Gee, this is getting too serious...
Considering the fact that no one had ever done any archaeological digs on the Moon
in Middle-Earth, won't it be better to keep an open mind about myths and whatnots? I believe that J.R.R.T meant literally that the Moon is really a space-Maia(TM) running after another space-Maia.
But Hobbits clearly had another concept about the Moon.
Perhaps after a few Ages (this being pro'lly the Seventh), Ol' Tirion had become a fossilised lump of space junk. And Arien grew to become the overweight, grumpy ball of flame due to inattention from her only mate in space...
Oh yes, Morgoth could probably be an Earth-sized Comet by now...