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PostPosted: Mon Jan 06, 2014 9:16 pm 
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Looks like "sub-Neptunes' (or what I call "subgiants" and what 2300AD possibly calls "Failed Cores") are definitely a separate thing from panthalassic/water worlds.
http://www.space.com/24166-mini-neptune ... as223.html

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PostPosted: Tue Jan 07, 2014 12:32 pm 
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What would the atm pressure be like on a world like that?


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PostPosted: Tue Jan 07, 2014 5:06 pm 
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If it's 50/50 hydrogen and helium then the surface pressure would be about 1/10th that of an equivalent thickness of air at Earth's surface. if g is 10 m/s² and the thickness is 1000km and the atmosphere was 50/50 H2/He the surface pressure would only be about 13 atms. Double the thickness, double the atmospheric pressure at the surface.

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PostPosted: Tue Jan 07, 2014 6:44 pm 
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Cool, not unreasonable to get out and walk around.

Hmm, so a very interesting planet. Other than scientific purposes, any reason humans would visit such a planet?

Would be a cool place for an alien race to come from.

Frank


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PostPosted: Wed Jan 08, 2014 2:21 pm 
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I have to admit that from an RPG point of view, I HATE the terms "Super Earth" and "Mini Neptune" (I guess Mini Uranus was too risque?).

I would rather use Failed Core or something like that which is not so humanocentric and more descriptive.

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PostPosted: Sat May 18, 2019 1:42 pm 
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If I'm naughty for resurrecting these threads, let me know, but I only just discovered that Barnard's Star has a confirmed planet, and I bet this is what it is.

About 3.2 Me at a BBT of ~ 106 K

No idea how dense it is, but that deep in the outer zone I would suppose not very. Unless there's a way a rocky world could wander outward.


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PostPosted: Tue May 28, 2019 6:12 pm 
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From the Kepler data there definitely seems to be an overlap within at worlds in the 2-5 Me.

Some are rocky and some are more like gas giants. Two different types of planets within the same mass range. :)

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