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Questions tagged [planets]

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

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1answer
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Plausibility of “diamond”-like crystal and/or mineral substances forming on a planet orbiting a dwarf star

Alright, so the primary inspiration for this is 55 Cancri e, the speculated carbon "diamond world" and to a degree, Nkllon, a planet in Star Wars that is essentially what Cancri is, but "confirmed" to ...
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3answers
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Plausability of Purple Oceans

Alright, so I've been meaning to write out a planet with golden/yellow fields and a violet / purple ocean. What I was thinking about is having the water of this world is so clean and nourishing that ...
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3answers
79 views

Object in the orbit or orbiting Uranus's moon Puck

I realize the response to this question is fairly involved but here goes. I need to have an alien spacecraft either in orbit around Uranus's moon Puck or somewhere in Puck's orbit around the planet if ...
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4answers
107 views

How to define operational altitude on other planets?

Since different planets have different gravity, atmospheric pressure, air density and composition, it's obvious that a definition of operational altitude based on earth sea level is inadequate for a ...
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3answers
1k views

Black holes as heat sinks

Cooling in space is a well known difficulty. There are many unpleasant consequences like no stealth in space, difficult space battles which turn into a short wars of attrition (because you have to ...
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2answers
108 views

What phenomenon (gravitational?) in space would allow the transfer of humans rapidly between two planets or system-wide?

So what I'm looking for is some plausible idea of two human planets, orbiting each other closely, that despite having regressed to a medieval homage, were capable in this old era of powering solar ...
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3answers
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What thickness of atmosphere and strength of magnetosphere would I need for a planet to have a deadly daytime and a hospitable nighttime?

What thickness of atmosphere, and strength of magnetosphere, would I need for a planet to have a deadly daytime and a hospitable nighttime? I'm wanting a planet in which humans can survive on as long ...
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0answers
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Could a rogue planet support life? [duplicate]

I was wondering whether a free floating planet could potentially host life. If so, how? I was thinking of a geothermically active planet, where the only source of heat comes within the planet itself. ...
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2answers
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A pair of similar celestial bodies coming near each other

In my conworld I have two moons (they could be planets if desired as long as they can stay 'close' to a larger nearby body) of habitable size. I want to reality-check and provide an explanation for ...
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6answers
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Can a planet have a different gravitational pull depending on its location in orbit around its sun?

As the title say, can a planet have a different gravitational pull depending on its location in orbit around its sun? Is this explainable without magic?
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4answers
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What factors affect how many moons a planet can have?

A moon is just a natural satellite - something orbiting a planet - so I'm interested in what kind of factors influence how many moons a planet can have, and how many moons a planet will actually have. ...
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0answers
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How would an “minecraft-like” dimension behave? [closed]

The "dimension" I'm building, consists of earth-like plane that stretches on to infinity. It's a soft sci-fi universe and this dimension is man-made. The land has infinite mass, I don't know what ...
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4answers
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Would a high gravity rocky planet be guaranteed to have an atmosphere?

I want to create a planet with a deep gravity well, say about 12G at the surface. At first I wanted the planet to have either no atmosphere or a very thin one. But I want this to be as close to ...
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3answers
125 views

Why would jupiter brain be completely devoid of ocean? [closed]

Jupiter brain is known as a colossal computer the size of a planet, if heat dissipation is a concern when constructing it how come most models lack an ocean of distilled reverse osmosis UV treated ...
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2answers
179 views

Effects of a supermassive ship crash landing on a planet

My planet is a 20% larger than the earth, assume a similar atmosphere, but it can be changed to fit the narrative. My ship is not so large as in the original question, a cylinder shape, about a ...
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2answers
123 views

Designing a super-comfortable Earth analog

Being an engineer and someone who hates hot summers and frigid winters, and someone who really likes the Rocky Mountain view, I can not help but wonder if we humans could get to design a whole new ...
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3answers
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How to calculate the thickness of the ice-layer of a frozen ocean planet/moon?

