| SpaceEngine Planet Classifications |
| NovaSilisko | Date: Monday, 29.04.2013, 09:42 | Message # 136 |
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| Quote (SpaceEngineer) According to modern models, Neptune have an ocean, and Uranus have a solid surface (not rocky, but icy).
Care to elaborate? I've never heard anything about this. Seems like finding out two of the gas giants aren't actually gas giants would be pretty big news.
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| apenpaap | Date: Monday, 29.04.2013, 10:57 | Message # 137 |
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| I read that too; it makes their naming after the gods of sea and sky rather approppriate. But they are still gas giants (well, ice giants): Uranus' surface lies all the way at the core, and the main part of the planet is its enormous atmosphere. In Neptune's case, its ocean also lies very deep (about an Earth diameter under the clouds) and is composed of water, ammonia, and methane. The main difference with the "oceans" of Jupiter and Saturn is that those are mainly composed of hydrogen and helium (like the rest of the planet) under such great pressure they go liquid, while Neptune's ocean is composed of volatiles while most of its helium and pure hydrogen is in its atmosphere.
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| kairunotabi | Date: Monday, 29.04.2013, 11:00 | Message # 138 |
 Astronaut
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| Quote (Voekoevaka) This seemed to be the definition of a rogue planet (planemo). I think this kind of planet don't necessary need an entire type ; you can just class it by "frozen gas giant".
In my case, I deal with planets we can find in all systems, which are enough big to harbor a gasgiant-like atmosphère, but which are enough small to have an ocean and a rocky surface.
It's the definition/meaning of the word Maelnia, i just made up the word for you
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| SpaceEngineer | Date: Monday, 29.04.2013, 13:25 | Message # 139 |
 Author of Space Engine
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Russian Federation
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| Quote (apenpaap) and the main part of the planet is its enormous atmosphere.
No. H-He atmosphere of ice giant is only 15-20% of planet's mass. Main part is a huge core made of ices of water, ammonia, methane and other volatiles. In the center of icy core there may be rocky or rocky + metallic core. Icy layer may be extremely hot (thousands of degrees), but be still solid due to crashing pressure (so it still called "ice"). Upper part of it may be liquid (like on Neptune), and this ocean may smoothly transit into dense atmosphere with no visible surface.
Gas giants by definition have a layer of metalic hygrogen. Presence of metalic hydrogen is a boundary for classification of a planet. They may still be composed as ice giants, with huge part of ices, and/or have much, more massive H-He atmosphere (up to 90%). Of course, this classification is good and physically based, but in reality we cannot detect the metalic hydrogen layer directly (and I can't imagine the probe that would be able to reach the metalic hydrogen layer), so we must use other parameters to determine for which class the planet belongs. Good parameter is mass - metalic hydrogen layer start to forming in hydrogen-rich planets at masses approx 50-60 Earth masses. And planets with such mass must be hydrogen rich.
On another side, from low masses, ice gints are smoothly transits into oceanias or "hypertitans" - large icy planet with dense atmosphere. This boundary not yet determined good, and assumed to be at 7-10 Earth's mass. With mass of 14 and 17 Earth's mass, Uranus and Neptune are closer to this boundary than to gas giants boundary.
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| NovaSilisko | Date: Monday, 29.04.2013, 20:39 | Message # 140 |
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Explorer
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| Quote (SpaceEngineer) Upper part of it may be liquid (like on Neptune), and this ocean may smoothly transit into dense atmosphere with no visible surface.
Ah, okay. I thought you meant it was literally an Oceania sort of planet with an actual ocean surface.
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| Sabratha | Date: Tuesday, 21.05.2013, 02:10 | Message # 141 |
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Observer
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Poland
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| Well, I have to admitt that I'm not a geologist or physicist and I was just wondering...
In SE I came across a hot oceanic planet, with a temperature of 642.69 kelvin (369.54 celsius) - Delta2 Lyrae system, first planet.
So I was wondering, what could said ocean be actually made of? Liquid potassium? Liquid cessium? Liquid lead? Liquid Sulfur?
I'd wager on liquid sulphur being the most probable, but as I said... I'm no specialist here. Thus I was wondering if anyone here has any insight on how such a planet would function? What would such an ocean be made of? Can it support life? (my wildest shot at thsi would be sulphur based life, but I admitt its a pretty mad theory).
Edited by Sabratha - Tuesday, 21.05.2013, 02:12 |
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| HarbingerDawn | Date: Tuesday, 21.05.2013, 02:12 | Message # 142 |
 Cosmic Curator
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| http://en.spaceengine.org/forum/21-33-4627-16-1335098224
All forum users, please read this!
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| Sabratha | Date: Tuesday, 21.05.2013, 02:13 | Message # 143 |
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| Quote (HarbingerDawn) http://en.spaceengine.org/forum/21-33-4627-16-1335098224
Woo thanks for the speedy response 
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| SpaceEngineer | Date: Thursday, 06.06.2013, 12:11 | Message # 144 |
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Author of Space Engine
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| SE requires a new class of planets - titans fully covered with liquid hydrocarbons ocean. Hard to choose a name for this class.
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| boyan3001 | Date: Thursday, 06.06.2013, 12:16 | Message # 145 |
 Astronaut
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Serbia
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| Submerged hydrocarbon titan.
Realno...
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| Voekoevaka | Date: Thursday, 06.06.2013, 12:26 | Message # 146 |
 World Builder
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| Methania. I saw this name in a dream I made and it sounds good.
http://en.spaceengine.org/forum/21-33-23993-16-1367190678
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Edited by Voekoevaka - Thursday, 06.06.2013, 12:27 |
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| HarbingerDawn | Date: Thursday, 06.06.2013, 12:38 | Message # 147 |
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Cosmic Curator
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| Quote (boyan3001) Submerged hydrocarbon titan.
So oceanias could be called submerged water terras? It needs to me something more concise.
Quote (SpaceEngineer) SE requires a new class of planets - titans fully covered with liquid hydrocarbons ocean. Hard to choose a name for this class.
I propose organia, organicia (with a soft c), or carbomare, organimare. Something along that line of reasoning.
Quote (Voekoevaka) Methania
I thought of this too, and it would be perfect except that the ocean would not always (or even often) be entirely methane. In the case of Titan it is a mixture of methane and ethane, possibly with much more ethane than methane.
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| Voekoevaka | Date: Thursday, 06.06.2013, 13:19 | Message # 148 |
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| I like organia too, as it is the equivalent of methania for all types of hydrocarbons.
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| SpaceEngineer | Date: Thursday, 06.06.2013, 15:19 | Message # 149 |
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| Quote (Voekoevaka) I like organia too, as it is the equivalent of methania for all types of hydrocarbons.
For me, it sounds like a world full of organic matter, i.e. life.
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| Voekoevaka | Date: Thursday, 06.06.2013, 15:29 | Message # 150 |
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World Builder
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| What about Carbonia ?
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