But, UK UFO expert Nigel Watson, author of the UFO Investigations Manual, believes he knows what is causing the crop in sightings - and it is from outer space.
Venus has been visible in the night sky since the start of the new year and he believes it is the planet which is behind the huge rise in claims.
Mr Watson said: "The latest crop of UFO videos in the UK and Europe might well be due to the current brightness and visibility of Venus in our night skies.
"It not only looks strange to human observers but when videoed can appear even odder due to lens reflections, autofocusing and the motion of the camera that can give the illusion a stationary object is darting about."
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