Although I doubt anyone's reading it by now, but in answer to #3, cave12man, the Moon *does* have an atmosphere, it's just paper thin. http://en.wikipedia.org/wiki/Atmosphere_of_the_Moon
(it also has a sodium tail) http://en.wikipedia.org/wiki/Sodium_tail_of_the_Moon
(it also has a sodium tail)
http://en.wikipedia.org/wiki/Sodium_tail_of_the_Moon