Questions tagged [moons]

For questions pertaining to natural satellites, such as our own Moon.

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5answers
129 views

Multiple moons with little effect on the planet

In general, I'm considering having my planet have multiple moons but at different points in its history, the count of the moons increase or decreases (like every few thousand years a moon comes or ...
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5answers
132 views

How would a crystal moon interact with light from the sun? Would a crystal moon reflect "too much" light for night time?

I have an earth-like planet in a fantasy setting with two moons, one of them made of crystal. It will be a fantasy crystal, properties TBD (probably by some of the answers to this question). My main ...
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3answers
155 views

Is this method of “burial” possible?

Now that colonization of Mars and The Moon is starting to pick up, lots more people will start dying. LifeHarbor Burials™ says that they will provide a way to dispose of the dead for free. They claim ...
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5answers
204 views

Endless global night.. but an agreeable climate, how come?

How would my planet develop an acceptable climate, without a sun ? There is no (visible) sun, but the climate permits STP, and there are 1 or more luminous, rocky moons providing some light. Perhaps ...
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4answers
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Is it possible to have a non tidally locked moon?

Fo my question, I'd like the moon to orbit around a saturn-like planet without rings. This moon would be located at a million kilometers away the host planet. the moon's size would be about 12 000 ...
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1answer
127 views

How plausible is this planetary system with binary stars?

In my world, I have a binary S-type Solar System of Star-A and Star-B with these properties: Star-A: Luminosity: 0.86822 Sol / Mass: 0.98097 Sol / Radius: 0.91958 Sol / Radius of Hill Sphere: ~37.218 ...
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1answer
185 views

Two large moons in horseshoe orbit possible? What effect on humanlike life?

I've decided that the planet I'm writing will have two moons in a horseshoe orbit, closely modeled off of Saturn's Janus and Epimetheus. For the purposes of this question, I'll be calling them Moon ...
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13answers
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Terminology for 24 hour wake-sleep cycle on world with longer dark-light cycle?

Take the Jovian moon Ganymede as a real-world example. It has an orbital period of ~7 days around Jupiter, which is effectively its day and its year simultaneously. My characters will need the words ...
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6answers
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How fast would the Moon (Luna) need to rotate so that anyone living in Lunar underground habitats would experience Earth-like gravity?

So I'm creating a sci-fi book, and I'd like to know a way to calculate how fast would the moon need to spin to create a certain amount of gravity, and how much energy would be required to get it to ...
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5answers
269 views

Is there a way for a permanent Lunar eclipse, or another Object to always be in Earth's shadow?

I have a question regarding worldbuilding and haven't found a question like this yet, so I created an account and hope that someone can answer it :D As a starting point, imagine our real-life Sun, ...
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3answers
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What is the largest possible appearance of a celestial body in the sky?

In SciFi Art we often see planets/moons/stars fill enormous amounts of the visible sky. I'm wondering what the theoretical limit for this is realistically, since there are maxima for the possible size ...
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14answers
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Always a full Moon for the Emperor - Can this be achieved with solar panels and LEDs?

The Emperor of the World wants there always to be a full moon. His Scientific Advisor (the SA) comes up with a plan. He plans to cost out the venture, hand it over to the Keeper of the Treasury who ...
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5answers
386 views

How can a moon be always full (no other phases)?

I'm writing a system where the moon is always full from the perspective of the Earth-type planet--it does not go through phases. Short of the moon itself being luminous, what would it take for this to ...
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3answers
203 views

How many tectonic plates should my moon have?

I have been wondering, what factors influence the number of tectonic plates a planet would have? Are there criteria to choose the number? Case in point, for my habitable moon project, here is the ...
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2answers
175 views

How Habitable are these Planets?

For the book I'm writing for my world, Damarian, the villains of the series (The NUSA, America's descendant) are banished off Damarian (Spoilers). The banished are shipped off, but 3 groups formed, ...
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3answers
125 views

Would the light reflected off of a blue moon and red moon combine into a purple hue on the surface of the local planet at night?

