Questions tagged [gas-giants]

Questions regarding massive planets composed of layers of gases, such as hydrogen and helium, surrounding a solid/liquid core.

Filter by
Sorted by
Tagged with
-4
votes
1answer
74 views

Can air/gas be slowed down by friction [closed]

Can wind/air that is moving at average speeds be slowed down by the cause of Friction? Also, Can Air bubbles in water be slowed down because of Friction? Please cite your sources.
6
votes
0answers
100 views

If the fifth gas giant in the early Solar System was completely ejected, where would it be now?

I've read about the possible 5th gas giant in the Solar System, and about its ejection. However, I have not seen anything about its potential whereabouts. Assume this gas giant (let's call it G5) was ...
0
votes
1answer
76 views

Could a star become a planet?

Could a star become a planet? I am asking this because the gas giants are ¨Failed Stars¨ and they are classified as planets in our solar system.
25
votes
3answers
4k views

Why can't stars be multicolored like gas giants?

Gas giants like Jupiter and Saturn have bands of different colors in their atmosphere. These are due to the rotation of the planets. Stars rotate too, so why do most stars have patches/blotches of ...
6
votes
1answer
247 views

Why do the solar system planets go rock-gas-ice instead of rock-ice-gas when moving away from the sun?

The sun and the solar wind seem to do a good job of fractionating lighter materials to the outer solar system and leaving heavier materials in the inner solar system. So we end up with rocky/metallic ...
1
vote
1answer
98 views

Life cycle of a gas planet?

I am interested in learning more about the (simplified) life cycle of gas planets which are not brown dwarfs (meaning less than 13 Jupiter masses). It obviously starts off with their creation within a ...
-1
votes
1answer
56 views

Why are gas giants (Jovian planets) spherical in shape? [duplicate]

If the core of the gas giant was square for instance, would the planet be square too?
3
votes
2answers
89 views

How to calculate the frequency of a gas giant eclipsing the sun from a moon?

Say you have a moon around a gas giant which goes around a star. If the moon has an inclination of around 0° relative to the gas giant's orbit, the gas giant will eclipse the star every orbit of the ...
1
vote
0answers
35 views

Updrafts on Gas Giants

Gas giants put out a fair amount of heat from gravitational collapse, so there's bound to be quite a bit of upward moving winds. If Carl Sagan's idea about aerial ecologies pans out, could larger ...
1
vote
0answers
19 views

Qualities of gas giant atmospheres at a density of 1 gram per cubic centimeter

At what depth in the atmospheres of the gas giants does the density of their atmospheres equal 1 gram per cubic centimeter? What is the pressure and temperature at these depths? Are the radiations ...
3
votes
1answer
39 views

What is the difference between aurorae and electroglow?

One of the discoveries of Voyager 2 at Uranus was a phenomenon called "electroglow", which as I understand it is related to charged particles interacting with the atmosphere that cause the ...
6
votes
1answer
234 views

What's the critical mass of a rocky planet before its gravity traps enough gas in its atmosphere to start becoming a gassy planet

Looking at the latest theories, I've noticed that most rocky planets are below a certain mass range. I speculate that maybe the way gas giants and gas dwarfs form is a rocky planet during the ...
22
votes
2answers
2k views

Where do we define the “surface” of a gas planet?

Since gas giant consist of most gas components, where do we establish their "surface"? My take is basically to take the limit in which all light is opaque. For example, in this photo: The ...
5
votes
1answer
122 views

Are there other planetary systems where gas giants are on the inside to rocky planet orbits?

I understand that formation theories for gas giants suggest they should be born further away where there is more gas for them to monopolize vs the sun, and then to form Hot Jupiters they need to ...
12
votes
1answer
2k views

Why do gas giants have clearly delineated surfaces, whereas the Earth's atmosphere fades into space?

I've just seen this Forbes article. Why do gas giants appear to have clearly delineated surfaces, whereas the Earth's atmosphere fades into space? Is it just a matter of scale? Or is there some ...
1
vote
0answers
73 views

Satellite grids around other planets [closed]

We send a lot of rovers to Mars, as interesting as the planet could possibly be. But why are we not putting satellite grids around planets that could transmit superficial probe data at the very least?...
0
votes
1answer
120 views

What is the gaseous-to-rocky ratio of exoplanets?

