Talk:Giant planet

modified paragraph

I modified this paragraph beyond recognition:

Many of the extrasolar planets which have been discovered have masses of several times Jupiter's mass, and on the basis of this it has been suggested that these may be gas giants. However, it is important to note that the detection techniques that have been used to identify extrasolar planets so far (detecting doppler shift in the star's spectrum due to the wobble induced by the planet's orbit) are much more adept at detecting giant planets than smaller ones and therefore this sample may be biased. In addition, with a few exceptions, the actual composition and structure of extrasolar planets have not been observed and many of the extrasolar planets are much closer to their parent stars and hence much hotter than gas giants in the solar system, making it possible that some of those planets are a type not observed in the solar system.

I think the new version is better, but ymmv. Mark Foskey

This article could be clearer about the difference between gas giants and brown dwarves. The latter article says: "Density is a clear giveaway. Brown dwarfs are all about the same radius and volume; so anything that size with over 10 Jupiter masses is unlikely to be a planet" while this article says gas giants are planets and can exist up to ~70 Jupiter masses. Horatio 12:09, 30 July 2005 (UTC)

Merge with Sudarsky classification system

I created the Sudarsky classification system article, however on reflection I feel that giving it an entire article gives too much weight to a theoretical classification system for which very little observational data exists to back it up. Also, the existence of the article seems to be giving the impression that Extrasolar Visions-style speculations should be applied to every extrasolar system in existence. I feel that this system of predicting the appearance of extrasolar gas giant planets would be better as a subsection of this article. Chaos syndrome 22:53, 14 January 2006 (UTC)

• OBJECT I don't think Sudarsky is prevalent enough to merge into here, besides, it'd clutter the article alot. Zzzzzzzzzzz 03:02, 24 January 2006 (UTC)

There seem to be a lot of objection responses to this one, I'll retract the merger suggestion. Chaos syndrome 10:53, 26 January 2006 (UTC)

Liquid Helium???

The article has gotten long and I do not want to jump in while it is changing in so many places, but I feel that this statement: "the name is defensible because their compositions are dominated by hydrogen and helium, which are gases in the outer solar system when not under pressure." is misleading. Helium will be in gaseous state anywhere in these planets, I believe, because it has to be cooled so much to liquefy. I also thought hydrogen could be in a metalllic state in Jupiter (helping explain the magnetic field). So I think "gas giants" refers mainly to the paucity of rock. Carrionluggage 17:43, 10 February 2006 (UTC)

Hi, I created that sentence, but I was just copyediting for clarity and have no scientific background, so if you think it's wrong you should change it. The Singing Badger 18:34, 10 February 2006 (UTC)

OK - I fixed it so it is correct, but the section is much too long now and refers to "misnomer" or a synonymous phraseology twice. It might have been OK as it was before - do not know why S.B. changed it. By the way, I linked in a page that briefly discusses "critical point" because the Wikipedia page Phases_of_matter containing critical phenomena is quite verbose, with too much in it, and the phase diagram showing a critical point is way down the page.Carrionluggage 04:53, 11 February 2006 (UTC)

Mass gap?

"Interestingly there appears to be a mass gap between the heaviest gas giant planets detected (about 10 times the mass of Jupiter) and the lightest red dwarfs." - is there? The missing objects would presumably be brown dwarfs, of which we now know a fair few. And there doesn't seem to be much of a gap between the brown dwarfs and large planets either - OTS 44 and Cha 110913-773444 seem to bridge the gap between planets and brown dwarfs. Am I missing something or is the article statement now outdated? Chaos syndrome 22:44, 13 March 2006 (UTC)

Floating cities

I wonder who put the "floating cities" in the "See also"--Spaceman 09:23, 30 June 2006 (UTC)

To scale or not to scale?

There are two pictures in the article, one "to scale" the other "not to scale". Yet both have pretty much the same relative sizes of the 4 planets. Maybe they are both "to scale"?--345Kai 22:09, 24 August 2006 (UTC)

Moons

I noticed there is a small comment about moons in the article, but perhaps we should elaborate. Maybe we should discuss the debris cloud that surrounds the gas giants when they are being formed and how the cloud matter can build moons and rings.

Ice Giant

The scientific community has adopted the term "ice giant" to describe Uranus and Neptune, since they differ in both composition and evolution from their fellow giant planets Jupiter and Saturn. This term is quickly gaining common usage; a separate article should be established for Ice Giant, preferably written by someone within the astrophysics field, and the link for such should no longer redirect to this page.PJtP 21:58, 18 January 2007 (UTC)

If this article is renamed giant planet, and gas giant and ice giant are broken out as separate articles... 132.205.44.134 22:47, 25 April 2007 (UTC)

Uranus and Neptune

Is Uranus really the most foul smelling gas giant?Astroman1111 11:52, 11 August 2007 (UTC)

What causes the atmospheric banding exactly?

I have ascribed this to tidal force for the time being - rapid rotation does not explain it fully. It makes sense given that Jupiter has extremely turbulent bands (closest to the sun) while Uranus has very weak banding. I do not understand exactly how tidal forces can account for this at the mechanical level, but it seems reasonable. Comment please, and perhaps we can get some citations for it.--ChrisJMoor 00:50, 16 September 2007 (UTC)

Thank you for trying to improve Wikipedia. Unfortunately, ascribing the banding on Jupiter to tidal forces based on it seeming reasonable is original research. The bands are caused by a combination of the Coriolis force and convection, the same mechanism that produces the jet streams and trade winds on Earth. Neitherday 05:02, 16 September 2007 (UTC)

Discovery

Asking for a bit of info I've never been able to find anywhere: When was Jupiter found to be a gaseous planet? this page was created by marysa--88.149.232.208 22:18, 24 October 2007 (UTC)

Gas planet size

Technical question: Allowing for variations in gas-mixture composition (ie relative quantities of hydrogen, helium, methane "and all other possible components") what is the smallest size a gas giant could be and be persistant on an astronomical scale? Jackiespeel (talk) 17:16, 29 July 2008 (UTC)

Do you mean geometrical size, or mass of a planet? Sometimes people say "size", but actually mean mass. Ruslik (talk) 18:36, 29 July 2008 (UTC)

"Either or both" (as can be relevant). Will "proximity to star being orbited" be a factor?

A suitable link would suffice. Jackiespeel (talk) 15:47, 30 July 2008 (UTC)

The Color Spectrum Seen in the Jovian Planets

Has anyone ever noticed that the color of the Jovian planets rougly matches the color spectrum: 1. Red - Jupiter is somewhat reddish/orangish/brownish, especially towards the middle. 2. Yellow - Saturn is yellowish/tanish. 3. Green - Uranus is greenish-blue. 4. Blue - Neptune is deep blue.

Augustus Alyosius Amadeus Ambrosius duGracie III (talk) 20:44, 7 October 2008 (UTC)

Question

If you throw a thermonuclear bomb at a gas giant, will it initiate a chain reaction and blow the planet up?