# moons's questions - English 1answer

356 moons questions.

### 6 What kind of Gas Giant has a “safe zone” between the radiation from a star and the radiation from a gas giant planet?

This is a progression from my first question, here (if this is too similar to my original question, please let me know of a better way to address this, as I am not getting the answers I need on that ...

### 6 Is this planetary moon's calendar possible?

3 answers, 122 views science-based reality-check planets moons
I'm attempting to create a world that has very brutal, hard swinging weather and environments, leaving much of the planet desert-like. The world I've designed is a moon of a gas giant. The Parent ...

### 12 How can Ganymede have an Earth-like gravity without us having realized it?

Imagine a small primitive humanoid civilization that developed independently in caves under the surface of Ganymede. We can assume there's enough light that filters through the crystalline surface to ...

### -1 Characteristics of a habitable satellite planet [on hold]

2 answers, 98 views moons satellites
In Habitable Planets for Man, Stephen Dole establishes that a satellite planet in orbit around a massive gas giant, (like Jupiter's Titan, I guess) would be habitable for humans. What would it be ...

### 12 Can a habitable moon rely on the magnetosphere of its parent planet for radiation protection?

Science-based answers, please. Key points: the main concern is radiation protection for sustainability of human life (and accompanying plant and animal life ecosystems, whether earth-like or not). ...

### If Earth's Moon Were Ganymede-Like, Part I: Rotation

I know that in the past I posted questions on if specific bodies larger than the moon--Mars in one and Titan in another--but this series deals with questions regarding Earth's effects by a natural ...

### 6 Geostationary moon

1 answers, 166 views moons orbital-mechanics
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 ...

### 10 Could I use a series of magnetic asteroids to create a magnetic field for mars?

If I push a couple of magnetic asteroids into mars gravitational field, could they form an interlocking series of magnetic fields able to protect mars from solar winds? Size limits for asteroids is ...

### 13 Why did US government hide the discovery of an ancient civilisation on the moon? [closed]

5 answers, 1.655 views space government moons space-colonization
July 20, 1969, Neil Armstrong sets his foot on the moon surface. He declares : "That's one small step for [a] man, one giant leap for mankind". But what history books don't mention is that, as he ...

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

5 answers, 326 views planets moons atmosphere weather 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 (...

### 1 How big does a moon have to be to have the earth locked to it?

3 answers, 164 views planets physics moons tides
I would like a earth-moon system like Pluto-Charon (but with earth instead of Pluto) where both will be tidally locked to each other within something like 3 billion years (before complex life appears)....

### 14 How to explain life on a moon orbiting a non-habitable planet

8 answers, 1.401 views science-based moons
For story purposes, I am building a world where all life exists on the moon of a non-habitable planet (the moon is not tidally locked). How can I explain this in a convincing and mostly scientific way?...

### 5 Is it possible an ice line from pole to pole in a tidally locked Earth-like moon?

I am aware that there are a lot of answers explaining the fundamentals of a tidally locked "Earth-like" moon around a giant gas planet. For example this one: Habitable moon of a gas giant: working out ...

### 4 Conditions for an Ice Covered Moon to survive around a Terrestrial Planet

In my fictional setting, the planet that people live on, called "Nearth" has one smallish very dark moon close in, and a large moon farther off with a very high albedo. Nearth is exactly the same as ...

### 8 How to blanket moon with a permanent atmosphere?

3 answers, 422 views technology moons atmosphere colonization
There exist numerous theories on why the Moon lacks a layer of air if any, however the main culprits are gravity and the lack of Geo-dynamo simply put the Moon does not have the necessary mass nor the ...

### 3 Consequences of a two-mooned system losing the one closest to the planet?

1 answers, 69 views moons planetary-rings
I was thinking of adding rings to my planet and I wanted to give them a proper origin, so I thought about getting rid of the moon closest to the planet since I would still have one and it could make ...

### 1 Would the Earth with 4 moons still be habitable?

2 answers, 165 views physics earth-like moons
I'm currently writing about an Earth sized planet that is 33% water and has 4 moons all the same size as our moon. All moons are 243,000 miles from the planet's surface and the planet takes 392 days ...

