This document is a NASA debriefing transcript, dated June 16, 1966, of Gemini IX-A astronauts Thomas Stafford and Eugene Cernan. The mission, launched June 3, 1966, included a spacewalk and various scientific and medical experiments. In the transcript the astronauts described observing "flashing lights" and "sparkles" during the flight.
Gemini IX, later renamed Gemini IX-A, was the seventh crewed flight in the Gemini series and launched on June 3, 1966. Its primary objectives included a spacewalk along with multiple scientific and medical experiments.
This NASA document, dated June 16, 1966, transcribes a debriefing of astronauts Thomas Stafford and Eugene Cernan. On pages 2-5, the astronauts recounted observing "flashing lights" and "sparkles" during the mission. The record was released through the PURSUE declassification.