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January 4
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Current depictions of the Birrin world show it with two moons, one large and one small. However current research I can find suggests multiple moons around an earth sized planet are inherently unstable.

Does anyone have any knowledge of a way a multiple moon system could work?

If not, I will be reducing the Birrin world to a single-moon planet like earth.
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:icongatemonger:
gatemonger Featured By Owner Jan 16, 2014
Is it possible for a moon to have its own satellite?
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 17, 2014
It seems that it only can for a while, before it becomes tidally locked and simply crashes into the bigger moon.
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:icondanirevan:
DaniRevan Featured By Owner Jan 13, 2014
I didn't realize multimoons around a Earth-sized world were unstable...

Wait...does this apply possibly to super-Earths too? Or just "earth sized"?

Because this may not be plausible anymore: danirevan.deviantart.com/art/2…
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 17, 2014
Yeah I am thinking that super earths might be able to carry other possible configurations for longer, though I dont think anyone truly knows for sure.

My research indicated that your system would be unstable, but the moon may stay there for many years before crashing into the moon or the planet, since there is now a theory earth had two moons for a time before they combined.
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:icondanirevan:
DaniRevan Featured By Owner Jan 17, 2014
Thank you for your insight.

The moons, I forgot to mention earlier, are in 2:1 resonance. Would that stabilize them, or is it just impossible?
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 19, 2014
Sadly I just dont have the expertise, so I decided to err on the side of caution. I think the problem is the resonance isnt clean, because of the sun and other planet's influence.
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:icondanirevan:
DaniRevan Featured By Owner Jan 19, 2014
Sorry about a 3rd post, but then that would mean the Jovian moon resonance isn't clean either? Or is there a factor that keeps them in a stable resonance?
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 20, 2014
The moons around Jupiter I believe are kept in place because of the sheer mass of the planet.
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:iconfeaturelessmask:
FeaturelessMask Featured By Owner Jan 9, 2014
I know this comes to late but there pare some cool physicists who hang out on /r/worldbuilding.
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:iconblazr-san:
BLAZR-SAN Featured By Owner Jan 8, 2014
Two words Abio': Orbital Resonance; look it up online and study it attentively - it's a bit complex when you get down to it, but you'll get the whole concept. Just think of the Galilean moons, Pluto or Neptune, and so on; you should know these spheres (and their satellites) I would believe.

From there, scale them, give them life forms, sufficient gases needed to support life, sustainable atmospheric layers, and unique-but-realistically-based functions and voila! Nascent moons for the Birrin Sphere!!
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