Questions tagged [planets]

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

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8
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4answers
147 views

how could we as humans live on planet mercury?

I have some research that it needs a good space suit to protect you from heat and cold but I need more so, what does planet mercury need to sustain life for humans? what could we as humans do to have ...
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2answers
108 views

What is the size limit for a rocky planet in orbit of an O type star, within the habitable zone?

As asked in the title, what would be the upper limits to a rocky planet's size in orbit of an O type star, like 10 Lacerta's habitable zone? Density of the planet must be enough to stand on without ...
8
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2answers
152 views

How would oceans of supercritical CO2 on Venus-like exoplanets look like/behave?

Carbon dioxide turns supercritical above a pressure of 73 atm and 304.25 K (31.10 °C). The surface of Venus fullfils these conditions. The density of the air at the surface is 67 kg/m3, which is 6....
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2answers
104 views

Is it possible, with modern technology, to hold a small planet in place?

In one of my universes, Humanity found a so-called "world anchor" on the Moon. They removed the anchor and returned to Earth. A few days later, the Moon exploded and a planet about the size of Mars ...
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2answers
116 views

What kind of star will work for my system?

After what feels like forever and after asking several questions (like this, this and this), I believe I may have decided upon a suitable orbital system for my world: $M_{S}=2.272\;571\;144\;5 \times ...
2
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1answer
133 views

Is it possible to make a stable planetary system like this, and what would the orbits have to be?

I have a K-type star (0.5 stellar masses) as the central body, and the planets are as follows (those I want to be in the habitable zone in bold): I: An uninhabitable rocky inner planet 50% the mass ...
8
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3answers
268 views

How could formamide lakes form on an exoplanet?

I've been recently looking into alternative biochemistries for life and the environments were these could be found. I already asked a question about how ammonia oceans might form a while back. Today I'...
2
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2answers
136 views

Could a “bouncy planet” work in principle?

Would it be possible to have a planet created by a God - but still obeying the known laws of physics - to have a bouncy surface that would be strong enough to bounce any large incoming matter, like ...
2
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2answers
130 views

A large planet composed of all natural elements is created. What happens? [closed]

In my story, I am playing around with the idea of a planet being primordially created by gods. This planet consists of nearly all of the natural elements in the universe, and in equal amounts. Let us ...
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4answers
116 views

Could a terrestrial planet become a gas giant?

I know that gas giants are much larger than terrestrial planets, but wouldn’t several million or billion years allow for it to gain mass from collecting space debris and the like?
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1answer
99 views

How tall would animals, trees and “humans” grow on a planet with those characteristics?

I am working on a planet were life (trees, plants, food, animals, humans) would be bigger/taller than Earth. I have learned that oxygen level or gravity, for example, could help change the size of ...
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3answers
167 views

Fiction / Theory: Produce gas version of solid elements

I am creating a sci-fi like game. I just want to ask if there is a theory how to produce gas version of solid elements in our periodic table. One of the notable element will be Silver and Copper. if ...
4
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2answers
159 views

How can I have an Earth-like moon?

My story takes place on the moon of a large gas giant planet. I have been trying to decide on a way for the moon to be as Earth-like as possible, but I have now decided to ask the community for help, ...
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9answers
1k views

Realistic ways a Planet or Large Moon could have Variable Day/Night periods

Hello I imagine this is a pretty straightforward question, perhaps already covered in another post, but I wanted to get extra perspectives and options for achieving this type of planet or moon. So ...
5
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1answer
91 views

Could a binary planet system have a shared magnetic field?

I want to have a two-world binary planet system where both have intelligent life, orbiting a single star. The two planets are assumed to be tidally locked to each other and orbit each other every 36 ...
3
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1answer
111 views

Climate in an hypothetical Planet [closed]

Let there be absolutely none, exactly 0 axial tilt. Let the earth's orbit around the sun be a perfect circle with 0 eccentricity and a surface to surface ( constant) radius equal to the harmonic mean ...
5
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6answers
244 views

Could this method of moving planets work?

