Questions tagged [moons]

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

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6
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4answers
227 views

A moon that becomes or appears blue from the surface of its host planet once every ten years on the same date?

This is really just a curiosity question: I wrote a fantasy novel in which the moon appears blue once every ten years on roughly the same date without fail. If anyone asked me why the moon of my world ...
6
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3answers
688 views

Could a Titan-like moon orbit a terrestrial planet?

Could a terrestrial planet (1x diameter and mass up to 1.5x diameter and mass) hold a Titan-like (dense atmosphere, relatively large size, weather) realistically in its orbit? If not, how large would ...
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8answers
381 views

Could a planet with many moons see a different moon each night?

This is just an idea I have been toying with. Taking Earth as an example with 7 days in a week, my idea would that there would be 7 moons in orbit around the planet. They would not necessarily share ...
6
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5answers
269 views

How to get rid of moon stations?

I have a story where a powerful outside force killed (next to) all humans on earth some decades ago. The way I want to build it is that it required that the human outposts on the moon to die as well. ...
6
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4answers
502 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 ...
6
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4answers
730 views

How to fragment a moon to form a ring around a planet

Given a planet about the size of Earth, and a moon the Size of the Moon, how could one destroy the moon without flinging the fragments onto the surface of the planet or into outer space? How can one ...
6
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3answers
129 views

Anchoring a Deimos base

Some astronauts have just arrived in Mars orbit! They're fixing to set up a small refueling station/outpost on Deimos. One problem, how might they keep their small habitat and associated structures ...
6
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3answers
182 views

Can a moon cycle accelerate periodically?

I've been looking for information on this, but I haven't come upon an answer that could actually help me figure this out: Imagine a planet, inhabited by somewhat "human" beings, that has one sun-like ...
6
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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 ...
6
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2answers
342 views

Multiple moons but only one of them is tidally locked to its planet?

A habitable planet with multiple moons, only one of which is tidally locked to the planet: is this general scenario possible? I understand that tidal locking takes a very long time to happen. So ...
6
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3answers
352 views

How could I make the moon appear larger?

In many series (Elder scrolls for example) they have a huge moon. It is rare though when they explain how it can be larger. There are only two choices both of which couldn't work; One is to bring ...
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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 ...
6
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2answers
428 views

What would happen on the surface of a terrestrial planet captured by a gas giant?

So, from what I've read of Porter & Grundy (2011), most gas giant planets orbiting within their star's habitable zones are thought to have migrated there from further out in the solar system, with ...
6
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1answer
308 views

What effects would a massive amount of water vapor in the atmosphere have on an alien planet

I am an aspiring science-fiction novelist. I am experimenting with a world I’m trying to create and I wanted a couple of expert opinions on Atmospheric composition; 53% Nitrogen 27% Oxygen 3% Xenon ...
6
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1answer
748 views

Timekeeping Systems on a Habitable Moon

Ok, this is take two. Hopefully this is specific enough. I have a link to the original question here. And for those of you eager to see my sources for this, I'll link two videos here from the ...
6
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2answers
136 views

Effects on human history, culture and scientific development of a rotating moon scenario

Imagine a scenario where the moon is not tidally locked with one side facing the earth but where it is able to rotate about its own axis. This could be due to a larger distance from earth or a mildly ...
6
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2answers
241 views

What conditions to make this habitable moon plausible?

I'm trying to figure out how to make this gas giant moon habitable. Here are the factors involved: Moon is sub-temperate, mountainous with a nitrogen-oxygen atmosphere, with the planet being mainly ...
6
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4answers
519 views

Almost tidally locked to moon and the tides it would create

I have a world with a moon, much like Earth and the Moon, except that the planet is almost tidally locked to the moon. The moon therefore appears to move only very slowly through the sky, and takes, ...
6
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1answer
656 views

If the Moon Titan Orbits Earth

Long ago, I made a post with a scenario on how planet Earth would be affected if our moon were the size of Mars. But I've decided that it be more reasonable if our moon were closer in size to Titan, ...
6
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3answers
256 views

Once you've calculated the tidal heating of your moon, how do you calculate the surface temperature?

Let's say you've calculated the tidal heating of a moon in Watts using the method described in How does one calculate the tidal heating of a satellite?, how do you then convert this to surface ...
6
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4answers
161 views

Could some natural process on a moon do enough stationkeeping to sustain an impossible orbit?

I have several stories where I've wanted a moon in some weird orbit that is not allowed by orbital mechanics. In the past, I've had to change stories to bow to physics. Today, I had a thought while ...
6
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2answers
76 views

How would gravity on a moon be affected based on orientation relative to its parent planet?

I am writing a sci-fi novel in which humanity has colonized a majority of the solar system, and a few minor colonies on nearby stars. Although calculating mass and gravity on individual planets and ...
6
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1answer
120 views

Defining the perceived appearance of a moon from a planetary surface

I have a homebrew setting with a moon that has some specific features orbiting an Earth sized planet, and I'm trying to find out how these features would affect how the moon looks from the surface of ...
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5answers
566 views

If our moon had an atmosphere, could it have seasons?

