Questions tagged [planets]

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

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2answers
88 views

How to get time to pass faster on another planet compared to earth?

I'm developing a story where humans colonize a few planets. One planet, lets call it Planet A, has similar gravity to earth, air pressure, and solar radiation. You cannot however, walk on the surface ...
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3answers
53 views

Is this planet-moon system possible?

The planet is 10 Earth-Radii, with a 1 Earth Gravity value. It is a habitable planet. It has a thin atmosphere. It also has 3 moons and a ring system. The moons are rather large. The largest one is ...
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Software for creating a 3D planet

(Sorry for my english, it's not my native langage and i use translate google...) I am looking for one or more software to create a sphere in 3D with longitudes, lattitudes, etc. Rotate this sphere. ...
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3answers
145 views

How large of a moon could an earthlike planet possess

Suppose I want to have a moon with more gravity than ours how large of a moon can I have and what effects would there be.
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Inverse orbital direction

Is it possible that a planet/moon will have inverse direction comparing to the rest orbiting material? For example Mars would go in counter direction comparing to other planets in solar system. If ...
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1answer
40 views

Small planet tidally locked to a red dwarf which is orbiting a main sequence star

I'm working on creating a planet that is tidally locked to a red dwarf, which is in turn orbiting a main sequence star which is much further away. My idea is that the tidally locked side of the planet ...
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2answers
59 views

Effect of brighter suns on eyes on a creature on a world orbiting a red dwarf

I know that red dwarf stars are dimmer than ours. But I also know that red dwarf stars emit a lot of infrared light, so creatures on a world orbiting it would have eyes that see infrared light. If a ...
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1answer
105 views

Planetizing the World of Jack and the Beanstalk: How Small is Too Small?

We all know the tale of Jack and the Beanstalk--a farmboy sells his cow for some "magic beans", which in turn grow into a mountainously tall stalk that led him to the land of a giant. Now, ...
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1answer
172 views

How big could a planet get before collapsing due to its own gravity? [closed]

I was wondering, how big could a planet get, with gravity staying the same even with the added mass, before collapsing DUE TO its gravity?(without becoming a black hole) Specifically, I have a world ...
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Navigation on a planet with an eccentric orbit

On this planet, there is a nomadic tribe of humans who are the descendants of unwilling colonists from thousands of years prior. They are a nomadic tribe because of the incredibly extreme seasons, ...
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0answers
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Random galaxy, solar system, star and planet names? [closed]

For a game I'm making, what would be a good way to generate random names for: galaxys, star clusters, solar systems, stars and planets? I know one way is to call a star like "Betelgeuse Star". And ...
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131 views

Can adding mass to a ringed planet cause a huge chain reaction?

I've been wondering about this for a while. Here is the research I've done so far that lead me to ask this question: A planetary ring system is most often formed by the breakup of objects within the ...
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0answers
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What would seas of non-water liquids be like? [closed]

First off, is a sea of a non-water liquid even plausibly likely to occur on a given exoplanet? Secondly, what non-water liquids would be most likely to form into large bodies? How would those liquids ...
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1answer
80 views

Can an Io-like world exist in such conditions to allow this character to fly?

This character has a set of dragonfly-like wings. These are not normal for her species, and would normally be something of a birth defect requiring amputation. But through liberal application of ...
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4answers
294 views

If we dug a really big hole on Mars, how long would it last?

How long will a 400 km wide 30 km deep pit (trench or crater) with a relatively shallow (for stability) gradient of slope of 20 degrees from the edge to the surface of the planets crust be expected to ...
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3answers
159 views

is there a way to levitating entire body of water in earth and make it stay in the sky?

as the title, is there a way to levitate entire body of water in earth and make it stay in the sky (not cloud and still in liquid form) ? either natural or man made. the water either flowing or ...
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2answers
101 views

How can a powerless entity affect calamities around the world? [closed]

This is a follow-up question. How can I make my sealing ritual neccessary? The scarlett king is an ancient entity that exists across multiple dimensions, and seeks to enter our world. When the child ...
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1answer
67 views

How would sulfur-based lifeforms behave physically and anatomically?

This is completely ignoring the fact that lifeforms that aren’t based on carbon are entirely hypothetical. Could these lifeforms breathe oxygen like us, or would they need to use some sort of ...
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1answer
102 views

how can my “badlands” be made a permanent feature in a magical world?

When the gods created the mortal realms, they constructed them within self-contained material spheres. These spheres protect that worlds reality from the void, the chaotic realm that exists outside of ...
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3answers
104 views

What could cause my millennium-long ice ages?

Here on earth, it takes about 90,000 years for major ice sheets to build up, and another 10,000 for them to collapse, resulting in 100,000 year cycles of major glaciation, from what I understand. ...
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4answers
195 views

What would it take to make a scientific second equal exactly one traditional second?

A scientist is resetting the clock on his microwave one day as he considers the hopelessness of keeping the time exactly right. Not for the reasons we worry about like power outages and daylight ...
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4answers
167 views

How can an Earth-like moon meet these angular diameter conditions?

NOTE: If there is anything about this question that needs clarification or editing, please don't hesitate to let me know in the comments. Get ready, because you're in for quite a ride. I have tried ...
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234 views

Sniper team from different G-Worlds

The metric system (SI units) is a base-10 measurement system based on the meter, kilogram and second. But it is tied to earth. A second, which historically was defined as 1/86,400 of a day, now ...
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What planet composition is need to have giant human that make earth human similar in comparison to ant size to them?

as the title say my question is: What planet composition is need to have giant human that make earth human similar in comparison to ant size to them? i know realistically and probably its imposible ...
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2answers
138 views

Binary World Mechanics

I’m trying to develop a realistic system with a limited understanding of astrodynamics. Is it possible to have two binary worlds capable of sustaining atmosphere and complex life orbiting one another ...
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4answers
143 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
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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 ...
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2answers
127 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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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
113 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 ...
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1answer
115 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 ...
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3answers
252 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'...
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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 ...
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2answers
128 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
111 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
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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
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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 ...
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2answers
152 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
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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 ...
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1answer
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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 ...
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1answer
100 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 ...
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6answers
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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
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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 ...
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2answers
242 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 ...
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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
160 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 ...
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2answers
100 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 ...
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1answer
114 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
143 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
391 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 ...