on Mars. The imaginary ...
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Can a planet dream of sheep?

I had a peculiar dream... There is a terrestrial planet orbiting an unknown multi stars system, that planet in fact is alive as in its a living planet. Just like the Portuguese man of war it is ...
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Making a world as Agriculturally productive as possible

Basically, God decided to create the perfect world for man to work the land. Even then, he voluntarily decided to follow the laws of physics. I've investigated about some factors that supposedly ...
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Feedback/help on planetary density?

I’m at a bit of a wall here. I have numbers for mass, radius, and gravity for my planet (Neogaea), but the density is escaping me. Mass: 1.31 earth masses Radius: 1.027 earth radius Gravity: 1.25 ...
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Tidal Effect of Twin Moons

In order to account for an immense amount of technological and cultural disparity, I have been attempting to figure out ways that the world in a setting could be extremely hostile to travel. The idea ...
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Amoebic Sea and a civilization [closed]

Let's say you had a planet like Darwin IV with a sea like the amoebic sea. How would that affect a civilization that evolved on the planet? All I have so far is they might worship it as a god, they ...
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Reasonable atmosphere for an Earth-like planet orbiting a K dwarf star (including abiotic oxygen)

I would like for my planet to be close to Earth’s size (so similar gravity), with much of the surface covered by water, containing atmospheric oxygen from abiotic processes (the photocatalytic ...
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What should an inactive planet's topology be for nutrient circulation?

I'm trying to engineer an Earth mass planet built initially out of pure silicon dioxide (silica). So basically, imagine a glass sphere slightly larger than Earth somewhere in the Goldilocks zone, ...
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Can a planet have asymmetrical weather seasons? Like 3 months for summer, fall and spring each and 6 months of winter?

I looked around for an answer and was unable to find it here. So can the planet have asymmetrical seasons? I want my imaginary planet to have winter doubled comparing to summer. And which astronomical ...
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Two Worlds tethered together - how would the forces affect people on the planets?

^ Not to scale Assumptions These worlds are engineered. So some aspects of the worlds can be manipulated. Equal Earth-sized planets. Tether attaching them is infinitely strong. Their separation is ...
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What could cause the formation of canyons and river pattern in a atmosphereless moon?

So I've made this moon with a texture from Google earth, https://www.google.com/maps/place/Tassili+n'Ajjer/@26.2042919,7.0063722,457055m/data=!3m1!1e3!4m5!3m4!1s0x12306aaaaaaaaaa7:0xa1414e994aabc4b6!...
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At what speed does a diskworld need to be spun to counteract horizontal gravity?

I am trying to build a disk world and trying to find out how fast it needs to spin to counteract the horizontal component of the gravitational field. I dont know how the gravitational field varies ...
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Giving planets quirks - How can I make the planets in my solar system interesting, even if they're relatively normal? [closed]

My question is simple: what are ways that I can give planets their own unique features without going too crazy? So far, I've created 3 planets: one that has crazy volcanic activity, one that is ...
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What (if anything) can cause a substantial and stable shift of the magnetic poles of a habitable planet away from its geographical ones?

Most planets have magnetic poles that align pretty well with their geographical ones. On earth, for example, the magnetic dipole field is tilted about 11 degrees from the rotational axis. As far as I ...
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Is there any scientific way a ship could fall off the edge of the world? [closed]

I'm trying to write a story about falling off the edge of he earth during a sea voyage and would like to incorporate as much as detailed and accurate physics as possible. For this to work, I know ...
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Can a carbon planet form within a silicate-based planetary system?

Can a carbon-rich planet form in a solar system where all the other planets have a lower carbon-to-oxygen ratio (like Earth has silicates and oxides, or oxygen and silica)? (Let’s say the planet ...
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How high could a super-mountain get on a lower gravity planet (0.7g)? [duplicate]

I’m thinking of a world with one extremely high mountain that would factor prominently into the mythology of the civilizations. I’ve heard that it’s estimated that 10,000 meters is about as high as a ...
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Age of sail navigation tools for a planet with a ring

Alright so I have a planet where the locals are about seventeenth century level of technology, meaning sailing ships and single shot black powder weapons are the standard and there is plenty of ocean ...

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