Green Fireball Incidents — Los Alamos

Beginning in late November 1948, a persistent series of brilliantly luminous green fireballs began appearing over New Mexico — concentrating with alarming regularity over the most sensitive nuclear installations in the United States. Los Alamos National Laboratory, Sandia Base, Kirtland Air Force Base, and White Sands Proving Ground all reported sightings. The strategic geography of the phenomena was not lost on Air Force security: these were the sites where the United States designed, assembled, and tested nuclear weapons. The fireballs were initially assumed to be meteors, but this explanation collapsed under expert scrutiny. Dr. Lincoln LaPaz, director of the Institute of Meteoritics at the University of New Mexico and one of the country's leading meteorite authorities, investigated extensively. He found that the objects violated the known physics of meteoric flight in three critical ways: their trajectories were too flat (meteors follow curved descent paths), their speed was too slow for incoming bodies of comparable luminosity, and — most critically — no meteoritic debris was ever recovered despite intensive ground searches. LaPaz publicly stated they were not meteors and that their nature was unknown. Witnesses included USAF pilots, military radar operators, Los Alamos scientists with physics PhDs, and civilian astronomers from the University of New Mexico. The quality of the witness pool was exceptional for any aerial anomaly case of the era. Multiple witnesses observed the objects on consecutive nights, ruling out single-event misidentification. The Air Force response was substantial. Project Twinkle was launched in 1950 specifically to investigate the green fireball phenomenon, deploying scientific instruments at multiple sites to obtain spectrographic data if another fireball occurred. The project ran until 1951 but captured no usable spectrographic data, partly through equipment failures and partly because the fireballs declined in frequency during the observation period. The final Twinkle report, authored by astronomer Dr. J. Allen Hynek who later became the Air Force's primary UFO scientific consultant, was inconclusive. The FBI Field Office in Albuquerque opened its own parallel investigation following a request from Army G-2 intelligence, treating the overflights as a potential foreign espionage threat. No conventional explanation — Soviet probes, atmospheric plasma, St. Elmo's fire — has ever fit the complete dataset. The concentration of the phenomenon over nuclear facilities, combined with the testimony of credentialed scientific witnesses and the formal multi-agency investigation response, makes this one of the most institutionally significant unexplained aerial phenomena series in American Cold War history.