The truth is out there? Billy Meier's UFO images up for auction
(c)BBC '19illy Meier is a Swiss national who in the 1970s claimed he had been in contact with aliens from the Pleiades star cluster - and had photographs to prove it.
Published in a 1979 book by former United States Air Force pilot Wendelle C Stevens, they later appeared in publicity material for US science-fiction programme The X-Files.
Now, they are up for auction at Sotheby's in the US, as part of a sale dedicated to space photography.