Mercury fireflies became a science problem

These are NASA scientific debriefing transcripts and follow-up analysis memos from 1962 and 1963 covering Mercury astronauts Glenn, Carpenter, Cooper, and Schirra. They focus on the glowing firefly-like particles seen around the spacecraft and on airglow and horizon effects. The memos show NASA doing patient comparison work, sorting which sightings match which physical cause, which is how a famous mystery becomes an ordinary science and engineering problem.

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