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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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How would an advanced civilization on a space station not be able to explore the planet they orbit without significant time between each expedition?

Extremely advanced civilization on a computerized space station orbiting a desolate uninhabited planet. There are no other known civilizations within this station's sphere of observation. Not many ...
3
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1answer
57 views

Naturally maintaining an atmosphere being stripped by a brown dwarf‘s magnetosphere

In this scenario we have a brown dwarf with a powerful magnetic dynamo from metallic hydrogen. The magnetic field is modeled after Jupiter’s but just three orders of magnitude more powerful. ...
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0answers
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Plausible? Mechanics of Floating Continents/Islands on Gas Giant (with sea) [on hold]

Just thought of how a gas giant would have the physics to entertain floating islands/gigantic landmasses + a floating sea of water. Pretty much just wrote down whatever i could think of. Basically, a ...
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1answer
105 views

How to create matter in a solar system [on hold]

I looked to see if anything like this was asked, but can’t find. So a star is formed, the sun for instance., and creates a gravitational force on its own. After a billion years a kuiper belt ...
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3answers
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Could a gas giant have two earth sized moons in binary orbit around it

I’m trying to create a system where a gas giant has two moons in binary orbit with each other. I’m trying to get that James Cameron look with the gas giant on the horizon, but also have a equally ...
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5answers
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50% O₂ 25% Neon 23% Nitrogen and 3% trace gasses?

Could an atmosphere of 50% O₂ 25% Neon 23% Nitrogen and 3% trace gasses be survivable for a human being at the similar or slightly less atmospheric pressures as Earth?
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2answers
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What would be the mathematical formula to figure out a person's weight on a world bigger or smaller than Earth?

Okay, trying to figure out this math guys! This may be simple math to some of you, but not me!!! I googled various ways of asking this question and got some good results, but I'm looking for a simple ...
3
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2answers
118 views

Climate checking my map

So I've decided to come here to see how my map would be effected by climate. Notes: The planet has a 10° axial tilt, it's a little smaller then earth, and has earth like conditions. So my questions ...
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2answers
180 views

How long would a flat Earth last?

As we all know the Earth is flat. Once upon a time a group of explorers set off with the idea of proving that the world was round and that there was a route to the spice islands the other way, but the ...
6
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1answer
229 views
+150

Can someone help me with ocean currents? I'm really confused

I've been working on a constructed world which started out as the home of an alien race from a sci-fi story I'm writing but just became a pure world building project. As you can see from the map it ...
3
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1answer
101 views

Equation to get the size of a crater created by a meteor strike?

Im trying to find the equation to the the size of the resulting crater created by meteor strike when I have the mass, volume, diameter, density, velocity and kinetic energy of the meteor Can ...
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0answers
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Blackhole Effects on World [closed]

An Earth-like planet orbits a Sun-like star. That whole system closely orbits a black hole, closely enough that the time shift is 100 to 1 (meaning 100 minutes pass on Earth while only 1 minute passes ...
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2answers
250 views

Is a Titan-like planet with Earth-like gravity plausible?

For my hard sci-fi story, I would like to have a planet similar to Titan (very cold, nitrogen atmosphere, methane seas) but with a surface gravity in the region of 1g. Could this occur, or would the ...
3
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4answers
160 views

Would a hot North pole and cold South pole, would it be possible? [duplicate]

So would be possible to have a Hot (Tropical or Arid) North pole and a Cold/polar South pole with a certain planetary set up or geographic set up. I'm open to many ideas, as long as they make this ...
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1answer
76 views

Could life be living in Europa? [closed]

The ice is so thick that no probe sent from Earth can detect life under the ice. Radio would not work well under the ice so we could not communicate with Europians if they are advanced. What would ...
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2answers
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Planetary cave: Gravity inside a non-concentric shell

There are several previous questions concerning concentric shells. I won't reference them here because this is different. I understand that there is no gravitational effect inside a concentric shell*....
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8answers
233 views

Underground condition preventing plant growth on a planet

As title, what condition could prevent plant growth from below a planet surface? I've considered considered removing all water from the planet, both underground and above the surface, but that doesn't ...
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3answers
1k views

What would the night sky look like for a world on the upper plane of the galaxy, near its rim?

