Farmers in Roswell, New Mexico discovered strange metal debris in a field in 1947 after reports of a glowing object in the sky. The local sheriff collected pieces of the unusual grey metal that was stronger than typical metals and had strange symbols. An officer from a nearby air base believed the metal came from a UFO rather than an airplane as the sheriff suspected. The military later claimed the debris was from a weather balloon, but the incident sparked ongoing debate and conspiracy theories about whether aliens visited Roswell.