Apollo 16's flashes

Apollo 16 flew in April 1972 and Ken Mattingly stayed in lunar orbit in the command module while John Young and Charlie Duke worked on the surface. The archive's telling has Mattingly repeatedly seeing flashes of light on the lunar surface below him. Seismometers left by earlier crews detected no meteor impacts that could explain them. A photograph, the telling says, showed a shadow racing across the surface and a flash from a crater as an unidentified object passed overhead, and no official explanation was ever produced. A second telling, from a separate video that covers the Apollo 16 and 17 flashes together and is now merged into this case, adds Harrison Schmitt and Farouk al-Baz and says a recent NASA paper confirmed the flashes had no matching seismometer activity, so they cannot be put down to asteroid strikes.

What is on the record

Three claimants, Ken Mattingly, Harrison Schmitt and Farouk al-Baz, resolve from two videos on a single channel. Only Mattingly flew on Apollo 16. Schmitt counts for a flash of his own on Apollo 17, eight months later, and the tellings name al-Baz without saying what he saw or in what capacity. One document is now in the file. It is NASA's Apollo 16 Scientific Debriefing, NASA-UAP-D024, carried in the Pentagon's UAP record releases. In it the principal investigators brief the crews on early results ahead of Apollo 17 and describe anomalies, among them a flash that had been observed and not yet reported. The photograph of a shadow and a crater flash is still described but not produced.

Outside the archive's holdings the flashes have an explanation of record and it sits at odds with the telling. Astronauts on every Apollo flight from 11 onwards reported flashes and streaks of light in the dark, and NASA flew a helmet-shaped emulsion detector on Apollo 16 and 17 to catch the cause. The 1974 paper in Science attributed them to heavy cosmic-ray nuclei passing through the eye: phosphenes rather than light from the Moon. On Apollo 16 the crewman who all but never reported them was Mattingly, who said he had poor night vision, while Duke's session ran to about seventy. Mattingly did report one flash on the Moon itself. On 21 April 1972, about 123 hours into the flight, he told the onboard recorder he had seen a bright flash below the horizon and wondered aloud whether it was one of the eye flashes the others had been seeing all day. That single report, not a series, is what NASA's preliminary science report carries. Separately, Schmitt on Apollo 17 radioed that he had seen a flash on the surface north of Grimaldi and asked whether the seismometers had anything, and Ron Evans reported a third the next day over Mare Orientale. A preprint posted in February 2026 by Benjamin Fernando and colleagues, with authors at NASA Goddard and NASA Ames and Schmitt himself among them, checked all three against the Apollo seismic network and found no matching signal. That is the nearest thing to the recent paper the second telling cites, though it is a university-led preprint rather than a NASA publication, and it reads the flashes as meteoroid strikes too small for the seismometers rather than as a mystery. The archive has not found a public record of the shadow photograph. Impact flashes on the Moon are real; whether any Apollo crew saw one from orbit is the open part.

Why it sits where it does

L4 records named claimants paired with an official record, here the Apollo 16 debriefing, and it says nothing about which explanation is right. The sourcing is two videos from one channel, and the event they connect is really two flights. What the crew saw is a matter of record with two candidate answers, in the eye and on the ground. Which it was is not resolved here.