I would like to include a world in a story that is located on the upper plane (or bottom, doesn't matter, but call it upper for the sake of reference) of the galaxy. If you think of the galaxy as a ...
6
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1answer
142 views

How close from Earth could a wandering flare red dwarf star be without causing havoc?

Rewriting the question to clarify: The time and location is now in our current Earth. A wandering red dwarf flare star (like Wolf 359) is moving towards our Solar System. The question: How close could ...
4
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2answers
79 views

Planet Blob - variable gravity

On the planet Blob there is an unusual phenomenon. It is known to emanate from the planet's core but 2018-level scientists have no understanding of it. The phenomenon Gravity isn't constant. It ...
2
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1answer
185 views

Climate on a planet with huge tides

Tidea is a moon with an atmosphere orbiting a giant planet. Due to that, tidal forces on Tidea are enormous. I'm working on trying to understand how would the climate be on Tidea. Relevant things ...
2
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2answers
241 views

Dimensions of an O'Neill cylinder with gravity and coriolis force like surface of Earth

What would be the diameter and rotational speed of an O'Neill cylinder on the inside surface of which centrifugal and coriolis forces are equal to "gravity" and coriolis force on the surface of Earth ...
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1answer
155 views

What would a sea made of Iodine look like? [closed]

If it was possible, what would a sea made of liquid state Iodine look like? How would it smell? From my research, I've seen people saying its liquid state is somewhat "invisible" since it generates a ...
4
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1answer
106 views

How hard would it be for humans to colonize an exoplanet with a size significantly different than that of earth (but otherwise suitable for life)?

If you look at this list of potentially habitable exoplanets, very few of them actually come close to having the same size as Earth, this means most of them would have surfaces gravities significantly ...
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1answer
79 views

Estimates for undetectable planets in extra-solar systems [closed]

Based on answers and comments on some previous questions (especially this one), and as very clearly illustrated by the scatter-plot here, there are some very definite limitations on our ability to ...
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1answer
92 views

In the event of a space ship crash landing, where is the ship most likely to crash land? [closed]

This isn't a perfect map, and it's not a perfect model considering it is a 2D surface and my question relies on a 3D scenario, however it offers a general idea for what I want. In the bottom left hand ...
6
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2answers
201 views

How would humans look after living many generations on a terraformed Mars?

Let's say humans moved to Mars and have lived there for millions of years. Mars is of now uninhabitable, though in this case some terraforming has happened. The poles have been nuked to release ...
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5answers
302 views

Civilization on a diamond exoplanet?

If humans discovered a diamond exoplanet and then traveled there, how would they set up civilization on a diamond exoplanet? Everything needs a foundation, even on low-gravity planets (below 9.8m/s^2)...
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1answer
132 views

How humans could establish a colony on this planet? [closed]

Yesterday I created an exoplanet on Space Engine, and then started to imagine how life could be possible on that little rock. I started to think about bacterial cells / archaea, anaerobic organisms ...
3
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2answers
119 views

Would an atmosphere of supercritical CO2 affect available light?

Many of you may have heard that supercritical CO2 (as in at just the right temperature and pressure to be in between gas and liquid) is a possible alternative solvent for life, like water is for us. ...
6
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2answers
635 views

Habitable zone around a Blue Supergiant

I am writing a story centered around a planet orbiting a Blue Supergiant star. What I want to know is how far away a planet would have to be to be in the habitable zone of such a star. The star I ...
4
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4answers
275 views

What requires more destructive energy? Destroying a planet or splitting a planet in half

I just wanna ask which option requires more destructive energy? Option 1 : destroying a planet like earth to rubble (tiny pieces of rocks) Or Option 2: splitting a planet like earth in halves (2 ...
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0answers
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Thousand Plate World: Effects [closed]

