mamgnemoe

The problem is tides as explained, stuff left in Moon orbit will stay for some years and then either fall down or end up in earth orbit. In KSP this is not an problem as the game don't use tidal forces. You can also put an satellite in orbit around the moon, however an sub moon has to stay in orbit for millions of years or we would probably not see it.

Mine got deleted, worse then I re-registered I managed to type the username wrong. Was not allowed to change it so i had to. 1) change the email on my misspelled account to my work email as you must have unique emails for accounts. 2) register again, however as I did not get any confirmation email on the correct named account so I can not use it.