In my last question about methods of deflecting a rogue planet, there was a fascinating answer from Willk. Willk basically suggested that if you knew the location, mass and velocity of objects in the ...
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2answers
139 views

Could we move a gas giant by venting its gas?

Could humanity move a planet such as Jupiter by forcing it to vent its gas? Assuming we have the technology to do huge mining operations and use these to make some of Jupiter's moons into a huge tube ...
7
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2answers
251 views

If humans evolved on Mars instead of Earth, how quickly would we have detected life on Earth?

Suppose that both Earth and Mars was booming with life in a similar way. Except that, on Earth, there was no hominid family, and no humans evolved. Instead, humans evolved on Mars. Assuming we had ...
35
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12answers
7k views

How Would Civilisations on Different Planes of a Cube Planet Interact?

If there was a life-supporting planet that was cubical rather than spherical, would it be feasible for there to be a unique but similar civilisation on each 'Plane'? I know that cube planets are ...
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1answer
163 views

3d printing Communism [closed]

Imagine this, Printing advances til everyone has one. 2030-50 timeframe There is a public utility Electricity credits are issued equally to everyone to run their printer Then people can make ...
4
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2answers
111 views

Adaptations for an ice planet?

My planet is a frozen world. Roughly the size of earth and in a perpetual ice age. The planet has very cold temperatures at night and during the day its surface becomes very bright. The intense solar ...
6
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1answer
119 views

What does and doesn't work with this planetary system around a red dwarf?

So I have the following scenario for a story, and I want to know if it runs into any ridiculous no-nos from a scientific point of view: There is an earth-like world orbiting a red dwarf (similar to ...
6
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1answer
146 views

How to calculate the average temperature of the hemispheres of a planet tidally locked to its star?

I have a planet orbiting a red dwarf and, as expected, it is tidally locked to its star. I know that these planets will have a very significant temperature difference between the diurnal and nocturnal ...
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10answers
409 views

What would be a good reason for space colonists to lose their technology?

In my universe, humans nuked themselves in a war so thoroughly that the Earth has been rendered uninhabitable. As a result, they have to leave Earth and find a new home. They briefly tried to settle ...
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16answers
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What plausible reasons why people forget they didn't originally live on this new planet?

It's a major step forward for humanity when they can finally live on a new planet. Maybe they went there out of desperation to survive, or maybe they simply want to explore. Either way, they suddenly ...
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6answers
302 views

How to dry an ocean planet and turn it into a salty desert?

I have a planet covered with a large shallow ocean, which extends over most of its surface. I want to turn this planet into a great desert, specifically a salty desert (the salts of this desert are a ...
4
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6answers
305 views

Could there be a planet where no electrical device works but that it can house life?

Far, far away from the Earth, there is a planet. A planet full of life. Where an intelligent species reign above all. But they haven't mastered the spirit of the thunder, and they will never. This ...
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3answers
807 views

Could a solar system exist inside of a nebula which is made of breathable gases?

Far, far away from the Earth, there is a nebula. An enormous cloud made of 78% nitrogen, 20% oxygen and 2% other non-lethal materials. These gases swirl around a star, and the pressure around it is ...
5
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3answers
210 views

How would iron smelting work in a planet with no oxygen?

Imagine a small planet, rich with iron, but with a negligible atmosphere, mostly devoid of oxygen. Once harvested, how could iron ore be smelted and refined into iron? And would the ore itself be ...
6
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3answers
209 views

How Likely is a Planet Made Almost Entirely of Metals?

For this question, the word 'metals' does not refer to elements heavier than hydrogen and helium. It instead refers to metals as defined by the periodic table of elements. After researching the ...
7
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1answer
391 views

Can a Planet's Electromagnetic Field Be Strong Enough for Wireless Electricity (Induction)?

Wikipedia states: "Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor in a changing magnetic field." This one sentence ...
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2answers
163 views

Thunderstorms but with Fire!

