Word: flashbulbs
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Dates: during 1971-1971
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...that have been reported by spacemen on previous voyages. Scientists believe high-energy cosmic rays impacting on the eye's retina or the brain's optical center cause the flashes. During the hour-long test, the astronauts reported seeing a total of 61 flashes, which Scott compared to a flashbulb's popping in a darkened arena...