Science fiction and fantasy dramas like Doctor Who and Torchwood may be behind a rise in UFO sightings in built up areas of Wales, an expert has said.
Nick Pope, the Ministry of Defence's (MoD) former UFO project head, was commenting on figures released by the MoD which show sightings have gone up.
He said other sightings reflected the growing popularity of Chinese lanterns.
In 2006, 97 UFOs were reported across the UK. This rose to 135 in 2007 and 285 in 2008, with 18 Wales sightings.
These sightings in Wales included bright white objects over Anglesey, black disc shaped objects in the skies over Neath Port Talbot, objects moving like a football over Pontypridd and a UFO in Old Colwyn, Conwy, which was "bigger than a helicopter".
Mr Pope, who continues his research into the phenomena of UFOs on a private basis, said he believed the revitalisation of the Doctor Who franchise had made people more open to seeing UFOs.
"If I am being cynical, maybe Doctor Who and Torchwood being filmed in Cardiff and the surrounding area might make people look to the skies more than they would previously," he said.
"There have been quite a few sightings in Cardiff, Barry, Swansea and other built up areas in the south of the country.
"Traditionally people think of UFO sightings as taking place in a deserted and dark part of the countryside but many of the Wales sightings are from cities and towns."