Questions tagged [gas-giants]

For questions relating to gas giants: large planets composed of gases (usually mostly hydrogen and helium).

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How Large Would A Gas Giant Appear To Be To The Inhabitants Of An Earth-like Moon Orbiting it? [duplicate]

How large would a gas giant realistically appear to be on an Earth-like moon? I think a movie or two has portrayed them as very large, but that's an exaggeration, right? Depending on the size and ...
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1answer
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Would An Earth-Like Moon Be Tidally Locked? [duplicate]

Could a moon of similar size to the Earth orbiting a gas giant be tidally locked compared to its host planet? What effect would that have on the moon, especially the biosphere?
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How do I design the solar transit of a hot Jupiter?

BACKGROUND The world I'm designing currently has a gas giant of the type known as a hot Jupiter orbiting close to the sun and causing solar flares. I would like the inhabitants of my Earth-like world ...
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2answers
206 views

Is this gas giant possible?

I want to create a gas giant planet. The parameters I would like for it to have are: It should have a large layer of gas within its atmosphere that living creatures including humans can survive and ...
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7answers
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Could you float a boat on a gas giant?

A futuristic entrepreneur wants to start a cruise line company and needs to build a cruise ship that will not only float on a gas giant, but be habitable throughout a 7 day trip (for the uber-rich of ...
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3answers
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How can perpetually-gliding lifeforms develop space travel?

Malgrovian gliders inhabit the middle layers of the atmosphere of Malgrov, a gas dwarf. They spend most of their life gliding, preying on giant balloon-like floating lifeforms. When they get older, ...
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1answer
110 views

Building a drone for gas giant flight: Lightning considerations

A previous question's answer established that naturally occurring positrons could be gathered through positron-emitting isotopes. I've started looking into means that these isotopes could be gathered ...
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3answers
945 views

Life on a rogue planet

I am imagining a special ecosystem on a rogue planet (a planet that wanders throughout space without orbiting a star or other heavenly object) but I would need your help to fill in the gaps and ...
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3answers
829 views

Details needed for day cycle of lunar world orbiting a gas giant

I'm writing a science fiction story set on a moon orbiting a gas giant. I want to understand how the world's day night cycle would appear from its surface and how the world might be affected by this ...
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2answers
132 views

How to determine the temperature of an Earth-like planet with two major heat sources?

Ghyesh is an Earth-like habitable moon that orbits a gas giant in a system with a sun significantly larger and hotter than Earth's. Both the gas giant and the sun emit an equal level of heat to the ...
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2answers
722 views

Is this habitable moon possible?

I've already asked a similar question but i'd like more details. This moon would be orbiting around a saturn like planet without rings. The host planet would be located in the habitable zone, ...
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5answers
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Effects of regular prolonged eclipses on environment

What would be the effect on climate on an Earth-like moon of a gas giant, which experienced regular ("monthly") total solar eclipses (by its gas giant parent) lasting approx. 40 hours. I'm trying to ...
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Captured Earth-Like Moons around Gas Giants

Is there a limit (and if so, what is it) to the size (mass) of terrestrial planet that could be "captured" as a moon by a migrating gas giant? I'm writing a novel where a colony ship crashes on such ...
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Smallest Black Hole to 'heat' a Gas Giant

So I want a large power source to heat my new real estate on the Jovian moons. I create a micro black hole (MBH), maybe a few kg, maybe more and drop it into Jupiter. I expect the following to happen [...
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1answer
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Dropping a Micro Black Hole into a Gas Giant [duplicate]

Update: Joe Kissling raised some important objections in the comments - I'll play about a bit with black hole masses and update my question accordingly - any answer along similar lines might be ...
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9answers
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What could cause a difference in coloration between the hemispheres of a gas giant?

