"Stinger" <contact@newsserveronly.com> wrote in message 
news:Jdtzb.1645$MY2.383@bignews6.bellsouth.net:

Bingo.

Yes, they could be easier to notice then the radio transmissions. Even if 
the visitors don't use city lights and haven't any yet: they could think 
it's a weird volcanic phenomenon...
 

"Mr. 4X" <random.zhoan@dbbom.invalid.com> wrote in message
news:Xns9446E4D4A4373mr4x@195.228.240.20...

What about the city lights?