Questions tagged [planets]

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

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Gravitational and Electric Forces in the Movements of Planets

Now that we know about the electric nature of the cosmos, the question arises: "How much are planets affected by electric forces while moving through the universe?" We have been taught that the ...
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3answers
128 views

How Can I Explain A Giant Equatorial Gash

I have a moon in my story that has a thin, deep gash or canyon that lies on its equator and spans the entire moon. My original idea involved the sudden orbital decay of a ring system, caused by a ...
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4answers
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Human colonies beyond Pluto (on a potential ninth planet)

To be able to colonize another world, there are some requirements; the harvesting of energy, enough recourses, handling of the environment (pressure, temperature and gravity and so on) and ...
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33 views

Explaining Planet Colors/Compositions [on hold]

I want to be able to explain: the coloration of my planets when I create them, but I don't have enough knowledge on the colors of elements or chemical compounds. I have done extensive research into ...
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1answer
931 views

If we were to assume the shape of planet Popstar from Kirby is kept that way artificially, how would the shape affect its day/night cycle?

Making a semi-realistic Kirby Alternate Universe (AU) here. Popstar's shape is a result of a member of this powerful race using secret magics to alter reality in this AU. What would its day/night ...
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3answers
269 views

Can a planets magnetic field be strong enough to make floating continents?

I have a planet similar to Venus(similar size and atmosphere) that has floating continents in the atmosphere due to strong magnetic fields. If it is possible, what would the continents need to be made ...
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2answers
96 views

How could a planet have traveling geographic poles?

I want to build a world that has its geographic poles travel like the Earth magnetic poles do. What is a plausible way to do this? (besides giving it two suns that is)
5
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1answer
49 views

Changing air composition on another planet

Hypothetically speaking, if we would find another planet, the size of Earth, with atmosphere as dense as Earth's atmosphere is, and we would insert (in some hypothetical way) nitrogen, oxygen and CO2 ...
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4answers
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Why would one hemisphere of a planet be very mountainous while the other is flat?

Background I just read this question about how to get a planet to have one hemisphere with tropical climate and one with polar climate. The (not yet accepted) answer with the highest score ...
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2answers
106 views

Can a planet mostly covered with water exist in a perpetual sunset?

I have read many posts about planets in perpetual sunset or twilight. Tidal locking, perpetual sunset at the poles of a planet with zero axis tilt, and so on. Great information by the way. This ...
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6answers
667 views

Can there be a unique planet visible each different month?

In my world, ten is an important number that shows up frequently. In the solar system my world belongs to, there are ten other planets beside it, and there are ten months in a year. I know next to ...
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1answer
177 views

What is the fastest an earth-like planet can spin and still support life, and would it be possible to launch space-craft from it?

I was wondering, if a planet in similar size and mass to earth would have, from its creation, been spinning at this hypothetical planet speed limit (with it somehow staying in once piece) could life ...
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How could a planet have one hemisphere way warmer than the other without the planet being tidally locked?

I would like a planet that's a tropical paradise on one side but covered in ice and glaciers on the opposite side, whether it be the Southern-Northern or the Western-Eastern hemisphere. I know it ...
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9answers
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Can there be plants on the dark side of a tidally locked world?

In my story, there is an Earth-sized planet orbiting a red dwarf, tidally locked to its parent star, with large oceans like Earth, two moons similar to ours and a thick atmosphere to distribute heat ...
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2answers
123 views

Longest “linear” natural formations

In an effort to gain inspiration for planetary formation and, at the same time, inspiration for governmental/territorial boundaries between residents of said formed planets, I've recently encountered ...
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1answer
85 views

Earth like planet, more surface area under water?

Planet: earth like, half the radius of earth, gravity is .7g. Assuming this is possible and humans live on this planet, would it be possible to have 90% of the planets surface area be under water? ...
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4answers
863 views

Can this planet in a binary star system exist?