I have found this idea on a discussion on /r/worldbuilding. Anyway, the premise is as follows: The planet is earth-like in terms of size and mass. The planet has a very large amount of small, active, ...
5
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2answers
272 views

Thousand Plate World: Formation

I have found this idea on a discussion on /r/worldbuilding. Anyway, the premise is as follows: The planet is earth-like in terms of size and mass. The planet has a very large amount of small, active, ...
4
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4answers
2k views

The plausibility of a water canopy [duplicate]

Once I heard a creationist say that the earth once may have had a hydrosphere layer up above our natural atmosphere, which implied that a substantial layer of ice covered the earth and created a ...
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2answers
195 views

Can a planet with chaotic rotation have more than one ring rotating in differents axis? [duplicate]

Let's say that planet earth have a big explosion . An explosion generated in earth big enough to change the planet shape. Making earth having a chaotic rotation like Hyperion leaving water and rocks ...
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2answers
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Finding the size of tides

I have a planetary system in which there is a huge planet and a moon orbiting it which has an atmosphere and water (and actually everything needed to sustain life). Thing is that I'm sure the mass of ...
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2answers
126 views

A Frozen Metropolis

Scientists have discovered an Earth-like planet in another solar system, with the same gravity, atmosphere composition, etc, and they decide to colonize it. There is only one problem, though. It is ...
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3answers
222 views

Waterless planet with vapor geysers

Humans find themselves on a really hard to survive planet. I have a good idea on how I'd like it to be, but no clue on how that could be possible. Atmosphere is breathable and temperatures make it ...
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3answers
224 views

Effects of 6 hours days on my planet

One of the planets I am working on is supposed to have a day of about 6 earth hours long & I’m wondering what effects this will have on its surface and climate. Also, I don’t know if this is ...
3
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6answers
185 views

Can I have a glacier on a tidally-locked shallow-sea planet?

I have a planet that is tidally locked to its sun. The ocean is shallow (a few hundred meters) and was artificially created in the past by harvesting the system's Oort cloud or outer-system ice ...
2
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3answers
102 views

What would the temperature variation of an outer orbiting planet look like in a binary system?

I am creating a binary star system with a likeness to the Alpha Centauri system with an outer orbiting planet like Proxima Centauri. On an earth similar planet what would the temperature variation ...
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6answers
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A Planet Where The Four Seasons Occur Multiple Times In One Year?

Earthlings, I live on a world where most places on my planet has four seasons, just like yours does. We also have one sun and one moon, presumably. It's been not even a year since I came of age (20), ...
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9answers
281 views

How to explain the presence of a dense debris field around Earth?

I'm creating a sci-fi world similar to ours roughly 50 years in the future. Unobtanium, a futuristic metal and fuel source, was discovered in 2020. Its broad utility led to rapid advances across all ...
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2answers
95 views

How would a colossal explosion affect an ocean-based planet?

In my book series, a space station called the T-Ray that is capable of causing explosions the size of the Chixculub impact explosion just fired at a planet that is completely covered by a massive ...
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2answers
127 views

Could the TRAPPIST-1 planets have moons?

The TRAPPIST-1 planets are all very close to each other and thus are subjected to strong gravitational forces amongst each other and to the red dwarf they're orbiting. Would it be possible for them to ...
5
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1answer
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How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
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3answers
1k views

How Would A Group of Undersea Explorers Survive if Their Food Supply Ran Out?

In my book series, a group of a few hundred explorers are sent from a planet called Ishgabangaloodoo to explore Sea World. Some things to know about Ishgabangaloodoo: Its citizens are referred to as ...
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8answers
289 views

Calendar dates on different planets

I have about five main planets in my fictional universe and like any planet, their days, months, and years are all different. Are there any problems that could mess the narrative up, since my ...
6
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4answers
226 views

Aside from low gravity, what conditions favor dramatic terrain?

Fantasy and sci-fi works often are set in worlds of dramatic terrain, because, well... it's dramatic. A few examples of the kind of thing I'm talking about: I understand that Earth has some ...