Trancas encounter, Tucumán
Women at the Moreno family farm near Trancas said several lit craft landed by the railway at night and shone beams at the house.
1963 CE · -26.23, -65.28 · status: account
The account
On the night of 21 October 1963 the sisters Argentina Moreno de Chávez and Yolie Moreno de Colotti and the household worker Dora Martín Guzmán reported strong lights in the yard and on the nearby rail line, which turned out to be several glowing objects; one, they said, sent a beam that heated the house. White powdery residue found afterwards was analysed at the National University of Tucumán and found to be mostly calcium carbonate. The case was reported in Argentine and European newspapers within days.
The sceptical view
Army troop trains were running on the line that week for exercises, which may account for some lights. The residue was ordinary chemistry, and the witnesses' accounts differ on the date and details.