In a certain star system, Star B orbits Star A. Planet C lies in between the two stars and also orbits Star A. Planet C and Star B share an orbital period, and are at roughly the same places in that ...
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71 views

Super dense planet? [closed]

What's the most dense a planet could be and still be livable? How does water factor into the overall density of the planet. Is something like an osmium or iridium core even be possible/realistic? If ...
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4answers
224 views

Is it realistic to have a livable planet with a quarter the size of Earth, but with the same gravity?

So in theory, I would want this planet to have the same everything as earth besides the radius (and anything that affects how radius plays into gravity). I know the density of this Planet X would have ...
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What would a bromine based atmosphere planet be like? [duplicate]

OK, some of you may recognize this from a previous question, but now it's refined. After seeing this video by Artifexian: https://www.youtube.com/watch?v=fwauz9uIl9M, I thought I should take a stab at ...
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1answer
85 views

Terraforming a tide-locked planet

Over several hundred years, a tide-locked, but otherwise Earth-like, planet orbiting a red dwarf is terraformed. The terminator is a very habitable zone, in terms of temperature, atmosphere, etc. ...
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1answer
89 views

How to find the density of a planet and its core taking into account the gravitational compression in them?

Consider a planet $P$ of radius $r$ larger than Earth, whose mass is $r^3$. By the square–cube law, this planet will have the same density as the Earth... assuming that the gravitational compression ...
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3answers
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Can my planet have a very thin atmosphere only at the poles?

While thinking about Starfish Prime's answer to the question Algae using UV light from auroras for photosynthesis, I considered the possibility of an alternate Earth which has a normal, Earth-like ...
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6answers
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Can realistic planetary invasion have any meaningful strategy?

The sea is used as an analogy in space travel, and sometimes it works well. Ships sail on long journeys, between distant lands, across a hostile medium. But these analogies tend to break down when it ...
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1answer
111 views

Will my planet work? (size, gravity, atmosphere)

I was going to sort this all out beforehand, and then write the book, but when the writing flows... you make hay. I am a perfectionist/details-oriented person, but you lose me on math/hard science. ...
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105 views

How has Venus held onto its atmosphere [closed]

Without its magnetosphere, how has Venus held onto its atmosphere, when Mars lost its atmosphere and water when its magnetic field was turned off?
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3answers
117 views

How to find the radius of a planet given its internal composition?

Consider a planet very similar to Earth, with the same radius and the same mass. In a very simplified model of its interior, 70 % of its mass is magnesium silicate and the remaining 30 % is iron. This ...
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3answers
206 views

Is a carbon planet with seas of methanol on its surface scientifically possible?

I am creating a carbon planet with seas of methanol on its surface, but I am not sure that this is possible. It is predicted that carbon planets are depleted of water, since the available oxygen ...
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1answer
86 views

How different would the internal composition of a carbon planet be from that of Earth?

My idea is a carbon planet 50 % larger than Earth and with 5 times its mass (approximately), but I set these values ​​after investigating those of several discovered exoplanets and none of them is ...
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9answers
2k views

Why would humanity have left Earth 2 so quickly? [closed]

In the world I am building (based heavily on the Star Wars universe setting, but more historical), humanity first abandoned Earth to travel to another planet within their solar system, which they ...
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1answer
114 views

What would be the consequences of a planet having a core predominantly made of Krypton?

So I'm currently working on a fan project to redesign Superman's home planet of Krypton. This new Krypton is 1.6x the size of Earth and orbits the red dwarf star known to us as LHS-2520, 27.1 ...
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1answer
153 views

Can we realisticly ever land on alien planet? [closed]

This question is heavily inspired by Netflix series Another Life We build another worlds to be explored. Mostly by humans. However, reckless behavior of space crew of ship Salvare made me realize, ...
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10answers
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How can glass marbles naturally occur in a desert?

