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In July 1947 members of the US military reported finding unidentifiable debris in the desert of New Mexico. The only explanation seemed to be that it had come from outer space. Major Jesse Marcel was one of the men who came across the material. In 2010, his son, Jesse Marcel Junior talked to Ed Butler for Witness about the so-called 'Roswell Incident'.

Photo: Major Jesse Marcel with some of the debris in July 1947. Credit: Alamy