Because our moon is tidally locked with Earth, then the same half always faces the Earth regardless of where the Moon is in its orbit. As such, would a tidally locked satellite such as our moon (...
6
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1answer
239 views

Geostationary moon

My planet is very Earth-like with a day length of 26.87h. The moon has a radius of about 1550km, a mass of $5.2\times10^{22}$ kg and orbit 45500 km from the center of planet. My scenario is that the ...
6
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1answer
264 views

The Earth and Moon resolidify under a bluer star, their outer layers evaporated and burned away. What do they look like now?

(This is the third in a series of questions, starting with Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands? and How soon does the Earth's ...
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1answer
114 views

What would the effects be on a planet whose moon orbits at a speed just faster than a geosynchronous orbit, so there are more months than days?

Would anyone be able to check some math/ let me know if I'm thinking of this the correct way? I had an idea of the moon appearing basically stationary in the sky, but in fact it orbits just faster ...
6
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1answer
415 views

Does my plot point centered around eclipses make sense?

My main antagonist is an infant Great One that's been imprisoned below the Moon's surface and I want its influence and physical form to have a weakness to direct sunlight which, I think, gives me a ...
6
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1answer
142 views

How do you determine placement of multiple lunar bodies in the night sky?

One of the worlds I’m building has three moons in 1:2:4 resonance, with the full moons syncing up once a cycle, meaning all three are full at different times but at the same time when the moon with ...
6
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1answer
147 views

Balancing Water Vapor and Temperature for Global Cloud Layer

BACKGROUND: I have been working on a game called Rise: The Vieneo Province. Vieneo is a terrestrial moon (all details can be found here) but we have an atmospheric composition we arrived on from ...
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1answer
398 views

Could an impact crater make a world habitable?

For most of us, meteors are by far the ultimate planet killers. All it takes is one direct hit to suddenly wipe all life from the face of a world. But, rather than taking life away from a planet, what ...
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3answers
151 views

Could ocean and wind currents form on a tidally heated body

The moon is similar to earth but orbits around a gas giant, the sun has ended its life cycle and so the only energy received on the moon comes from tidal interactions heating its core. On earth and ...
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1answer
120 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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2answers
361 views

Spinning up the Moon: does it survive the event?

The year is 2xxx. A large asteroid is spotted on a collision course with Earth. The more time it passes, the more it is clear that the impact cannot be avoided. But when most of humanity is starting ...
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3answers
993 views

Could over-colonization throw our moon out of orbit?

I've read this question, but most of its answers don't seem to apply to my question directly other than possibly this one, which suggests that in order to change a planet's orbit, you would have to ...
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4answers
2k views

What would the night sky look like from Luna (Earth's moon)?

Prima walked out to the observatory's main deck. There, as she had expected, Secunda was sitting in the grass, looking up at the stars. "Pretty, isn't it?" said Secunda, as she craned her neck ...
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5answers
981 views

Perils of having a moon consisting of valuable material

In the 1960s we were disappointed to find that the moon is a pile of dust and rubble with no easily accessible valuable materials. Well, we kind of knew it before that, but we weren't sure. Anyway, ...
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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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8answers
696 views

What benefits would having a second moon bring for humanity?

In my story, Earth follows an alternate history where this civilization has reached the same level of development as us, today. Assuming that this civilization can lift a second moon half the size of ...
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4answers
314 views

The long-term effects of the Moon being in contact with the Earth?

In these two questions, https://physics.stackexchange.com/questions/232141/how-much-force-would-be-required-to-destabilize-the-moons-orbit-enough-for-it-to and https://physics.stackexchange.com/...
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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
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 ...
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3answers
205 views

Moon composed of optical material

I'm curious about the impact of having a moon composed primarily of a material with a strong optical property: calcite, diamond, glass or something else similar. Would the traditional spherical shape ...
5
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3answers
434 views

How fast could our modern-day world build a rocket to the moon if we threw our resources at it?

For some reason, all the nations in the world have banded together. Their goal? Go to the Moon. Their budget? As much as the planet and humans can throw at it. How fast could we build a reliable and ...
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4answers
324 views

Maximizing Nuclear Detonation Effects against a Lunar Colony

Nuke the Moon! Earth's had it with the Moon colony's insubordination and independence efforts. The situation has escalated to a hot war. The W90 nuclear warhead is nearing the end of development. ...
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3answers
589 views

A double-bright Moon and plant growth

It's Earth and the moon with all parameters as they are in real life with one exception, the moon is twice as reflective as usual. Instead of an albedo of 0.12, the moon has an albedo of 0.24. This ...
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2answers
221 views

Creating "Sunfall" on the moon of a gas giant

I'm attempting to figure out the orbital physics of a system that has a habitable body that has intense periods of waxing and waning sunlight. I've come to the assumption that the best body for this ...
5
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3answers
314 views

How to get rid of the rainforest for a desert moon with only habitable poles?

I wanna build a habitable desertworld which is a gas giant moon. The desired and already semi-fixed parameters are: mass between 0.4 and 0.25 Earth-masses only 10 to 30 percent global ocean cover, ...
5
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6answers
681 views

What do I bear in mind, creating an earth-like world with TWO moons?

I'm writing a series that takes place on an earth-like planet, and I really want there to be two moons, specifically. I want there to be tides, but I don't want them to be so intense that they ...
5
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3answers
1k views

Naturally making a gas giant moon habitable

Let's say that in my planetary system there is a gas giant around the size and distance from the Sun as Jupiter. I need the planet to be similar enough to earth to be able to be inhabited natural by ...

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