About the question of how far a laser beam goes--
NASA left a mirror on the moon- a monster green laser was able to hit that mirror and they could see the laser beam come back to earth(not by eye of course).
This was used in one episode of 'The Big Bang Theory' too--
about sky scanning- doing that could bring unwanted attention to you and, yes, somebody may just feel the urge to 'report' you -- but doing this for me is hard to resist especially on a foggy night. Some nice photos can be made by either moving the beams or moving the camera during a long exposure ( turn off the flash) I have seen some VERY impressive pics taken at dawn with heavy morning fog..
When I get asked ;what good are lasers?'
I often say that having one could possibly save your life when in need of rescue--
That would be one time I would WANT to be reported & btw the new laws regarding lasing aircraft have a clause that makes doing that legal if you are in distress.
I really enjoy a nice camp fire and some rgb lasers-- when there is very little wind you can locate the smoke trail as it rises and lase that-- great time to break out your camera for sure..
BUT it is advised to do such things far from the city and very late at night-