Questions tagged [planets]

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

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4
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5answers
140 views

Is a rainforest (or any single-biome) planet feasible

Various sci-fi movies often have single-biome planets (such as Tatooine, for example). Obviously a desert planet is possible (witness: Mars), but what about a more complex ecosystem, such as a ...
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3answers
178 views

Could you detect extrasolar intelligence using a non radio-telescope or other instrument?

The James Webb Space Telescope, after decades of development, has finally launched. It stands to reveal great knowledge about the dawn of the universe, and great insights into extrasolar planets. With ...
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1answer
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Darkness on a hycean world

Hycean worlds are planets twice as big as earth and covered in water oceans and with atmosphere full of hydrogen. A dark hycean world is one such world tidally locked to a star with one side forever ...
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1answer
40 views

In this binary, how far would the secondary planet orbit the primary planet and still have its own day-night spin?

A scenario I've been exploring lately: Orbiting a binary of G0 stars (each one 105% as wide, 110% as massive and 126% as bright as our sun) from a distance of 2.065 AUs is a planetary binary. The ...
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2answers
52 views

Life present on earth-like habitable exo-planet

Scientists are looking for an earth-like habitable exo planet. If an exo planet is earth-like (in terms of gravity, atmosphere, light, water etc.), then it must have gone through an evolution process (...
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Endless global night.. but an agreeable climate, how come?

How would my planet develop an acceptable climate, without a sun ? There is no (visible) sun, but the climate permits STP, and there are 1 or more luminous, rocky moons providing some light. Perhaps ...
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3answers
97 views

Can two planets orbit a star in a binary fashion?

There are several questions similar to the one I'm asking, but I'm not sure this fits exactly with them. Basically, I have two habitable planets, for the sake of this, let's just assume they are ...
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2answers
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How would it feel to sense a magnetic field reversal of one's planet?

The idea is for my story to begin at the end of a magnetic field reversal of the planet where it takes place. Certain characters have the ability to sense the direction of the magnetic field, not ...
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Are there things that can make natural lifespan in other planets inherently longer?

How would things like gravity, air composition and density affect the lifespan of the biological protein based life that inhabits the planet, or would they have any significant effect at all? Honestly ...
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4answers
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How un-dense could a super-duper-Earth be if that super-duper Earth was bigger than Neptune?

Long story short, I have an Earth-like planet, which is orbiting a mega-Earth (think a super-duper-sized version of a super-Earth), which is orbiting a K-type star, which is orbiting UY Scuti. I want ...
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30answers
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Plausible natural reason why you can land on a earthlike planet yet can never get back to orbit from it?

Imagine a future where humanity has reached the stars, an exploration party lands on a earth like planet that's liveable (doesn't have to be perfect but life on it is on the range of what most people ...
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Living around a quark star

Let's assume the theoretical quark star exists — and humans have found it. There's a planet orbiting it, and for the purposes of my story, I want it to be habitable. My question is: Can you have a ...
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1answer
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Given the parameters of this planetary system, what would the practical effects be on its surface?

I have a planetary system consisting of an oceanic world [7% Land] with a large precious metal moon [extremely dense with valuable alloys]. The planet has 110% earth mass, with a size of 1.4 Earth ...
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What are the implications of this given planetary situation?

My planetary set up is a single planet with 110% Earth density, and a planetary radius of 1.4 Earths. It is a continental world composed of 89% Liquid water oceans, stretching up to 13 km at the ...
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8answers
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Can an ocean and beach only planet exist with an O2 breathable atmosphere?

I'm creating a planet, and I want it to be: A windy place, with ocean everywhere (like the earth) The same pressure & composition at sea level (like the earth) Only one biome: A beach. The entire ...
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1answer
32 views

How can a planet's seasons be only controlled by either its land, sky or water?

I have a planet established (similar to Earth) which instead of countries has 3 main zones of habitation: land, water & sky. Each supernatural inhabitant looks after one natural part of this ...
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2answers
557 views

Methane-Breathing Animal?

In my story, Saturn’s moon Titan’s methane lakes are inhabited by microorganisms that photosynthesize, converting hydrogen into methane (A process thought possible on Titan after some study). This ...
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3answers
147 views

what alternative topological shapes could alien life take on?

I've always been intrigued by the idea that alien life would be completely different from life on this planet. recently, I've been doing some research and found out that humans, along with other ...
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2answers
117 views

Pop-up islands on an outrageous ocean planet!

This is a question for geology people... Imagine an exoplanet with a thin crust, intense tectonic activity, but with weak, fragmented crust plates that buckle and sink as well as subduct beneath each ...
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0answers
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Electricity-powered life on an ice planet?

I imagine that in a nearly Earth-sized ice planet with an atmosphere similar to that of earth, life has been able to proliferate. It first formed in the oceans below the ice, which are warm enough for ...
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1answer
107 views

Altered Earth Physics

I was researching whether Dragons in Game of Thrones are realistic or not and I found a answer in Quora very interesting about them. In it, the guy said that for a world to be habitable for such large ...
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3answers
838 views

Evolving animals without an ocean

Rust and Cannonball are two very different worlds in most ways, with very different chemical environments and very different types of life*--but they have one important feature in common: they have no ...
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4answers
839 views

Help in determining the features of a fictional planet

I'm writing a sci-fi novel about a planet outside of the Solar System. The planet can support human life and is similar to Earth in many ways (1G gravity, Nitrogen-Oxygen-Carbon atmosphere, soil and ...
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1answer
157 views

An ocean of mud?

The Transgalactic Guide to Solar System M-17 by Jeff Rovin features, among others, the planet Morana, which is described as having oceans of "mud". Obviously, this cannot be normal mud such ...
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2answers
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What would be the effects on climate on a Venus sized planet orbiting a K0V star in a similar manner to Mars?

The planet has the characteristics of Venus in terms of mass (0.815 Earths), density (5.243g/cm3), surface area (0.902 Earths) and gravity (8.87m/s). It has an Earth-like atmosphere,water covers about ...
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1answer
88 views

Two celestial bodies tidal locked - not with the sun

I tried to do my homework and actually thanks to this question and answer, I found myself to this site. But I just found more questions :) Basically the setting would be close to what Earth - Moon is, ...
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How would this atmosphere change the way weather works and therefor biomes

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
132 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
131 views

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
200 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
183 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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1answer
122 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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7answers
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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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3answers
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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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4answers
2k views

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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1answer
249 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
108 views

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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3answers
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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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2answers
329 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
124 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
120 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
318 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
470 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
80 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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1answer
151 views

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
532 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
54 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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