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SpaceEngine Planet Classifications
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| SpaceEngineer | Date: Monday, 29.04.2013, 13:25 | Message # 136 |
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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 # 137 |
 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 # 138 |
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Observer
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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 # 139 |
 Cosmic Curator
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| http://en.spaceengine.org/forum/21-33-4627-16-1335098224
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| Sabratha | Date: Tuesday, 21.05.2013, 02:13 | Message # 140 |
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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 # 141 |
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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 # 142 |
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| Submerged hydrocarbon titan.
Realno...
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| Voekoevaka | Date: Thursday, 06.06.2013, 12:26 | Message # 143 |
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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 # 144 |
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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 # 145 |
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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 # 146 |
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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 # 147 |
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| What about Carbonia ?
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| HarbingerDawn | Date: Thursday, 06.06.2013, 16:52 | Message # 148 |
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| Quote (SpaceEngineer) For me, it sounds like a world full of organic matter, i.e. life.
Well, it is full of organic matter. The problem is that people think of life when they think of organic chemistry, but really terrestrial biochemistry is mostly just a subset of organic chemistry.
For "ice giants", people thought of ice, i.e. solid H2O like we find on the surface of Earth and other worlds, but that's not what it really means, it has a different scientific meaning in the context of planetary astronomy, so we use that name. The same with oceanias; we think of them as worlds covered in liquid water like Earth's oceans, and they are rendered as such, but in reality many of them are like miniature ice giants. So we continue to use the name despite some people being confused.
Likewise, I think that organia could be used here. Even though many people will think of life, the fact remains that organic just means various carbon compounds, and anyway SE has the "with life" modifier so people can not be confused about whether there is life there.
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| midtskogen | Date: Thursday, 06.06.2013, 18:46 | Message # 149 |
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| In line with the existing naming system wouldn't "hydrocarbon oceania" work? Which also might be an opportunity to replace the titan name with "hydrocarbon terra". While I'm not too fond of the "terra" name, I like "titan" less. 
NIL DIFFICILE VOLENTI
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| HarbingerDawn | Date: Thursday, 06.06.2013, 18:48 | Message # 150 |
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| We should not use the name of one class of world in the name of another.
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