Would it be possible for a gas giant to have differently colored hemispheres? E.g. the northern hemisphere appearing blue when looked at, while the southern hemisphere would appear brown? (or any ...
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1answer
601 views

Conditions for human life in a Jupiter-like system

I was wondering about a setting where a moon orbiting a gas giant can sustain human life on its surface, i.e. with nearly identical conditions compared to Earth (e.g. size, gravity, mean temperature, ...
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336 views

How can you set up a mine for the lower layers of the gas giants?

So in the story I'm writing, mankind has advanced farther in the next few decades than we have over the past couple thousand years. Colonization has allowed us to settle the planets, and the FTL drive ...
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Earth-like Moon around the Gas Giant. Eclipse length?

Worldbuilder in dire need! I'm trying to figure out the eclipse length of a habitable Earth-like moon that is rotating around a gas giant. The story that I work on is centered on the Earth-like moon, ...
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4answers
318 views

Could this work? How to? Terraformed gas-giant

I have an idea for a scify/lost technology world, that I would like to check the plausibility of. What I want A terran world of large size. The crust of the world is thin, and hostile gas-organisms ...
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3answers
533 views

Can life arise on a brown dwarf?

Brown dwarfs are celestial bodies in the gray area between planet and star. They're huge, gaseous, hot compared to planets, and come in all different kinds. (1) Is it possible for life to develop in ...
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1answer
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How much space is needed to feed 30,000 people? [duplicate]

also how much space is needed for 30,000 people? I need to build an orbiter that will feed and make sure 30,000 people survive on Jupiter.
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1answer
197 views

Multiple moons orbiting a gas giant: How would I calculate how long it appears for a closer moon to orbit the planet from a further-out moon?

I have a habitable moon orbiting a gas giant, and there is another moon orbiting the planet on a closer orbit. The cultures on the near-side of the further, habitable moon use the transit of the ...
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2answers
920 views

Earth-like moons orbiting around a gas giant

I have a world idea (and definitely not the only one with such an idea in which the main location is a moon of a gas giant, that has life like on Earth. What are the effects of the presence of the ...
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1answer
378 views

Can I have my blue/green habitable Gas Giant? [duplicate]

For my current Eclipse Phase campaign/Fan Fiction I set up a "habitable" Gas Giant, by habitable I mean, that there is a layer in its atmosphere, where 1 bar of pressure and a temperature of ca. 283 K ...
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1answer
638 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 ...
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1answer
312 views

How do calendar systems arise? How would this affect a civilization's time-keeping if originating on the moon of a gas giant? [closed]

So I understand how gas giants and their many, many moons operate, and I can make educated guesses about how Earth-sized satellites could orbit a large gas giant, as well as how gas giants can be in ...
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2answers
264 views

Planetary system with a solar eclipse every day - need help designing

I have a habitable moon orbiting a gas giant. The moon is not tidally locked with the gas giant. The orbital plane of the moon around the gas giant is the same as the orbital plane of the gas giant ...
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3answers
480 views

How to create a “twilight” world around a red dwarf star

I'm looking to build a "twilight" world, where days are like twilight even when the sky is clear and nights are...very dark. Cloud cover might be able to turn day to an early night. I do envision a ...
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5answers
675 views

Is it possible to transform Jupiter into micro-star?

For fusion to occur we need extremely high temperature at the core to overcome coulomb barrier or for the nucleus to be close enough to tunnel into each other. Is it possible for type 2 civilization ...
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11answers
6k views

What would be the first thing humans would mine on Jupiter?

Jupiter is a terrible place to be, but for a number of artistic reasons, I'd like to have my story take place there and only there. "Mining", or resource extraction by any other name, is the usual ...
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2answers
198 views

Could a gas giant have a stable orbit within the asteroid belt?

By a stable orbit I mean not getting ejected by the other planets or ejecting them, Let's create a scenario where Neptune occupies an orbit in the asteroid belt at 2.76 AU, Ceres average distance from ...
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271 views

Consequences of having a gas giant as a neighbour instead of Mars

Assuming we had a gas giant instead of Mars in our planetary system. Everything else stays the same. Which long-term and short-term consequences for life on Earth would I have to take into account?
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4answers
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Maximum amount of habitable moons possible around this Jovian planet?

