> A) Make a solar system with  binary stars
>

Done.

> 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.
>

Done.

> C) Have a planet for each star without colliding.
>

Can't be done.

>
> F) ad a planet that orbits both stars.

Relatively stable system with two planets.  Green's orbit is way too 
wobbly to sustain life, but life on Blue could potentially exist, 
albeit, with Game-Of-Thrones-like seasons that last for years.

http://goo.gl/7D4kG9

 > D) give each planet a moon.

Haven't been successful so far.  Probably because of the limits of the tool.

 >
 > E) change the size of one moon  to be the same size as it's planet so
 > that they become binary planets

Haven't been succesful either.

-- 
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/*    flabreque    */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   gmail.com     */}camera{orthographic location<6,1.25,-6>look_at a }

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