Around the Sun, there are as many gaseous planets (Jupiter, Saturn, Uranus and Neptune) as there are rocky planets (Mercury, Venus, Earth and Mars). Do other stars have similar gaseous-to-rocky ...
7
votes
1answer
599 views

Is there a clear-cut difference between rocky and gaseous planets?

A gas giant planet is large enough that it retains a lot of hydrogen and helium. A rocky planet is one with a solid surface. That's the rule of thumb to distinguish between the rocky and gaseous ...
0
votes
1answer
75 views

Would it be possible for life found on moon of rogue planet

I have heard that there are at least three Basic requirement for life exist in the universe, they are: Source of Energy Complex chemistry (including solvent/medium for chemical reaction) Protection ...
2
votes
2answers
169 views

Can a dying, swelling, star be rejuvinated by enveloping orbiting gas giants?

Many hot jupiter type exoplanets have been found, orbiting near their parent stars. At the end of a stars life, they swell up and sometimes envelop closely orbiting bodies. Combine these effects and ...
15
votes
2answers
520 views

Characteristics of the first planets in the Universe?

What would have the very first planets looked like, based on their most likely chemical compositions? For example: Were they mostly grey gas giants with atmospheres of hydrogen and helium, ...
1
vote
0answers
55 views

Is there any possibility that a gas planet turns into a star [duplicate]

Since the sun is made of one of elements hydrogen Why Saturn and jupiter doesnt turn into a star since they have a elements of hydrogen ?
2
votes
1answer
150 views

Are gas giants actually rare?

Kepler data suggests that the vast majority of planets are smaller than 4 Earth radii, with larger planets quickly becoming vanishingly scarce. Yet somehow, our own solar system harbours not just one, ...
1
vote
0answers
58 views

What would happen to the atmosphere of a rogue jovian planet?

Let's say we have a gas giant composed primarily of hydrogen and hydrogen-rich molecules that is ejected from its star system. As this planet embarks on its potentially infinite journey out into the ...
1
vote
2answers
81 views

Is there a term for asteroseismology as applied to giant planets?

Giant planets such as Jupiter have oscillations which enable analyses using the techniques of asteroseismology, for example Gaulme et al. (2011) detected global modes on Jupiter via radial velocity ...
0
votes
1answer
155 views

Birth of the Gas Giant Planets?

How does a gas giant planet form like Saturn and Jupiter, and why just gas? Why didn't they form any solid surface?
0
votes
1answer
112 views

Can we get the gas compositions from a gas planets? [closed]

Is it possible to get some gases like hydrogen from gas planets (Saturn, Jupiter, Uranus or Neptune)?
42
votes
1answer
5k views

Why does the Sun have different day lengths, but not the gas giants?

The Sun's rotation period varies from about 25 days at the equator to about 38 days at the poles. As I understand it, this is because the Sun is not solid, and because of the way centripetal force ...
6
votes
1answer
148 views

Aren't there any rock or similar firm material on/in the gas giant planets?

Aren't there any rock or similar firm material on/in the gas giant planets? What happens if a rock asteroid hits one of these planets? Shouldn't the rock accumulate in the center of the planet due to ...
3
votes
1answer
116 views

Gas Giant temperatures

Sudarsky's gas giant classification predicts the visual appearance of gas giant planets based on their temperatures. But what determines their temperatures in the first place? Is it just the ...
4
votes
1answer
76 views

Largest non-hot gas giants

Excluding 'fluffy' or 'puffy' gas giants that are 'inflated by heat from their stars, what is the maximum radius of a gas giant planet. I keep reading things like "...Jupiter is 'about' as big as ...
4
votes
1answer
295 views

Warm jupiter vs hot jupiter, fluffyness

If Jupiter was orbiting at 1AU, replacing Earth, but everything else in the solar system remained as it is currently, how much would the increased heat from the sun increase Jupiter's radius? In ...
2
votes
1answer
108 views

Terminology question: gas giant vs gas planet

While not exactly the most exciting question, I'm wondering: is there any real, semantic difference between a gas planet and gas giant, or are the two terms used interchangeably by most in popular ...
2
votes
2answers
127 views

What percentage of gas giant exoplanets are in the habitable zone?