### 4 How would I make a moon appear black in a night sky that has a nebula visible in it?

5 answers, 182 views moons eclipses nebula
So, I'm developing a world for my fantasy setting, but I thought it'd be neat if this particular world had a nebula visible in its night sky. (So, it might not be a nebula like the kind we have in ...

### 2 What should the size of my moons be?

3 answers, 149 views climate moons gravity alternate-worlds
(Not entirely sure if this is the right place to ask this but hopefully I'm right!) I'm writing a novel and the planet this novel takes place on has two, twin moons of approximately the same size. ...

### 2 Time, place and “look” on tidally locked planet?

3 answers, 526 views planets magic space moons
Working on a world for a fantasy novel. The planet is Earth-like and for all intents and purposes, tidally locked. It has a dark and light side and most human inhabitants live in a verdant twilight ...

### 2 Capturing a moon: Process reality check

3 answers, 133 views moons orbital-mechanics
Background: I have an icy moon on a collision course with my fantasy world. Mages on this world have the ability to slow the speed of the moon gradually. I want them to use this power to lock the moon ...

### 30 How big could an alien-made object on the far side of the moon become so that discovery still can only happen by accident?

6 answers, 7.132 views moons space-constructs
A great way to introduce advanced technology to a story is to have it be of extraterrestrial origin. E.g. have a spaceship crash on earth, or, like I was planning to, put a derelict spaceport on the ...

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

7 answers, 5.858 views hard-science gravity moons orbital-mechanics
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. ...

### 9 Lifetime of the Moon's moon

3 answers, 209 views space moons satellites
Imagine if the Moon had its own moon. A moon (likely an asteroid) that lies within the Moon's Hill Sphere. I have read elsewhere about the fate of such a moon. Over time due to the Moon being tidally ...

### 1 What happens if a small moon is held within a planet's Roche Limit?

1 answers, 91 views science-based moons planetary-rings
For story reasons, I need my mages to convert a moon on a collision course with their planet into a ring around the planet. The only thing they can do is hold the moon still. They can't do so ...

### 6 Which side of a tidally locked moon experiences higher radiation?

1 answers, 49 views science-based moons solar-system jupiter
Looking most specifically regarding the moons around Saturn, Jupiter, and Uranus. I've been unable to get a concrete answer on this through various sources. I've actually read several articles briefly ...

### 1 Added Difficulties of Space Flight on Gas Giant Moons?

2 answers, 111 views space-travel moons gas-giants
What additional difficulties might the inhabitants of a gas giant moon face when attempting to launch spacecraft beyond their moon's orbit, especially beyond the planetary system? I presume that they'...

### -1 Would a moon shatter if it collided with an unmovable barrier?

4 answers, 180 views moons collision
For story purposes, I'm trying to determine what would happen if a small moon-sized object crashed into an unmovable barrier surrounding a planet. My goal here is to eventually get a ring surrounding ...

### 1 Number of planets in a habitable zone with large moons [closed]

0 answers, 73 views planets earth-like moons
I recently had an idea, and it involved moons. Excluding gas giants, roughly what percentage of planets in the habitable zones of their stars would have large moons like Earth does, as opposed to Mars ...

### 3 Lunar cycles for a two moon planet (one of which is smaller and orbits the first moon)

2 answers, 122 views moons orbital-mechanics
My planet, is roughly as big as Earth, but has two moons. The first moon, Luna, is essentially the same as Earth's moon, but the second, much, much smaller moon, Selene, actually orbits Luna. Selene ...

### 5 What would the effect of three moons be on a planet?

2 answers, 963 views science-based physics moons
I'm working on creating a world with three moons, all with different sizes and different orbits. I'm wondering what effects this would have. How would the tides be affected, obviously, but also would ...

### 12 What would a planet with no moon look like?

8 answers, 3.749 views science-based planets moons
Consider a planet identical to Earth except that it has no moon. How long is the complete day-night cycle on this planet? I've heard that having no moon would speed up the planet's rotation, ...

### 10 A brighter moon that's harder to see

4 answers, 234 views science-based planets moons
In honour of the full moon an odd moon question for you all. The idea is to create a situation in which the inhabitants of a world believe utterly that the moon only exists at night. I'd also like to ...

