Vaise on a serious note, if indeed there are Aliens & they have technologies to travel thousands of light years,they can easily stay 'invisible' or atleast navigate their way around without turning on the 'headlights' as seen in some alleged UFO clippings.
wht I beleive is tht these have been created by the developed countries...bcoz there have been no UFo sightings over the third world countries...so dont u thnk these UFOs are nothing but devices to spy over other countries???