Questions tagged [moons]

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

Filter by
Sorted by
Tagged with
6 votes
3 answers
570 views

Questions about Moon Phases in Fantasy World

I'm currently running a campaign set in a world where the calendar is based on two things. The moon takes the entire year to cycle through its phases. So instead of full moon to full moon being a ...
3 votes
1 answer
135 views

Are high-density moons plausible beyond the frost line?

I have 3 gas giants in my system, 5.23, 10.97 and 15.14 AU respectively from a G3V star with .97 solar luminosity. Would the satellites of these worlds start higher density (rock-ice mix) and ...
  • 83
6 votes
2 answers
179 views

What would an eclipse with a translucent crystal moon look like?

What would an eclipse with a translucent crystal moon look like? In one of my worlds, a special moon orbits the planet — it's made of a translucent crystal, blocking only 80% of the incoming light. It'...
1 vote
1 answer
48 views

Could a substantial atmosphere protect a large moon from radiation belts like those seen in Jupiter's magnetosphere?

I'm imagining a moon with a mass of 0.25M (so 10 times larger than Ganymede), in Ganymede's position orbiting a gas giant like Jupiter. Maybe the atmosphere is anywhere from 0.1 - 1 bar. Would the ...
  • 775
0 votes
2 answers
93 views

Help me create a more believable artificial planet

Ok, I noticed some very intelligent answers on this platform and I would love your input on the planet for my book trilogy. I have been working on the blueprint, story structure, and characters for ...
  • 9
1 vote
1 answer
65 views

Tides on a planet with 5 moons? [duplicate]

What would be the effects on an earth-like planet with 5 moons, one the size of Earth's moon and the others approximately 1/10th its size? How massive would the tides be when they align?
  • 227
0 votes
0 answers
39 views

Effects of multiple moons on tides? [duplicate]

Hello I would like to ask what would be the effect of 0 - 1 - 2 - 3 moons on an earthlike planet? What would change? Consider may be a moon like our own and the other two of progressive smaller size? ...
  • 227
4 votes
1 answer
149 views

What if a portal is opened from The Surface of Lake Superior to The Surface of Kraken Mare on Titan?

Both ends of the Portal are 60 meters in diameter, and are halfway submerged into the lakes at each end. Each end of the portal is located at the point of the lake farthest from shore. Assume that the ...
5 votes
1 answer
74 views

Daily eclipses for a moon orbiting a gas giant?

I've dug into the idea of a habitable moon getting daily eclipses due to its gas giant getting in the way of the sun; but most examples I've found specify a tidally locked moon. I'm no astrophysicist ...
0 votes
1 answer
61 views

Various eclipses in a P-type binary star system?

Trying to make a world with a P-type binary star system, with a habitable planet orbiting around them, and one moon orbiting said planet. I am terrible with physics so I've been wondering if any of ...
  • 1
5 votes
4 answers
548 views

Colour of the sky on a moon with an thin artificial atmosphere

On a moon with an thin artificial atmosphere (think force field filled with Earth-like atmosphere), would the sky be a blue colour or have a blue tinge, or would the thinner layer of atmosphere (about ...
  • 187
1 vote
2 answers
95 views

How would a moon's rings affect tides?

Let's say an Earth-like terrestrial planet has a rocky moon, and that moon has small rings, probably from pulling apart an asteroid, comet, or something similar. From my personal research, I know it's ...
5 votes
5 answers
174 views

Can a Moon Shoot Spores?

I'm currently working on a world for a fantasy novel. For the sake of this discussion, we can assume it's low to no magic at all, and has no higher-intelligence interference, such as creator races, ...
3 votes
1 answer
73 views

How to place multiple small moons and one large moon in stable orbit around an earthlike planet?

Earth has one very large, spherical moon believed to have been formed by a giant impact. Mars has two small, sorta potato-ical moons believed to have been captured. Suppose an otherwise earthlike ...
  • 970
2 votes
2 answers
179 views

How do I make a moon into a world?

I am currently worldbuilding for a D&D campaign. And while many campaigns have worlds with one or more moons, I wanted to change it up by making this world the moon of a much larger world that is ...
3 votes
3 answers
131 views

A mainly barren world with two moons and a shared ring. Is it feasible?

