A flying object is seen on Vancouver Island, British Columbia in this October 8, 1981 photo. In May 2006, the British Ministry of Defence made public a top secret report on UFOs, concluding that three decades of sightings had failed to produce evidence of visiting extraterrestrials
An aerial view shows circles created in a grain field near the north Czech town of Liberec, 110km (70 miles) north of Prague, in this picture taken from a remote helicopter June 30, 2008. The origin of the circles remains unknown.
Original titles: Aliens are already on the earth, Bulgarian scientists claim
Photos: Xinhua/Reuters File Photo
Editor: Rob Welham
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