UFOs are mapping the surface of the Earth as they create a Google Map-style chart of the Universe.
Former military intelligence adviser Christopher Mellon claims thousands of similar sightings worldwide suggest alien craft are on a “reconnaissance mission”.
The expert, who served under Presidents Bill Clinton and George W. Bush as US Deputy Assistant Secretary of Defence for Intelligence, drops his bombshell conclusion in a new TV documentary due to air in the UK next month.
It comes at the same time as a Senate committee voted to compel the Pentagon’s own UFO research unit to declassify many of its findings next year and make them public.
Mr Mellon said: “I don’t think these things are ours and I’m hopeful we can finally make headway in discovering where they might be coming from and how they work.”
The ex-Pentagon boss added: “If they’re not ours, we have a lot to worry about. They could spell a new and uncertain security threat.”
He reveals his latest research in an upcoming episode of Sky History series Unidentified: Inside America’s UFO Investigation, the second season of which launches on September 1.
It includes footage of several huge objects shaped like perfect equilateral triangles which have lights on each of their three corners and appear capable of slowly drifting across the sky as well as departing with incredible bursts of speed.
These triangular craft have now been seen above more than 50 US military installations, including Scott Air Force Base, Illinois – a strategic command centre whose state-of-the-art equipment failed to even register the “intruder.”
Mr Mellon said this type of UFO bears “absolutely no resemblance” to any advanced Earthly air technology such as stealth bombers or modern fighter jets but has been seen around the world “for more than 40 years”.
He believes that the craft would be capable of highly detailed mapping of the surface below, accounting for well-documented periods of extremely slow progress through the sky.