Am 25.08.2014 21:24, schrieb Nekar Xenos:
> A) Make a solar system with  binary stars
>
> B) Make the binary stars orbit around each other so that the trajectory
> looks like intersecting circles of the same size, yet the stars should
> never collide.
>
> C) Have a planet for each star without colliding.
>
> D) give each planet a moon.
>
> E) change the size of one moon  to be the same size as it's planet so
> that they become binary planets
>
> F) ad a planet that orbits both stars.
>
> :)
>


Here's a good example of why that's more difficult than it may appear at 
first:

http://goo.gl/8oj291

At first it seems that the system settles into a very neat routine: 
While a pair of two heavy central bodies tumbles closely around each 
other, a lighter third body circles it at a considerable distance, with 
some precession but otherwise unremarkable. After a while the third 
body's trajectory will become uneasy for a brief time, then settle again 
into a more excentric but seemingly more stable orbit, ceasing its 
precession.

But the peace is a treacherous one: Very suddenly, momentum will begin 
to transfer from the inner planets to the outer one, drastically 
increasing its orbital period and excentricity; within a matter of just 
a dozen orbits it will start going off screen, until it spends maybe a 
minute or so off screen at a time. Another dozen revolutions later the 
orbital period and excentricity will start to decrease again, but will 
never shrink again to fit inside the screen, and only a handful of 
revolutions later the planet picks up speed again, this time to go for good.

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