The spot appeared to move quickly from frame to frame, and the engineer thought it looked enough like some sort of craft to notify the Chilean government agency in charge of investigating anomalous aerial phenomena, known by the Spanish acronym CEFAA.

The way Kean tells it, CEFAA investigators looked around for other video clips of the event and pieced together six additional views of the spot-shaped phenomena. Ricardo Bermudez, a retired Chilean Air Force general who is now CEFAA’s director, told a UFO conference last month that his agency consulted with other officials, image-processing experts and “non-believer astronomers.” CEFAA’s conclusion was that the spots were caused by an object traveling through the scene at speeds in excess of 4,000 mph — so fast that it went unnoticed by air-show spectators.

“Humans inside this object could not survive,” Kean and a co-author, former New York Times investigative reporter Ralph Blumenthal, wrote in a Huffington Post report appearing on Tuesday. “And, somehow, it made no sonic boom…”