Re: [Utah-astronomy] UFO alert!

I want to remind people that unmanned, robotic security/covert surveillance airships have been in service for years. There are probably some working the night skies of most large cities, as well as around military & government installations, private industry facilities, national borders and high-crime areas. Some of these are nearly 50 feet long, and almost completely silent. They are hangared in trailers, and are long gone by daylight. Here is just one example, of a company in the UK: http://www.skyships.co.uk/uavairships.htm