Approximately what percent of exoplanet gas giants discovered so far are in the habitable zones of their stars? I hear that most of them are "Hot Jupiters", orbiting so close to their stars that the ...
10
votes
2answers
2k views

Why does each and every planet of our solar system have an unique axial tilt angle?

Why do planets have an axial tilt? From the above image we can see that each planet's axial tilt angle varies and differs from the others. What was the cause of this, was this from the beginning of ...
1
vote
1answer
125 views

Where do gas giants end up?

I want to create a semi realistic star system generator but I am not sure where to "put in" gas giants. My guess is they can form pretty much anywhere within the sphere of influence of a star at the ...
7
votes
3answers
6k views

Fate of Jupiter when our sun dies

Five billion years from now, the sun will have grown into a red giant star, more than a hundred times larger than its current size. While this metamorphosis into the giant star will change the solar ...
4
votes
1answer
110 views

Floating Masses in Gas Giants

This may be a very stupid question, as I know little about astrophysics, but if solids like Aerogel can float in gasses like sodium hexafluoride, could there be pressures high enough on gas giants to ...
6
votes
2answers
162 views

horseshoe orbits

I'm designing a moon system for a fictional setting, and recently came across the idea of horseshoe orbits. The gist of my question is how many objects can share a horseshoe orbital at a time? I ...
9
votes
1answer
1k views

Why does Uranus and Neptune have more methane than Jupiter and Saturn?

So the standard theory of the solar nebula is that in the region of the gas planets, ice and rock could condense to form planetesimals, which could then accrete Hydrogen and Helium to form the gas ...
2
votes
2answers
175 views

Can hot Jupiters cause solar flares?

I'm very new at Astronomy, and my knowledge is sparse. I've tried to be conscientious about my Wikipedia research but there's going to be a lot of things I don't know. Thanks for your patience. ...
2
votes
1answer
950 views

Would a spacecraft just go “through” a gas giant?

From my understanding of the word gas giant, it is a planet composed of entirely a gaseous atmosphere, and so planets Jupiter and onwards fall in this category. That being said, what would stop a ...
2
votes
1answer
124 views

How big are the rocky/icy cores of Jovian planets?

The size of Earth? Or bigger? I'd think they'd have to be pretty big to attract all that gas when the planets were being formed. edit I'm writing a short story and the setting consists of late ...
1
vote
0answers
39 views

What if Jupiter and other gas planets suddenly disappear? [duplicate]

What will happen to us? Jupiter, for example, take away comets from their path, so they will not hit earth. What else can/cannot happen? Have they any purpose for us?
2
votes
2answers
395 views

Which moon has a scar as if it was torn in half and put back together?

When I was a kid I had several beautiful encyclopedias. In one of them there was a description of moon orbiting on of the gas giants that had huge ripples all along its surface. It said in the text ...
2
votes
1answer
49 views

How would tidal effects behave in this setup: An icy moon orbiting a gas giant, as the gas giant orbits a red dwarf? [closed]

Let me know if this is more appropriate for worldbuilding. Essentially, I'd like to know how tidal effects would behave in these circumstances (if it's even stable): An icy moon orbiting a gas ...
3
votes
2answers
520 views

Is there any planet out there which is half gaseous and half rocky ? is this possible?

I have heard many times that this planet is gaseous like jupiter this planet is like super earth like rocky planet etc. so is there any planet which is mix of gase and rock ?
2
votes
1answer
302 views

Could binary gas giants have ring and moon systems?

Would any moons/rings around either of the gas giants stay intact or get ripped apart by the tidal forces between the two giants? If any moons/rings are able to form around either of the giants, is ...
1
vote
1answer
81 views

Can CME destroy planetary rings?

Is Corona Mass Ejection able to reach the outer planets such as Jupiter and Saturn? If so can it blows away the icy rings or the distance is simply beyond the reach of maybe like Earth it is protected ...
9
votes
1answer
127 views

Gas giants and seismology

A long time ago I read a very interesting way of studying the sun's internal structure via sound waves. This new field of study, probability already known here, is called helioseismology. How much ...