Jérôme M. Berger nous illumina en ce 2009-01-07 15:13 -->
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> clipka wrote:
>> David Buck <dav### [at] simberoncom> wrote:
>>>   It was for a science fiction story I was working on that takes place
>>> on a planet that orbits a star 20 lightyears away.  This is actually a
>>> binary planet where two approximately equal mass planets orbit each
>>> other (or around the center of mass of the two planets) and both orbit
>>> the star.  The two planets are tidally locked to each other.  I wanted
>>> to discover the dynamics of this world.
>> Out of curiosity: Would such a system actually be stable in reality?
>>
> 	It is: look at the Pluto-Charo pair of planets (planetoids?) in the
> solar system.
> 
> 		Jerome
> 
> PS: Of course, Pluto and Charo aren't 20 ligth-years away from their
> sun, but that's probably just me being obtuse ;)
> 
> 
It's 20 lightyears away from HERE.

A planet orbiting it's sun at a 20 lightyears radius would need to have an 
extra-galactic sun, or get snatched away by nearby stars. Such a planet would 
also be frozen solid, with, maybe, sone seas of liguid hydrogen and helium. It's 
"year" would last several 100's of millenias.


-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when your source files are starting to 
get bigger than the image files.
     -- Matt

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