How do I calculate the thickness of the upper ice layer on cold ocean worlds like Europa, Enceladus, Ganymede, ...? I'm asking this for a programm I'm currently writing. Given/Known is: mass, radius, ...
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3answers
177 views

How to make plane without coal, steel and oil

My world is far away exoplanet with water and some oxygene, but without life or plants, which means without coal and organic materials inside. High tech people from Earth come there and made some ...
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11answers
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Is it possible to have a strip of cold climate in the middle of a planet?

Would it be possible to have a region on a planet that is not near its poles that has below freezing temperatures most of the year, while having more temperate regions both above and below it? If so ...
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4answers
133 views

How far away from a Sol-class sun could a planet be and still be habitable?

In my galaxy, I need a planet that is far enough away from its star to be relatively cold compared to Earth, but not so cold that liquid water cold not exist. The planet has 2 continents, 1 northern ...
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17answers
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How could a planet have erratic days?

I want to describe a world where one doesn't know how long the day will be. It can be anywhere between 18 and 30 Earth-hours. Would such days be possible in our reality?
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1answer
149 views

Meterology of double planets sharing an atmosphere

If two planets were tidally locked and shared an atmosphere, as described in this question, what would the weather patterns of the planets be like? What weather patterns would form, and could these ...
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4answers
286 views

Would storms on an ocean world harm the marine life?

On a habitable world completely covered in water, with no land above sea-level, there would presumably be storms of biblical proportions. Suppose this world has oceans so deep that the deeper layers ...
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6answers
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Inhabiting Mars versus going straight for a Dyson swarm

My question is as follows - let's assume our objective function is to have as many humans as possible living outside the confines of the Earth as soon as possible. For this, we need to provide those ...
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2answers
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How does steppenwolf planet generates typhoon?

In a distant future, a spaceship was investigating a gravitational anomaly somewhere within a chartered sector in the Andromeda galaxy. A disaster strikes and the spaceship was found marooned on a ...
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2answers
104 views

Planetary tidal locking causing asymetrical water distribution

Imagine a planet of roughly the same size as Earth with the same amount of land, the same atmosphere and the same proportion of water (other planetary parameters may vary from Earth like) that has ...
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1answer
125 views

Can you critique my sea temp map and answer a couple of specific questions?

I'm working on yet another iteration of a world map project. I'd like to ask for some opinions on the sea temperature map I've done: I also have a few specific questions about some areas on the map. ...
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2answers
150 views

Will winds always be the same?

Around Earth's equator, there's a band of low pressure called the Doldrums. 30 degrees north and south are bands of high pressure called the horse latitudes. Finally, there are more low-pressure bands ...
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2answers
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What's the minimum time that it would take for an advanced species to create an ecumenopolis?

In figuring out the rough timeline for my sci-fi, I've run into an interesting dilemma. As it stands right now, There are about 90 years in between one of my civilizations discovering space travel and ...
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3answers
102 views

Is it possible for the remnants of a planet to be locked in orbit around another in a dual planet system?

I'm envisioning a double-planet system where both orbit around a central point. One planet is approximately Earth-sized, while the other is about one-tenth the size. One of the planets (the smaller ...
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3answers
77 views

Types of life on a planet in a sun-synchronous orbit?

Basically, a sun-synchronous orbit is where one side of an object is always facing a star as it revolves around it (much like our Moon is, which is where the phrase 'dark side of the moon' originates')...
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3answers
123 views

Earth like planet with two moon like satellites

I was thinking about this world with different ancient factions on war. The war caused both of them and most life on the planet to die, I was thinking about one of the moons getting shattered as a ...
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5answers
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What could trigger powerful quakes on icy world?

Imagine a planet orbiting a star some billions of lightyears away from us, the planet is 4 times the mass of Earth and is covered with ice 100km thick on average. It is believed that liquid ocean ...
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4answers
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How can I keep my planet the safest in the galaxy and still engage in war?