### 3 Conjoined Planets?

4 answers, 551 views planets space moons
I was wondering if two bodies could be physically connected to each other such as the ones in the art I have attached. Is there any realism to it? Original art by Dave Melvin

### 14 How does one calculate the tidal heating of a satellite?

1 answers, 523 views planets physics hard-science moons
I've been searching for hours, and most formulas I can find use complex/imaginary numbers or variables that I don't know or can't find out (such as the imaginary part of the planet's love number, ...

### 10 Do moons determine the speeds at which tides move? Is there a limit to this speed?

6 answers, 305 views physics moons science ocean tides
I'm writing a short story that takes place on an imaginary planet that is 88% ocean. The planet has two moons and one continent that is regularly flooded under 500 to 1500 feet of water. The tides are ...

### 11 If you have multiple moons, do they behave in a standard way?

3 answers, 1.492 views moons orbital-mechanics
There are various questions about the stability of multiple moons, how they affect tides and so on, but I don't think this one has been covered here: If my planet has two moons, assuming they have ...

### 34 Can a radioactive moon affect life on a planet?

This question is meant as a reality check on this answer to The land grows evil and corrupted ... but why? Radioactive moon in a nearly geosynchronous orbit. It slowly kills or alters all life ...

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

2 answers, 146 views planets gravity moons orbital-mechanics
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 ...

### 5 Will be possible in the far future to create an artificial Moon for Earth and terraformed planets?

Will be possible in the far future to use megascale engineering to create an artificial hollow moon to give Earth a big moon in the sky like in billion years ago? Since it would be hollow, it would ...

### 40 Moon that changes color with phase

14 answers, 4.853 views science-based moons
In a world I am building, I would like to have the moon change color when seen from the planet's surface as it goes through its phases (e.g., the crescent after new moon is blood red, a quarter moon ...

### 21 Reality Check: Habitable moon around earth-like planet

For a complex world-building scenario I want a habitable moon orbiting a habitable earth-like planet. The habitable moon should allow for flora, fauna and landscape as similar to earth as possible. ...

### 2 Concise, formal way of describing a particular meridian of a moon

2 answers, 87 views geography moons map-making
Say I have a moon orbiting a planet. Due to tidal locking, if we model the moon as a sphere, there exists an axis which passes through the center of the moon which is always pointed toward the center ...

### 3 How long can a moon remain non-spherical, and what might it look like when full?

1 answers, 118 views planets moons astronomy orbital-mechanics
I'm trying to "build" a world in which the moon is always visible at night, and only at night, to the majority of areas on that world. I've been told that an L2 Legrange point could be a viable ...

### 4 Would a sun-blocking asteriod field be created if something big was to smash into the moon?

3 answers, 89 views science-based moons apocalypse asteroids
I'm wondering if it is plausible that a large asteroid (interstellar in origin? Or, perhaps launched from the Kuiper Belt by something big with a lot of gravity?) would be able to smash into Luna and ...

### 44 Can I use a trebuchet to launch satellites into space from a lunar colony?

I've got a lunar colony that struggles to obtain resources, so they're looking for ways to launch satellites into orbit without using up a bunch of rocket fuel. One plucky engineer has suggested ...

### 8 Predicting lunar eclipses with multiple moons

3 answers, 556 views science-based astronomy moons
I realize that creating worlds with multiple moons and/or suns is risky, but I'm toying with an idea to see where it goes. So, a planet has 3 moons. One is large like ours, the second is about half ...

### 9 Feasibility and consequences: the cosmic dance of twins habitable moons

1 answers, 153 views reality-check planets moons astronomy
I am aware of being a newbie in the field I am asking my question... please be kind and explain what I did wrong if I make a mistake. The idea from where the problem bloom I love worldbuilding. ...

### 12 Is it possible to have a Earth-like planet with a red moon, similar to the color of Mars?

6 answers, 2.515 views reality-check moons mars
With Mars' color coming from the iron oxide, is it possible for such a small body without an atmosphere to support that color?

### 21 Would a planet appear to wax and wane as observed from its moon?

5 answers, 3.536 views science-based planets space moons
Assuming that the observer is on the moon for a full lunar cycle, would the appearance of the planet wax and wane, would the moon's shadow occlude the planet during an eclipse while on the moon?