Edited: I suppose the setting doesn't really matter. Scenario: An earth-like planet in size and material and atmospheric composition experiences a phenomenon of purple light being the visible light at ...
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4answers
286 views

What would be the most likely compositions of the red and blue moons to so almost uniformly reflect their colours?

In my previous question I asked if two moons, one with a red surface, the other with a blue surface, were each to reflect different light wavelengths of an equal luminosity at the same time if they ...
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1answer
211 views

Where can lithium be found in the Solar System?

My question is pretty straightforward, beside earth, what celestial bodies could hold exploitable quantities of lithium-7 and lithium-6? I understand that lithium is a scarce element in our universe. ...
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6answers
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Can mirrors on the moon allow solar panels to operate at night?

Solar panels cannot operate at night. If we put self-adjusting mirrors on the near side of the moon, they could reflect sunlight back to the dark Earth, allowing solar panels to operate at night. How ...
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2answers
128 views

What would cause a moon to not orbit around the center of the planet that has it as its satellite?

There is no world or setting attached to this question but it does have me curious and might be useful for those who do actually want to build a world with this as a feature. Imagine a luna-like moon ...
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5answers
220 views

Secondary moon with negligible effect on planet

I'd like to know how to set up a secondary moon for a very much Earth-like planet that I could use for religious and time measurement purposes in a novel but that would not change general situation on ...
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10answers
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How would you build a harbor in a world with *intense* tides?

Long story short, my world is set on a habitable moon of a gas giant, and as a result has some very intense tides (about 5x those of Earth, averaging a few dozen foot difference between high and low ...
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2answers
124 views

Can life exist on a moon orbiting binary planets?

The situation i am trying to describe is a binary planet system where both planets are similarly sized, but without flora or fauna (basically an planet-sized moon). The planets are in the goldilocks ...
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3answers
750 views

Is “asteroid rain” on the Moon a feasible concept?

In my story, a group of creatures lives on the Moon. I know that microlith striking the Moon is fairly common, to the point that EVA suits are built to compensate for it, but I was planning to have a “...
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how do moons contribute to flooding [duplicate]

Okay so my planet is twice the size of earth(2 earths can fit inside) but has three celestial bodies(aka moons). does the size of the moons and planet contribute to flooding and the seas and ocean ...
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1answer
96 views

stability of two moons

Is there a good way to measure the orbital stability of two moons around a planet? Here I mean something like a mathematical constant or an equation that can approximate the stability of the orbits of ...
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3answers
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How to make an evil looking moon that runs naturally?

An omnipotent but not omniscient or omnibenevolent deity has decided that creating an evil looking moon that works according to natural law would be a great addition to their world's mythology. They ...
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1answer
126 views

How can a spike in Mana content lead to inconsistent birth rates?

The moon is a celestial object that rotates around the earth and is made up of warpstone, a solidified form of mana. This warpstone radiates its energy toward earth, bathing the planet with waves of ...
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4answers
503 views

Moon hit strong enough to put it in a slow spin?

I’m building a world nearly equal to earth; i need a catastrophic event that make the moon start spinning breaking the tidal lock, a really slow spin, like 500 years for a full spin. i thought about a ...
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2answers
175 views

Could one triple the moon’s mass without it colliding with earth if it was done slowly enough?

In my story, Earth is dead, and for religious reasons, humanity decides it needs to live on the Moon now. However, they want to triple the mass of the Moon to increase gravity to 5m/s or so. Assuming ...
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2answers
156 views

Light reflecting off a gas giant onto its moon

Okay, thanks to Ash, I know how to calculate the percent power of light hitting a planet at various angles. It is equal to cos(θ)2, where θ is the incident angle. I have a gas giant with a radius of ...
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5answers
241 views

Would Moons of a gas giant appear to phase when looking at them from another, tidally-locked Moon?

I'm designing a fantasy world on a tidally-locked moon of a gas giant. Because it's primarily a medieval fantasy set on the outward-facing side of the home moon, I'd like to keep units of time similar ...
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2answers
251 views

Does it ever make sense to create a lunar atmosphere?

