Documented sightings reported in 1957.
At least 15 independent witnesses near Levelland, TX reported a glowing object that killed vehicle engines and headlights at close range.
Brazilian farmer Antônio Villas Boas reported the first widely-documented modern abduction case - including a medical exam and a sexual encounter - in October 1957, four years before Betty and Barney Hill.
Anonymous fragments allegedly recovered from an exploding UFO off Brazil's São Paulo coast were tested at multiple labs and found to be 99.9%-pure magnesium - one of the longest-running physical-evidence cases in UFO history.
A USAF RB-47 reconnaissance bomber tracked an object on radar, electronic countermeasures, and visually for 700+ miles across multiple states.