Background info In the galaxy that I'm working in, 20 other nations exist. Around 15 of them possess thousands of planets and billions, sometimes trillions of people (they spread throughout universal ...
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5answers
218 views

160 Year Solar Orbital Period & 1.9 Year Moon Orbital Period - Is it possible?

A defining factor of my world is the hardships inhabitants have to face when surviving long seasons. Due to the extreme length of a year, time is largely measured by moon cycles. I need to make sure ...
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2answers
129 views

Carbon cycle on planet with mainly CO2 atmosphere

What effect would having CO2 in your atmosphere in place of, on earth, Nitrogen have on the carbon cycle? would the carbon cycle even work? I'm engineering A theoretical tidally locked planet with an ...
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1answer
92 views

What would climate be like on a tidally locked planet? [duplicate]

How would climate behave on a tidally locked planet? Would there be zones like the ones on earth or not?
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3answers
440 views

How can I get different colours of ocean? [closed]

We think of oceans and large lakes as being blue. How can I get other colours in a way that is reasonably compatible with what we know from terrestial bio-geo-chemistry?
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4answers
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Designing the most boring planet ever discovered. Part 1: planetary surface

@Gryphon has made me aware of this The Least Interesting Substance It is very close but I need a planet that can form naturally. Would any of the substances mentioned in answers to that question be ...
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4answers
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Is is plausible for an Earth-like planet to have all of its land located in one polar hemisphere?

I made a map for my fictional world and it would be convenient for the story to have all of it affected by a somewhat similar climate. The map is made of several pieces of a Pangaea-like continent ...
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2answers
173 views

Properties of a planet roughly four times as big as Earth

I have some research I want to do about a planet for a novel I'm writing. It is a fiction/science fiction novel, but I do wish to actually have some parts of the world correct in the scenes I depict. ...
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2answers
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How would gravity affect a torus-shaped planet? [duplicate]

My planet is a Super Earth about twice the mass of Earth. I'm not asking how it formed, although that would be nice to know. I mostly just want to know how long it would stay a torus shape, and how it ...
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2answers
160 views

Terraformed Venus and Mars

A Traveler from a very advanced civilization has visited the Solar system. He found the humans likable, and decided to leave them a boon. For some reason, he couldn't do anything directly to the Earth ...
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4answers
180 views

Water planet turns into desert world without being rendered uninhabitable

A habitable (human could survive in its atmosphere without suits) desert planet which used to have large oceans is quite common in ScFi. I was thinking about the processes which could have been ...
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13answers
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Can a planet be tidally unlocked?

In my answer to another question, I suggested that the Super-Earth in question be tidally locked to its host star for a period of time while part of its surface experienced a bombardment. After that's ...
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8answers
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How to explain one side of Super Earth is smoother than the other side?

A spaceship flew across an unclassified region of the Milky Way galaxy and found a Super Earth in an unnamed system. The planet is almost twice as massive as Earth and is orbiting fairly far away ...
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2answers
141 views

How do I figure out temperatures and amount of sunlight for a world?

How do I figure out the temperatures of certain latitudes on a planet with factors such as sunlight and the emission of heat and energy from a planet's interior? Assume the planet is smaller than ...
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1answer
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I'm trying to create a planet with a purple sky, human life on planet not necessary [duplicate]

I think that it could be possible with a red sun, and either massive oceans containing algae or a surface covered with active volcanoes. What would my atmosphere be made of, and what color would those ...
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5answers
236 views

How can this habitable planet have a moon with a naturally occurring atmosphere?

Assuming the planet is earth-like, with more surface water and atmospheric oxygen, and within the habitable zone of a sun-like star, how can a moon orbiting this planet retain a thick atmosphere? The ...
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2answers
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What color should the snow be in this chlorine world?

This question is in the same context (the same world) proposed by Steven L. Gillett in his book: "World-building". And actually there have been some other questions about this same chlorinated world. ...