Relevant to this question. NASA says the very thin vacuum like Lunar atmosphere has sodium and potassium Does creating a very thin vacuum like lunar atmosphere of the metal atoms leftover after mining ...
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2answers
121 views

Does the moon actually turn red during a lunar eclipse? [closed]

I feel dumb for asking this. I’m trying to make a scene on Earth’s moon where everything turns red, and I thought a good explanation for this would be a lunar eclipse, where the moon looks red from ...
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1answer
104 views

More Moons = Brighter Nights?

Now, firstly, I understand that the moon reflects a portion of sunlight onto the night's surface; So if a planet had multiple moons--say two or three, how would the additional celestial mirrors affect ...
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1answer
80 views

Rail road on the moon aka massdriver, encompassing the whole moon along the equator. How high are the bridges? How deep are the tunnels?

Mr. X strikes again with another moon plan and he was thinking - okay, it possible for a rover, on the Luna (earth's moon), to run on solar energy being permanently on the bright side with just 10mph ...
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7answers
7k views

How big can a moon be where you can physically jump out of its orbit, to its planet?

So, imagine a team of space marines, fighting some sort of space bug zombies on a planet's moon. Things are going pretty bad for them, and the last surviving protagonists are running for their lives. ...
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3answers
123 views

How much can the shape of the oceans affect the tides (on my earth-like planet)?

I have been concerned about the effect of tidal forces on my earth-like moon (0.7 earth masses and 0.88 earth radii), specifically given that because of the primary's mass (3 Jupiters, 1.04 Jupiter ...
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2answers
107 views

Could an organism exist in a vacuum just by temporarily “shutting off” and storing heat?

I’ve heard repeatedly that life in deep space is incredibly unrealistic, but I’ve had a (certainly scientifically stretched) idea for a race of ant-like creatures who live deep under the lunar surface ...
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2answers
135 views

How habitable and different would an habitable stagnant-lid (no tectonics) world be?

Recently I was informed of the possibility of having an habitable world lacking tectonic plates, specifically of something called heat-pipe tectonics. Which is essentially the same tectonic system ...
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0answers
107 views

Would my revised gas giant moon be habitable?

I have recently reworked the parameters of my habitable moon and I would really appreciate if you could tell me wether or not it would be hospitable to life for a sufficiently long period of time, ...
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3answers
131 views

How to make tides on my world less destructive?

I am currently developing an habitable moon oribiting a gas giant in a resonant orbit, however at the current time I am concerned about the effect of the gas giant on my world when it comes to tidal ...
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1answer
121 views

How bad would tides be on an habitable moon orbiting a gas giant in a 5:2 resonance (meaning not actual tidal locking)?

I have been working on an habitable moon (roughly 0.7 to 0.9 times the mass of the earth) orbiting a gas giant about 3 times the mass of jupiter and I have been thinking about a scenario in which I'd ...
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1answer
67 views

How big would my habitable moon's primary planet appear in the nightsky in these two situations?

How much bigger than earth's moon would my habitable moon's primary appear in the nightsky? And is there a way to calculate how bright it would be in lux when it is illuminated in full? Here is the ...
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3answers
113 views

Is this habitable moon formation scenario plausible?

My and my teams' works take place on a moon orbiting as giant about 3 times the mass of jupiter (possessing also a massive moon system) in a solar system with an F-star and be either the first, third ...
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1answer
180 views

Habitability of my world

For a big narrative project of mine I and my team developed an habitable moon that revolves around a gas giant in a star system with an F-star. I wanted to know what you think about it and if you ...
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1answer
65 views

What are the conditions required for a tidally locked world to be in orbital resonance?

I have been looking into the orbital mechanics of tidally locked worlds lately and saw some interesting things. Namely that would-be tidally locked moons/planets can have rotation periods that differ ...
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2answers
315 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 ...
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17answers
4k views

What would cause a moon to become much brighter only a few times a year?

I initially wanted to create a culture that used tides to tell the seasons, I'm sure I still can, but a question on here (I can no longer find it) made me wonder if I could set up a world where one of ...
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3answers
4k views

Would a moon with plantlife still give off (reflect) light?

The title basically says it all, but i will elaborate. Earth's moon light up the night sky by reflecting sunlight. But our moon is barren and made up of grey/white rock thus making it highly ...

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