I am creating this planet which is mainly barren and desert around the equator, but towards the poles there are huge mountains with glaciers and frosts. There is not much sea around. The inhabitants ...
4 votes
2 answers
94 views

What would happen on a binary planet if they captured a new moon into orbit?

I've been working on a world where the origin of the magic system is a catastrophic event that ripped the surface of the planet apart allowing magical energy from beneath the crust to escape to the ...
  • 41
3 votes
3 answers
884 views

Could a planet without an orbiting moon still be habitable to human life in at least one small pocket? [closed]

No moon likely means no tides. Does this make a planet half water, half land, or similar divisions? Do freshwater and saltwater have separation? Or would it just be a planet like ours, with delineated ...
5 votes
3 answers
215 views

Can two moons, moving at different velocities, periodically overtake each other and share an atmosphere?

Idea being, can two moons orbiting a large planet move at v_1 and v_1 + delta, but the distance between the two moons is small enough that when their positions along an axis periodically overlap they ...
4 votes
1 answer
261 views

Geopolitical ramifications of a faked Apollo 11 Moon landing being exposed?

Imagine it's an alternate July 20th, 1969. The American people and anybody with a television set watch as Neil Armstrong and Buzz Aldrin step out of the Apollo Lunar Module Eagle and become the first ...
  • 1,455
1 vote
0 answers
70 views

Why would someone or something want to steal the moon? [closed]

Because another life form, ET maybe wants it for his earth planet! A spaceship, like on Star Trek (next generation) would surely have a enough force or the capabilites to trip up the moon? ...
1 vote
1 answer
68 views

Short and Long Term affects of another Moon [closed]

What would the Short Term effects be on the earth is another heavenly body, similar in size of our current moon were to suddenly appear in orbit? I would assume large tidal activity, perhaps even ...
6 votes
3 answers
204 views

how plausible is this exomoon?

(this is doublet of my previous question, so I did a little improvement on it) -my exomoon is around size of venus, but a little bit smaller. is very windy, so windy in fact filter feeders thrives in ...
  • 1,742
3 votes
3 answers
183 views

Plausibility check : an habitable exomoon

Is this moon plausible this moon is a little bit smaller than our moon it has thick atmosphere. so much so that floating algae thrive in the wind. the moon is not too close to its planet nor it's ...
  • 1,742
3 votes
2 answers
98 views

Ore/mineral hotspots in planetary rings

In my setting, there is a small, rocky ring system surrounding an earth-like habitable planet. This ring was formed relatively recently (approx. 50 million years ago) from a small moon with a Moon-...
  • 1,165
4 votes
4 answers
194 views

What are the odds of a binary solar eclipse?

I'm currently creating my own binary star system which includes a circumbinary planet that has two moons. For simplicity's sake, the stars, planet, and moons are comparable in size to our own Sun, ...
  • 43
4 votes
1 answer
174 views

Is terraforming of Europa going to make Jovian system much more dangerous?

I’ve terraformed Europa. The now oceanic moon with floating islands was given thick atmosphere (pressure, thickness and composition to be established later, but I’m aiming at something thick, murky ...
  • 616
4 votes
3 answers
195 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 ...
  • 2,193
5 votes
5 answers
197 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 ...
  • 700
5 votes
5 answers
190 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 ...
  • 171
4 votes
5 answers
234 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 ...
  • 3,480
6 votes
6 answers
3k views

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 ...
7 votes
6 answers
567 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 ...
  • 181
3 votes
4 answers
309 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 ...
  • 1,453
6 votes
3 answers
158 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 ...
  • 1,453
6 votes
2 answers
158 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 ...
  • 5,477
6 votes
6 answers
2k views

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 ...
  • 1,374
4 votes
1 answer
257 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. ...
4 votes
2 answers
156 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 ...
5 votes
3 answers
751 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 “...
  • 1,802
25 votes
10 answers
7k views

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 ...
5 votes
3 answers
1k views

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 ...
  • 26.7k
1 vote
1 answer
123 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 ...
  • 619
6 votes
4 answers
514 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 ...
-1 votes
1 answer
133 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 ...
  • 38.3k
0 votes
2 answers
181 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 ...
0 votes
0 answers
25 views

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 ...
2 votes
5 answers
287 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 ...
  • 23
1 vote
2 answers
239 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 ...
2 votes
1 answer
125 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 ...
  • 21

1
2 3 4 5
13