The planet is huge roughly four times the size of earth, with lots of hydrogen in its atmosphere (group A water in Hydrogen out, B water out.) it is also very humid. what do I do to have giant Storms ...
6
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4answers
266 views

Cool way to see through fog and darkness

My planet is frequently set with thick fog. What is the best way to have its residents see accurately? One species called Hell Fires fall from the sky, landing on top of prey and killing it. How ...
5
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4answers
223 views

Can a Jupiter-Like Gas Giant Have Deep, Dark Storms?

For this question, I was inspired by the following image of the "Jupiter Abyss": What I want to know is, can a Jupiter-like gas giant have thousands of giant black storms, kind of like what I've ...
5
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4answers
119 views

Could a new planets plane be at a different degree as the other planets in our solar system?

I read this and wonder now, what if we would introduce a new planet to our solar system; would the force of gravitation demand a similar plane as that of the other planets? Mercuries 6.3° indicate ...
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2answers
85 views

Would lots of hydrogen in a atmosphere cause Fire Storm [duplicate]

Basically Group A Breaths in water and out Hydrogen, Group B in Hydrogen and out water like us and trees but water and hydrogen instead of oxygen and carbon dioxide. Would the hydrogen in the ...
4
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1answer
160 views

Making a planet with high humidity

I'm making a Region of a planet with very high humidity, mostly covered in fog at ground level. I am open to having seasonal changes and would like there to be a few sunny days lets say 1 out of 15, ...
3
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2answers
198 views

Is an earthlike planet with ammonia oceans even plausible?

The idea of a planet where ammonia replaces water as the dominant liquid in the environment is quite popular in science fiction. I tried to develop a scenario where these kind of oceans are plausible ...
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4answers
2k views

How big would the ice ball have to be to deliver all the water at once?

One popular theory to explain how Earth got its water is that it was delivered by asteroid/comet/etc. The form this theory usually takes is that many small impacts occured over a long time, each ...
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19answers
8k views

What would influence an alien race to map their planet in a way other than the traditional map of the Earth

I was looking through a bunch of different ways we can shape a map of the Earth and it got me thinking. We map out planet as a stretched rectangle with NSEW as Up Down Right Left, with the Equator ...
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5answers
2k views

Which place in our solar system is the most fit for terraforming?

Far in the future technology has evolved to the point that humanity is able to try and terraform something in our solar system. The moon is out, since it's too close to earth and therefore to risky, ...
0
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1answer
58 views

Maintaining Earthlike Gravity on other Worlds/Stations [closed]

I am writing my first short story in science fiction and am struggling with the issue of gravity. TLDR: What would it take to make a planet match Earth's gravity (e.g. Titan (yes, it's a moon but ...
10
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3answers
406 views

What's a Good Sphere-Mapping Resource?

After reading the help sections for asking questions, I am now confident that my question does in fact appear to be on-topic and in scope for this website. I currently use a page called PlanetMaker ...
7
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1answer
86 views

Creating a Realistic-Looking Rocky Moon

Originally I was going to ask for help in the process of designing moons in general, but this is such a vast topic that I decided to narrow it down. I'm trying to create rocky moons or planets. I ...
12
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3answers
5k views

Can planetary bodies have a second axis of rotation?

Is it possible for a planetary body to have a secondary axis of rotation? For example let's say there's an Earth-like body that is spinning with its North Pole facing the Sun. Imagine that the North ...
2
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1answer
94 views

A desert planet with temperate polar regions could sustain how much plant-life? Any?

One proposed type of desert planet is one in which the equator and the "tropics" are harsh, hot deserts, but the polar regions are temperate, habitable, and lush with life. You can see an example of ...
4
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1answer
127 views

Tidally Locked Planet, Weather

If the polar cap of a tidally locked planet was all ocean, what weather patterns would emerge? The ocean couldn’t be half frozen/half boiling, right? I need a weather pattern so the planet isn’t just ...
3
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3answers
153 views

Would an exoplanet highly rich in Iron (and other metallic properties) have any effects on technology?

Im working on a story about a new exoplanet discovery and its subsequent "Near Future" colonization. The planet is close to its parent star. As such, I have decided to give it a sizeable molten iron ...
1
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1answer
68 views

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 ...