I had a dream that on my alien planet, there was a large desert that had naturally occurring glass marbles in the sand. My dream logic was that the sand was melted into glass and natural weathering ...
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0answers
311 views

Plausibility of helium dominated atmospheres on super-Earths

I've been using this helpful diagram a lot for worldbuilding. Now I came to think about the fact that helium is more massive than hydrogen, thus a scenario where hydrogen escapes, but helium is ...
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6answers
4k views

Subtle ways to render a planet uninhabitable

A violent way of rendering a planet uninhabitable being the obvious: accelerate a large enough object to a sufficient velocity that everything on the planet goes the way of the dinosaurs. Put briefly,...
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5answers
376 views

What sort of solar system / atmospheric conditions, if any, would allow for a very cold planet that still receives plenty of light from its sun?

The setting I'm interested in would involve a cold planet (cold enough for most bodies of water to be frozen - I'm thinking of an average global temperature of -20C or below). The simplest way would ...
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2answers
249 views

Is there a website that will run orbital simulations because I don't have a PhD in math

I'm just trying to write a RPG adventure for a sci fi company. So when I have to figure out what kind of orbits, masses, major axis, etc are needed for the system I need to design and I see: $T=2\pi$...
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5answers
346 views

Can early astronomers determine the gravity of their planet's “moon” without ever going there?

As I was thinking about space flight for my world, I thought about how they would need to know a planet's gravitational force before they could land, and found that humans figured out the moon's ...
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2answers
167 views

What could cause a planet to be in shadow for a 6 earth month period every couple of earth years?

My previous question ruled out having a moon orbiting a gas giant. I've got an interesting ecosystem (my bad, biome was the wrong word) that evolved based upon the idea that the world is eclipsed for ...
11
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8answers
5k views

Surviving a planet collision? [duplicate]

Let's say there are two planets about to collide. Ignoring how they got there, it seems that in most scenarios basically all life gets annihilated by energy released the collision. How slow would two ...
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2answers
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How long until two planets become one?

Two Earth-like planets collide at a (relatively slow) speed of about 1,000 kph. For all questions regarding the size and composition of these planets, just think about Earth - and these two planets ...
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5answers
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Could a singular planet have more than one diverse atmosphere?

I'm making a world which is set on a planet with two smaller "bubbles" of atmosphere at the poles, and a more stereotypical atmosphere that surrounds them. Each of the three atmospheres has a ...
11
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2answers
195 views

Rogue Planet Illuminated by Galactic Centre

The black hole question reminded me of an idea I wanted to implement at some point in a space campaign, but didn't go forward with because I was unsure whether it's merely statistically very ...
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3answers
146 views

how could I move an earth sized planet? [duplicate]

How could a Kardeshev II level society move an earth-sized planet at high speed, without killing everything on the planet and access to all of the resources in a solar system similar to our own? what ...
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4answers
4k views

A planet illuminated by a black hole?

Is it possible for a planet to be heated and illuminated by a black hole due to Hawking radiation at the same intensity as by a star? What mass and size should a black hole have to produce the same ...
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9answers
5k views

Keeping an “hot eyeball planet” wet

Consider such a tidally locked planet: Many issues with tidally locked worlds have been discussed, but I'm not clear on how the water cycle for an otherwise Earth-like tidally locked world, would be ...
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1answer
277 views

Conditions of a more ideal version of earth

What would be the specific conditions required for a planet to be a more ideal version of Earth? I want the world to have a much larger proportion of land covered by lush jungle and forest ...
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1answer
140 views

Would A Biological “Cold Haber” Process Deplete an H2/N2 World of its H2 or N2?

Based on my reading on some science papers, large, wet terrestrial planets likely exist that are swathed in a thin atmosphere of nitrogen/hydrogen ($H_2$ & $N_2$). If life evolved on such worlds, ...
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3answers
401 views

Aliens blew up Pluto so we would stop debating whether or not to call it a planet, what happens to Earth? [closed]

It seems the Fraxians, an alien race from Alpha Centuri, have been secretly watching our television ever since we started broadcasting it (well technically I suppose 4.367 years after we started ...
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1answer
104 views

What's the climate consequences of a planet with these characteristics?

I'm designing a new planet, but I'm having some troubles figuring out the climate. The planet's rotation axis is at a 45° angle relative to its orbital plane, and each rotation takes 24h. The planet'...