The gas giant has a mass of about 2.13 Jupiter masses in the habitable zone of a Sun like star 0.981 Sol masses, all the moons will need at least >0.12 percent of Earth's mass and a Mars like density ...
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3answers
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Is it possible for life to exist on the core of a gas planet?

I was thinking of writing a story and had the idea of having a society exist on the core of a gas planet. The core would be similar to earth with a breathable atmosphere similar to ours above it but ...
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2answers
121 views

Suspended rocks in a gas giant's cloud layer?

I was watching Knights of Sidonia a while back, and one of the episodes in season 2 takes place on a gas giant. Throughout the episode, countless large boulders, each probably larger than a city block,...
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How much oxygen is too much? [duplicate]

A little while ago, I asked a question about how habitable a gas planet I created could be. Although I expected that the floating cities idea wasn't the most solid, I was surprised that one of the ...
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520 views

Can this unique planet be colonized?

In the story I'm writing, a gas dwarf (named Eden) is discovered in a triple star system. Its atmosphere is mainly oxygen and water based, and its gravity is slightly higher than Earth's. Unlike our ...
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4answers
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How to build a “cloud city” in a gas giant?

Another question made me remember this. Consider a sizable base (building, station) in the atmosphere of a gas giant planet. It should hold a staff of a couple hundred, with supplies and scientific ...
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6answers
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Is it possible to orbit inside a gas giant?

When we talk about orbits we often imagine a ship or station orbiting a planet outside its atmosphere. Is it possible a ship could go into orbit inside its atmosphere (perhaps to hide from other ...
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0answers
148 views

Could a gas giant the size of Neptune or Uranus harbor intelligent life? [closed]

If possible, what are some ways they could create tools? Assuming the gas giant is in the habitable zone and has a lot of water vapor in its atmosphere, receiving the same amount of sunlight Earth ...
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2answers
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Can “heavier” elements be produced in a gas giant? [closed]

Is it possible for gas giants to fuse elements such as hydrogen and helium into heavier elements without collecting it from space? Obviously, the gas giant cannot perform supernova nucleosynthesis, ...
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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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2answers
851 views

Day and night cycles of a gas giant moon

Let's say that a gas giant (around the same size and distance from the sun as Jupiter) has a moon that supports life. The moon is around the size of Mercury (if this is too large please let me know). ...
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2answers
249 views

Reign of the Gas Titans

In this alternate universe, we still have the gas giants of Jupiter, Saturn, Uranus and Neptune. However, each planet has its mass increased $3.5$ times. How would this change affect the gravity of ...
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3answers
616 views

What is required to make watery, blue-white colored jovian planet at habitable zone of a star

Background In my story, HD 28185 star system harbors life. One of them is a jovian HD 28185 d (Subralis), located around 1AU of this sun-like star. In-universe, Subralis is approximately 132,000 ...
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How can I get a habitable moon of a gas giant to cool once it is in the planet's shadow?

I'm currently heavily revising a story which is largely set on a habitable but not exactly hospitable moon of a gas giant orbiting on the outer edge (or just beyond) of the habitable zone around a Sun-...
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1answer
328 views

What gravitational impact would moving Jupiter to the inner solar system have on the outer?

Based on my recent series of questions: here and here. The giant known as Jupiter has moved to the inner Solar System and Earth and Mars have become it's moons (despite all the odds). The moon of the ...
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2answers
1k views

What would happen to the moon if the Earth was captured by Jupiter?

See this question for further details I also know how unlikely this situation is, so please refrain. From telling me "it won't happen." Jupiter is sent on a spiral into the inner Solar System. Both ...
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1answer
303 views

What if Jupiter's rotational period was equal to that of the Earth?

I was amazed when I learned that Jupiter rotates on its axis once in only 9.8 Earth hours. (Yes, you can call me uneducated!) What if the rotation period was 24 Earth hours? What would change in the ...