Thanks
Moogs - I never knew that was how our moon started! Freaky!
Were you an astronomy kid at school - where did you pick up this knowledge? I'm really just learning all this stuff from checking out this thread.
Oh well, better late than never!
(I guess space and astronomy were never major points of fascination for me as a kid - my loss evidently. 
I'm really intrigued by the grandeur and enormity of this exploration and research into our solar system!)